Biochemistry-Physiology 2

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Biochemistry-Physiology 2
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Biochemistry Physiology 1985
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Biochemistry-Physiology 1985
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  1. The km value of an enzyme is numerically equal to 
    1. Half the maximum velocity expressed in. moles/liter
    2. Velocity of a reaction divided by substrate concentration
    3. Substrate concentration in moles/liter necessary to achieve half the maximum velocity of a reaction
    4. Maximum velocity divided by half the substrate concentration in moles necessary to achieve maximum velocity
    3. Substrate concentration in moles/liter necessary to achieve half the maximum velocity of a reaction
  2. The physiologically active form of vitamin D produced in the kidney is
    1. 1,25-dihydroxycholecalciferol
    2. 25-hydroxycholecalciferol
    3. 7-dehydrocholesterol
    4. Cholecalciferol
    5. Ergosterol
    1. 1,25-dihydroxycholecalciferol
  3. Which of the following is an example of reduction?
    1. -CH = CH- + H2O→ -CH2 - CHOH-
    2. R-COOH → R-COO- + H +

    3. -CH2 CH2 → -CH - + H2

    4. Cu + → Cu+2 + e-

    5. Fe+3 + e → Fe +2
    5. Fe+3 + e → Fe +2
  4. The ketone body acetoacetate is synthesized inside mitochondria of hepatocytes by
    1. Carb oxidation of pyruvic acid
    2. Transamination of aspartame acid 
    3. Cleavage of B-hydroxy-B-methylglutaryl CoA
    4. Oxidative decarboxylation of a-ketoglutarate
    5. Oxidation of L-B-hydroxybutyrate followed by deacylation
    3. Cleavage of B-hydroxy-B-methylglutaryl CoA
  5. Acids found in the citric acid (Krebs) cycle are
    1. Glutamic acid and succinct acid
    2. Glucoronic acid and aspartame acid
    3. Oxaloacetic acid and aspartame acid
    4. Oxaloacetic acid and pyruvic acid
    5. Oxaloacetic acid and a-ketoglutaric acid
    5. Oxaloacetic acid and a-ketoglutaric acid
  6. The presence of glucose in the urine proves that patient the has
    1. Diabetes mellitus
    2. Negative nitrogen balance
    3. Exceeded his renal threshold for glucose
    4. Excessive damage to a glomerulus of the kidney
    3. Exceeded his renal threshold for glucose
  7. Carbonic anhydrase in kidney tubular cells is associated with reabsorption of 
    1. Urea
    2. Chloride
    3. Carbohydrate
    4. Bicarbonate ion
    4. Bicarbonate ion
  8. An impulse can travel from one nerve to another in only one direction because the
    1. Synapse limits the direction of travel
    2. Myelin sheath limits the direction of travel
    3. Myoneural junction limits the direction of travel
    4. Nerve fiber permits conduction in only one direction
    5. Cell body must be stimulated before the nerve fiber will conduct
    5. Cell body must be stimulated before the nerve fiber will conduct
  9. The intracellular second messenger for many peptide and polypeptide hormone is
    1. AMP
    2. ATP
    3. Cyclic AMP
    4. Adenylate cyclase
    5. A cytoplasmic receptor
    3. Cyclic AMP
  10. Human parotid saliva is believed to be hypos molar because
    1. Water is reabsorbed by excretory ducts of the gland 
    2. Acinar cells transport water more readily than sodium ions
    3. Striated duct cells produce excess water and retain potassium
    4. Reabsorption of water by striated duct cells is less than reabsorption of sodium
    4. Reabsorption of water by striated duct cells is less than reabsorption of sodium
  11. Which of the following is the major contributor to colloid osmotic pressure?
    1. Albumin
    2. Alpha globulin
    3. Beta globulin
    4. Gamma globulin
    1. Albumin
  12. The dominant factor controlling absorption of iron from the gastrointestinal tract is
    1. Excretion of iron in the urine
    2. Excretion of iron in the stools
    3. Saturation of mucosal cells with iron
    4. Concentration of the ferrous iron in bone marrow, spleen and liver
    3. Saturation of mucosal cells with iron
  13. Spatial summation results from the
    1. Convergence of several afferent impulses on the same post synaptic nerve soma
    2. Repetitive firing of discharges (from the same presynaptic terminal), eventually producing an action potential
    3. Exhaustion of the stores of transmitter substance at the synapse
    4. Elaboration of some inhibitory substance, such as y-aminobutyric acid, at the synapse
    4. Elaboration of some inhibitory substance, such as y-aminobutyric acid, at the synapse
  14. Two atoms are considered isotopic if
    1. Their nuclei contain the same number of neutrons
    2. Their atomic numbers are the same, but their mass numbers differ
    3. Their mass numbers are the same, but their atomic numbers differ
    4. One is beta emitter, and the other an alpha emitter
    2. Their atomic numbers are the same, but their mass numbers differ
  15. The distribution of carbonate within dental enamel follows the same surface. To Dentinoenamel junction patterns as which of the following?
    1. Lead
    2. Calcium
    3. Fluoride
    4. Strontium
    5. None of the above
    5. None of the above
  16. Deficiency of vitamin A in a developing tooth most likely affects the
    1. Pulp
    2. Enamel
    3. Dentin
    4. Cementum
    2. Enamel
  17. Visual purple, rhodopsin, is usually formed in the
    1. Lens
    2. Liver
    3. Retina
    4. Adrenals
    5. Vitreous humor
    3. Retina
  18. Aldosterone is normally associated with partial regulation of which of the following processes?
    1. Sodium balance
    2. Gluconeogenesis
    3. Lipid digestion
    4. Protein degradation
    5. Carbohydrate metabolism
    1. Sodium balance
  19. The normal delay in sexual development until puberty is attributed to
    1. Lack of effect of sex hormones on somatic tissue
    2. Failure of the gonads to respond to gonadotrophins
    3. Inability of the hypophysis to synthesize gonadotrophins
    4. Lack of hypothalamic stimulation of gonadotrophin release
    5. Inability of the hypophysis to respond to hypothalamic releasing hormones
    4. Lack of hypothalamic stimulation of gonadotrophin release
  20. Neutral fats contain mixtures of one or more fatty acids esterified with
    1. Sterol
    2. glycerol
    3. Lecithin
    4. sphingosine
    5. Alcohols of high molecular weight
    2. glycerol
  21. At rest, the potential difference across the membrane of which of the following is greatest?
    1. Odontoblast
    2. Sinoatrial node
    3. Skeletal muscle
    4. Viscera smooth muscle
    3. Skeletal muscle
  22. Antidiuretic hormone acts to
    1. Decreased renal filtration fraction
    2. Increase storage capacity of the bladder
    3. Decrease permeability of distoconvoluted tubules and/or collecting ducts to water
    4. Increase permeability of distoconvoluted tubules and/or collecting ducts to water
    4. Increase permeability of distoconvoluted tubules and/or collecting ducts to water
  23. The rapid movement of a substance across a biological membrane against a concentration gradient requires
    1. That the substance be negatively charged
    2. Participation of an energy-requiring active transport system
    3. That the substance be readily soluble in the lipid barrier of the membrane
    4. That the substance be carried across the membrane by rapid influx of the solvent
    5. Facilitated diffusion of the substance aided by some Binding system in the membrane
    2. Participation of an energy-requiring active transport system
  24. With glutamic acid as an amino group donor, alanine can be synthesized directly from which of the following acids?
    1. Lactic acid
    2. Pyruvic acid
    3. Glutaric acid
    4. a-ketoglutaric acid
    5. 3-phosphoglyceric acid
    2. Pyruvic acid
  25. Neutralization of acids by saliva results mainly from which of the following salivary contents?
    1. Mucin
    2. Ammonia
    3. Carbonate
    4. Bicarbonate
    5. Amino acids
    4. Bicarbonate
  26. Compared with hemoglobin A, the substitution of a valine for a glutamic acid residue in hemoglobin S results from
    1. A genetic mutation
    2. Irradiation of hemoglobin A
    3. Proteolytic action in the liver
    ;. Exposure to low oxygen tension
    1. A genetic mutation
  27. Where is norepinephrine stored?
    1. At preganglionic sympathetic nerve endings
    2. At postganglionic sympathetic nerve endings
    3. At preganglionic parasympathetic nerve endings
    4. At postganglionic parasympathetic nerve endings
    2. At postganglionic sympathetic nerve endings
  28. The most abundant form of iron in human blood plasma is found
    1. As free Fe ++
    2. As free Fe +++
    3. As ferritin
    4. Associated with transferrin
    5. Associated with ceruloplasmin
    4. Associated with transferrin
  29. The main control over body temperature located in a portion of the central nervous system is the
    1. Pons
    2. Cerebellum
    3. Hypothalamus
    4. Medulla oblongata
    3. Hypothalamus
  30. The second heart sound is related to
    1. Excitation of atria
    2. Opening of AV valves
    3. Closure of AV valves
    4. Opening of aortic valves
    5. Closure of aortic valves
    5. Closure of aortic valves
  31. In males, growth and development of secondary sex organs are under direct control of 
    1. FSH and LH
    2. Aldosterone
    3. Progesterone
    4. Testosterone
    4. Testosterone
  32. The relative refractory period of a nerve corresponds to
    1. Sodium permeability changes
    2. Decreased potassium permeability
    3. Increased potassium permeability 
    4. Threshold potential that is farther from zero
    3. Increased potassium permeability
  33. The major center in the brain for autonomic nervous system regulation is the
    1. Hypothalamus 
    2. Pituitary 
    3. Cerebral cortex
    4. Vestibular nuclei
    5. Floor of the fourth ventricle
    1. Hypothalamus
  34. Some sense organs, when stimulated continuously by a constant stimulus, may gradually lose their habilitation to continue to respond. This phenomenon is known as
    1. Occlusion
    2. Summation
    3. Adaptation
    4. facilitation
    5. Sensory deprivation
    3. Adaptation
  35. The Henderson-Hasselbach equation shows that
    1. Dilution of a buffer increases its pH
    2. pH is a function of temperature
    3. pH = pka when a acid is tenth normal
    4. pH = pka when an acid is half neutralized
    5. pH is independent of the dissociation constant of the acid
    4. pH = pka when an acid is half neutralized
  36. In the absence of compensatory changes, a drop in blood pressure results from
    1. Vasoconstriction
    2. Increased hematocrit
    3. Increase stroke volume
    4. Increased cardiac output
    5. Decreased venous return
    5. Decreased venous return
  37. DNA damage by ultraviolet light is due to 
    1. Alkylation of the guanine in DNA
    2. Excessive unwinding of the DNA molecule
    3. Frequent replacement in the DNA molecule of purines by pyrimidines
    4. Induction of dimerization by way of covalent bonds between adjacent thymine groups
    4. Induction of dimerization by way of covalent bonds between adjacent thymine groups
  38. Sucrose is a glycoside of which of the following structures?
    1. 4-D-glucose-a-D-galactopyranoside
    2. 4-D-glucose-b-D-galactopyranoside
    3. a-D-glucopyranosido-b-D-fructofuranoside
    4. b-D-glucopyranosido-b-D-fructofuranoside
    3. a-D-glucopyranosido-b-D-fructofuranoside
  39. Which of the following is a function of vitamin B6 (pyridoxal phosphate)?
    1. Prevents pernicious anemia
    2. Allows adaptation to dim light
    3. Acts as coenzyme in transamination reactions 
    4. Prevents microcytic hypochromic anemia
    3. Acts as coenzyme in transamination reactions
  40. Carbon monoxide decreases the amount of
    1. Bicarbonate int eh blood plasma
    2. Carbonic anhydrase available in the lungs
    3. Oxygen that can be transported by hemoglobin
    4. Alveolar surface available for gaseous exchange
    5. Carbon dioxide that can be transported by the blood
    3. Oxygen that can be transported by hemoglobin
  41. The most likely cause of an increase in filtration fraction is
    1. Elevation of ureteral pressure
    2. Efferent arteriolar constriction
    3. Afferent arteriolar constriction
    4. Elevation of renal vein pressure
    5. Elevation of plasma protein concentration
    2. Efferent arteriolar constriction
  42. The two chains of double stranded DNA are so arranged that
    1. They are parallel
    2. Heat does not affect inter chain bonds
    3. Hydrophobic aromatic nitrogen bases are held close to each other
    4. Purines and pyrimidines alternate along each chain
    5. An adenine residue on one chain is directly hydrogen bonded to a cytosine on the other chain
    3. Hydrophobic aromatic nitrogen bases are held close to each other
  43. A deficiency of rhodopsin is most likely caused by decreased dietary intake of
    1. Glucose
    2. Adenine
    3. Vitamin A
    4. Tryptophan
    5. Riboflavin
    3. Vitamin A
  44. Removal of a molecule of water between the carboxyl group of one amino acid and the amino group of a second amino acid results in formation of a
    1. Zwitterion
    2. Peptide bond
    3. Hydrogen bond
    4. Glycosidic bond
    5. Hydrophobic bond
    2. Peptide bond
  45. The primary effect of calcitonin is to 
    1. Increase bone resorption
    2. Inhibit bone resorption
    3. Increase calcium absorption from the intestine
    4. Decrease calcium absorption from the intestine
    2. Inhibit bone resorption
  46. The belief that the secretion of saliva is an active process is supported by the observation that
    1. During secretion, there is vasodilation within the gland
    2. During secretion, blood flow through e gland is unchanged
    3. During secretion, blood flow through the gland is decreased
    4. Secretion continues even when the pressure within the salivary duct is higher than the blood pressure
    5. Secretion stops if the pressure within the salivary duct is the same as the blood pressure
    4. Secretion continues even when the pressure within the salivary duct is higher than the blood pressure
  47. Which of the following enzymes catalyzes the formation of Uric acid from purines?
    1. Urease
    2. Uricase
    3. Xanthine oxidase
    4. Aspartate transcarbamylase
    5. Carbaryl phosphate synthetase
    3. Xanthine oxidase
  48. The process by which extensor muscles acting at a particular joint are inhibited by stretch of the flexor muscle acting at the same joint is 
    1. Myotatic refle
    2. Clasp-knife reflex
    3. Mono synaptic reflex
    4. Lateral inhibition
    5. Reciprocal inhibition
    5. Reciprocal inhibition
  49. Carbon dioxide of bicarbonate is required in the byosinthesis of fatty acids because
    1. The bicarbonate/carbonic acid buffer system is very efficient at the pH optimum of this sensitive enzyme system
    2. Bicarbonate is a positive effector for this system and favorably alters the conformation of its enzymes
    3. Carbon dioxide is incorporated into acetyl coenzyme A forming malonyl coenzyme A, an intermediate in the synthetic process
    4. Carbon dioxide is incorporated into carbamyl phosphate, a reactive intermediate in the synthetic process
    5. Carbon dioxide provides an anaerobic environment that prevents oxidation of the sulfhydryl groups in the reactive sites of theenzyme  system
    3. Carbon dioxide is incorporated into acetyl coenzyme A forming malonyl coenzyme A, an intermediate in the synthetic process
  50. Any substance that is filtered by glomeruli and secreted, but not reabsorbed, by renal tubules will have a renal clearance that is
    1. Equal to the clearance of urea
    2. Equal to he clearance of inulin
    3. Less than the clearance of inulin
    4. Greater than the clearance of inulin
    5. Equal to the glomerular filtration rate
    4. Greater than the clearance of inulin
  51. Energy for ATP synthesis is derived from the electron transport system by which of the following processes?
    1. Transamination
    2. Aldolization
    3. Reductive synthesis
    4. Oxidative deamination
    5. Oxidative phosphorylation
    5. Oxidative phosphorylation
  52. Which of the following statements is true concerning fatty acids synthesis and fatty acids breakdown?
    1. Both are mitochondrial functions
    2. Both require phosphopantothenic acid
    3. Both share common electron donors and electrons
    4. Both share common enzymes for oxidation and reduction reactions
    2. Both require phosphopantothenic acid
  53. The function of rhythmic segmentation is chiefly that of
    1. Macerating food
    2. Mixing food with digestive secretions
    3. Increasing the surface available for absorption
    4. Transporting material down the gastrointestinal tract
    2. Mixing food with digestive secretions
  54. Lipids are most characteristic of which of the following cellular components?
    1. Cytoplasm
    2. Ribosomes
    3. Membranes
    4. Chromosomes
    3. Membranes
  55. Which of the following is true to the Tm (melting temperature) of a given DNA double helix?
    1. Is a function of the base composition
    2. Can be used to accurately predict its molecular weight
    3. Can be measured by observing the change in chemical  composition
    4. Is higher if individual strands of the DNA double helix are parallel rather than antiparallel
    1. Is a function of the base composition
  56. A submaximal direct stimulus to a skeletal muscle causes
    1. Contraction of no fibers
    2. Contraction of some fibers
    3. Partial contraction of all fibers in the muscle
    4. Less contraction than with a subminimal stimulus
    5. More contraction than with a maximal stimulus
    2. Contraction of some fibers
  57. Over a period of time, a man uses 4 liters of oxygen and produces 3 liters of CO2.  What is his RQ for that period?
    1. 0.75
    2. 1.00
    3. 1.33
    4. 7.00
    1. 0.75
  58. The gallbladder is caused to contract by the hormone
    1. Gastrin
    2. Secretin
    3. Pancreozymin
    4. Enterogastrone
    5. Cholecystokinin
    5. Cholecystokinin
  59. The partial pressure of oxygen in arterial. Look is lower than that in alveoli. The condition suggested is
    1. Hyperventilation
    2. Slow blood flow
    3. High blood pressure
    4. Inadequate ventilation
    5. Thickening of the alveolar membrane
    5. Thickening of the alveolar membrane
  60. Which of the following tissues is primarily responsible for formation of urea?
    1. Liver
    2. Brain
    3. Kidney
    4. Muscle
    1. Liver
  61. In which of the following situations is an osmotic diuresis observed?
    1. During diabetes mellitus
    2. During water deprivation
    3. Following ingestion of starch
    4. Following injection of Pitressin
    1. During diabetes mellitus
  62. Which of the following causes some degree of temporary alkalosis?
    1. Hyperventilation 
    2. High fluid intake
    3. Excessive smoking
    4. Severe muscular effort
    5. Ingestion of ammonium chloride
    1. Hyperventilation
  63. Which of the following enzymes is involved in the termination of neuromuscular transmission?
    1. Choline acetylase
    2. Monoamine oxidase
    3. Methyltransferase
    4. Adenylate cyclase
    5. Acetylcholine esterase
    6. Catecholamine-ortho-methyltransferase
    5. Acetylcholine esterase
  64. A muscle devoid of tonus is 
    1. Atonic
    2. Spastic
    3. Hypotonic
    4. Hypertonic
    1. Atonic
  65. Which if the following characterizes an asymmetric carbon?
    1. A carbon atom with four identical groups attached to it
    2. A carbon atom with four different groups attached to it
    3. A carbon with at least one carboxyl and one amino group attached to it
    4. A carbon atom that has two heavy groups on
    2. A carbon atom with four different groups attached to it
  66. Which of the following statements supports the observation that the glomerulus acts like a simple physical microfilter?
    1. Potassium in is both secreted and reabsorbed by the nephron
    2. Antidiuretic hormone alters permeability of the tubular cell membrane
    3. Glomerular filtration rate is determined by plasma clearance of inulin
    4. Increased concentration of colloids in plasma diminishes the formation of filtrate
    5. The afferent arterioles is greater in diameter than the efferent arteriole
    4. Increased concentration of colloids in plasma diminishes the formation of filtrate
  67. Hydroxylation of proline and lysine during collagen biosynthesis occurs
    1. After translation
    2. In the mitochondrial matrix
    3. Before formation of their respective amino acrylic-t-RNA's 
    4. While proline or lysine is bound to the peptidyl (P) site on the ribosome
    1. After translation
  68. Which of the following is most likely to promote depolymerization of the ground substance?
    1. Cortisone
    2. Collagenase
    3. Hyaluronidase
    4. Ammonium phosphate
    3. Hyaluronidase
  69. Prostaglandins are made within cells
    1. On an RNA
    2. On rough endoplasmic reticulum
    3. From methionine
    4. From progesterone
    5. From polyunsaturated fatty acids
    5. From polyunsaturated fatty acids
  70. Thyroid secretion is stimulated by
    1. Hypoxia
    2. Propylthiouracil
    3. Exogenous thyroid hormone
    4. High serum iodide concentration
    5. Prolonged exposure to a cold environment
    6. Prolonged exposure to a warm environment
    5. Prolonged exposure to a cold environment
  71. Following exercise ventilation is in excess of the metabolic requirement. During this period, the level of lactic acid in blood
    1. Increases
    2. Decreases
    3. Remains unchanged
    2. Decreases
  72. Which of the following vitamins can be supplied to humans by the normal action of intestinal flora?
    1. A
    2. D
    3. E
    4. K
    5. None of the above
    4. K
  73. Some amino acids need not be present in the diet of an animal because of the animals ability to synthesize the acids at an adequate rate. A principal source of carbon for these amino acids is
    1. Nucleic acids
    2. Carbon dioxide
    3. Metabolism of carbohydrates
    4. Methylene folic acid derivatives
    3. Metabolism of carbohydrates
  74. Distribution of fluids between intracellular. And extracellular compartments is mainly achieved by
    1. Bulk flow across the capillary wall
    2. Unrestricted movement of sodium to achieve osmotic balance
    3. Unrestricted movement of water to achieve osmotic balance
    4. Unrestricted movement of both sodium and potassium to achieve osmotic balance
    5. Movement of potassium out of the intracellular compartment to achieve osmotic balance
    3. Unrestricted movement of water to achieve osmotic balance
  75. The sensory organs concerned with maintenance of skeletal muscle tonus are
    1. Muscle spindles
    2. Gamma efferents
    3. Pacinian corpuscles
    4. Golgi tendon organs
    1. Muscle spindles
  76. An electrocardiogram showing extra P waves before each QRS complex indicates 
    1. Fibrillation
    2. Atrial bradycardia
    3. Partial heart block
    4. Ventricular tachycardia
    5. Left bundle branch block
    3. Partial heart block
  77. In which of the following parts of the circulatory system is blood pressure the lowest?
    1. Aorta
    2. Veins
    3. Arterioles
    4. Capillaries
    5. Large arteries
    2. Veins
  78. Carbohydrate is stored in the body principally as
    1. Glucose
    2. Maltose
    3. Sucrose
    4. Glycogen
    5. Glycosaminoglycans
    4. Glycogen
  79. Within physiologic limits, activity of the respiratory center is decreased directly by
    1. Decreased pH
    2. Increased pH
    3. Increased hemoglobin concentration
    4. Increased plasma carbon dioxide partial pressure
    2. Increased pH
  80. The tone of the masseter muscle is maintained by the
    1. Flexor reflex
    2. Stretch reflex
    3. Crossed-extensor reflex
    4. Continuous production of metabolic products
    2. Stretch reflex
  81. The air remaining in alveoli at the end of a maximal expiration is the
    1. Tidal volume
    2. Vital capacity
    3. Residual volume
    4. Expiratory reserve volume
    5. Inspiratory reserve volume
    3. Residual volume
  82. The plasma membrane can be best described as 
    1. A static trilamellar lipid-protein-lipid sheath
    2. A static mosaic composed primarily of lipids and proteins
    3. An unorganized zone between cytoplasm and interstitial fluid
    4. A membrane whose composition is essentially
    constant for all mammalian cells
    5. A fluid mosaic composed of neutral fats and glycoproteins
    6. A fluid mosaic composed primarily of phospholipids, cholesterol, and glycoproteins
    6. A fluid mosaic composed primarily of phospholipids, cholesterol, and glycoproteins
  83. Functions of the hexose monophosphate shunt include production of 
    a) glucose in acid for heparin synthesis
    b) NADPH for fatty acid synthesis 
    c) NADP for pyruvate reduction
    d) D-ribose for Nucleic acid synthesis
    e) ATP for anaerobic muscle contraction
    • b) NADPH for fatty acid synthesis
    • d) D-ribose for Nucleic acid synthesis
  84. Ventricular muscle responds to norepinephrine by
    a) increasing the force of contraction
    b) decreasing the force of contraction
    c) increasing the rate of contraction
    d) decreasing the rate of contraction
    • a) increasing the force of contraction
    • c) increasing the rate of contraction
  85. The secretory product of which of the following endocrine organs is controlled by a pituitary tropic hormone?
    a) adrenal cortex
    b) thyroid
    c) parathyroid
    d) thymus
    e) pancreas
    • a) adrenal cortex
    • b) thyroid
  86. The mechanism of fluoride action in reducing dental decay involves
    a) An increase in remineralization of incipient caries 
    b) a reduction of solubility of enamel as fluoride content increases 
    c) an enhancement of plaque accumulation 
    d) an increase in carbohydrate metabolism in oral bacteria
    • a) An increase in remineralization of incipient caries 
    • b) a reduction of solubility of enamel as fluoride content increases
  87. Muscle glycogen phosphorylase is activated by
    A) Epinephrine
    B) insulin
    C) Glucagon 
    A) Epinephrine
    (this multiple choice question has been scrambled)
  88. The amino acid composition of mammalian collagen (type I) is characterized by the presence of 
    a) Cysteine
    b) Hydroxyproline and hydroxylysine
    c) No sulfur-containing amino acidsglycine, as nearly one third the total number of amino acid residues
    d) a high content of aromatic amino acids
    • b) Hydroxyproline and hydroxylysine
    • c) No sulfur-containing amino acidsglycine, as nearly one third the total number of amino acid residues
    • d) a high content of aromatic amino acids
  89. Which of the following molecules is NOT part of the mammalian cell membrane?
    1. Endotoxin
    2. Cardiolipin
    3. Plasmalogen
    4. Proteoglycan
    5. Lipopolysaccharide
    1. Endotoxin
  90. Which of the following hormones does NOT induce activation of adenylate cyclase?
    1. Insulin
    2. Glucagon
    3. Epinephrine
    4. Parathyroid hormone
    1. Insulin
  91. Which if the following is least soluble in solutions with low pH?
    1. Chlorapatite
    2. Fluorapatite
    3. Hydroxiapatite
    4. Calcium fluoride
    2. Fluorapatite
  92. All of the following function in buffer systems in the blood EXCEPT
    1. NaCl
    2. H2CO3
    3. NaHCO3
    4. Na2HPO4
    5. NaH2PO4
    1. NaCl
  93. Which of the following compounds does NOT contain a high energy bond?
    1. ATP
    2. Acetyl CoA
    3. UDP-glucose
    4. Glucose-6-phosphate
    5. Phosphoenolpiruvate
    4. Glucose-6-phosphate
  94. Which of the following is NOT a cofactor or a substance involved in Hydroxylation of proline during collagen biosynthesis?
    1. Ascorbate
    2. Ergosterol
    3. Ferrous ion
    4. A-ketoglutarate
    2. Ergosterol
  95. Which of the following statements is NOT true about ammonia and the a amino group of amino acid?
    1. NH+4 is formed from glut amine in the kidney
    2. The amino group in carbamyl phosphate is directly donated by aspartate in a transamination reaction
    3. Cellular levels of ammonia must be maintained at low concentrations because of its toxicity
    4. Glutamate dehydrogenase can catalyze the formation of glutamate from ammonia and a-ketoglutarate using NADPH as a cofactors
    2. The amino group in carbamyl phosphate is directly donated by aspartate in a transamination reaction
  96. Which of the following is NOT a monosaccharide?
    1. Amylose
    2. Glucose
    3. Fructose
    4. Glyceraldehyde
    5. Glucoronic acid
    1. Amylose
  97. Which if the following statements is NOT true concerning fluoride?
    1. It is excreted rapidly by the kidney 
    2. It is deposited in calcified tissues
    3. It occurs only in the ionic form in plasma
    4. It passes the placental barrier relatively slowly
    5. At 1 ppm. In water, it is tasteless, odorless and colorless
    3. It occurs only in the ionic form in plasma
  98. Hydroliysis of Nucleic acids is likely to yield all of the following EXCEPT
    1. ribose
    2. Adenine
    3. Deoxyribose
    4. Acetic acid
    5. Phosphoric acid
    4. Acetic acid
  99. Which of the following compounds is NOT involved in coagulation of blood?
    1. Fe+ 2
    2. Ca + 2
    3. Prothombin
    4. Fibrinogen
    5. thromboplastin
    1. Fe+ 2

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