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ashtonh
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2012-05-02 01:11:18
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Past Biology exam questions
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Past Bio Exams Questions
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  1. Changing the number of protons forms ions of the same element: true or false?
    False
  2. Changing the number of protons forms ions of the same element: true or false?
    false
  3. Changing the numner of electrons forms ions of the same element: true or false?
    True
  4. Most of the volume of an atom is what?
    empty space
  5. Which answer below places molecules or subcellular structures in the correct order by size, from smallest to largest?
    A) amino acid, phospholipid, mitochondria
    B) water, polysaccharide, glucose
    C) ATP, water, mitochondria
    D) ribosome, ATP, phospholipids
    E) ribosome, glucose, mitochondria
    A. Amino Acid, phospholipid, mitochondria
  6. Which answer below places molecules or subcellular structures in the correct order by size, from smallest to largest?
    A) oxygen molecule, glucose, polysaccharide
    B) the amino acid glycine, mitochondria, Na+/K+ pump
    C) Na+/K+ pump, water, the amino acid glycine
    D) phospholipids, the amino acid glycine, golgi
    E) ribosome, glucose, mitochondria
    A. Oxygen molecule, glucose, polysaccharide
  7. In the formation of salt the chlorine atom does what?
    Gains an electron from sodium
  8. In the formation of salt the sodium atom does what?
    has one more proton than electron and becomes a possitive ion
  9. Atoms form covalent bonds with each other by?
    Transferring electrons from one atom to the other
  10. Hydrogen bonds can form
    Between and oxygen atoma and hydrgoen bond to an oxygen atom
  11. Rank the following types of bonds in order from
    strongest to weakest:
    A)hydrogen, van der Waals, covalent
    B)covalent, hydrogen, van der Waals
    C)van der Waals, hydrogen, covalent
    D)hydrogen, covalent, van der Waals
    E)covalent, van der Waals, hydrogen
    B. covalent, hydrogen, van der waals
  12. In a single molecule of water, hydrogen atoms are bonded to an oxygen atom by
    polar covalent bonds
  13. Table Salt (NaCl) is an example of what kind of bonding?
    Ionic Bonding
  14. What is the difference between ionic and covalent bonds?
    Covalent bonds involve sharing of electrons between atoms and ionic bonds involve the electrical attractions between ions.
  15. Which of the following is an INCORRECT statement?
    A) Organic molecules may occur in various shapes. The structure of molecules determine their functions
    B) Carbon bonds are stable at the different temperatures associated with life
    C) Organic compounds may contain functional groups
    D)Organic chemistry is the science of studying Hydrogen-containing molecules,
    which are found in living organisms
    D)Organic chemistry is the science of studying Hydrogen-containing molecules,which are found in living organisms
    (this multiple choice question has been scrambled)
  16. Which of the following is the correct pairing?
    A) Non-polar covalent bond- H2O
    B) Polar covalent bond- CH4
    C) Hydrogen bond- NaCl
    D) Ionic bond- NaCl
    D) Ionic bond- NaCl
    (this multiple choice question has been scrambled)
  17. Olive oil is usually found as a liquid form at room temperature. Knowing this it could be expected that:
    Most bonds are unsaturated. More double bonds means more fluidity at room temperature.
  18. Which of the following can diffuse across a cell membrane unfacilitated?
    A) K+
    B) CO2
    C) Glucose
    D) Ca2+
    B) CO2
    (this multiple choice question has been scrambled)
  19. Which of the following can diffuse across a cell membrane unfacilitated?
    A) Methionine (an aminoacid)
    B) O2
    C) Na+
    D) ATP
    B) O2
    (this multiple choice question has been scrambled)
  20. What would require a transporter or channel in order to cross the cell membrane?
    Sodium and lysine(amino acid)
  21. What properties of molecules deny crossing of the lipid bilayer without help from a transport protein?
    Large molecules and polar molecules
  22. Cohesion is the tendency for molecules to be attracted to one another. Which of the following properties of water molecules is responsible for the cohesion?
    Hydrogen bonds
  23. What type of bond must be broken for water to viporize?
    Hydrogen bonds
  24. What characteristic is likely to make a molecule soluble in water?
    An ability to form Hydrogen bonds
  25. What functional group would make macromolecule more hydrophobic?
    Methyl Group (-CH3)
  26. What functional groups would make a macromolecule more hydrophillic
    Hydroxyl group (OH-), Methyl group (-CH3), Amino Group (-NH2), and Carboxyl Group (-COOH)
  27. What is the advantage of having membranes in a cell?
    the compartmentalize the cell
  28. A function of mitochondria in a prokaryotic bacterium is?
    nothing. There are no mitochondria in prokaryotes
  29. A function of the nuclueus in a prokarytic bacterium is?
    Nothing. There is no nuleus in prokaryotes.
  30. A function of mitochondria in plant cells is?
    To catabolize organic molecule converting that energy into ATP
  31. A function of rough ER in eukaryotic cells is
    translate proteins that are targeted for the endomembrane system
  32. What common components of the fluid mosaic model?
    lipids, proteins, and carbohydrates
  33. What types of molecules are the major structural components of the cell membrane?
    phospholipids and proteins
  34. What molecules are part of the animal cell membrane?
    polypeptides, sugars, phosphate groups, and steroids
  35. At a pH of 8, what is the [H+]?
    1x108-
  36. Which of the following solutions has the greatest concentration of hydroxyl ions [OH-]?
    seawater at pH 8
  37. Which of the following solutions has the greatest concentration of hydrogen ions [H+]?
    gastric juice (pH 2)
  38. Pure, freshly-distilled water has a pH of 7. This means that
    • the concentration of H+ ions in the water equals
    • the concentration of OH- ions in the water.
  39. Secondary structure refers to the common structural motifs, such as α-helixes and β-pleated sheets, which result from interactions between adjacent amino acid
    side chains. What type of bond maintains the secondary structure of a protein?
    hydrogen bonds
  40. In some proteins, the “R groups” in cysteines on 2 amino acids in different parts of the protein form disulfide bonds, a covalent bond. This
    contributes to the?
    teritary structure
  41. In eukaryotic cells, many proteins are synthesized (translated) on ribosomes in the cytoplasm. For proteins that are to be secreted from the cell, protein synthesis occurs at the?
    rough endoplasmic reticulum
  42. Macromolecules are polymers. If the monomers are amino acids, what term describes the polymer?
    protein
  43. Macromolecules are polymers. If the monomers are carbohydrates, what term describes the polymer?
    polysaccharids
  44. Macromolecules are polymers. If the monomers are nucleotides, what term describes the polymer?
    DNA
  45. The covalent bonding of two amino acid molecules to form a larger [peptide] molecule requires?
    the release of a water molecule
  46. Polymerization of which of the following macromolecular structures does not involve dehydration synthesis?
    phospholipid bilayer
  47. Amino acid, monosaccharide or nucleotide monomers can be joined together to from protein, polysaccharide or nucleic acid polymers. What is the chemical mechanism by which cells make polymers from monomers?
    dehydration reactions
  48. Polysaccharides, nucleic acids, and proteins are similar in that they
    are synthesized from monomers by dehydration reactions
  49. What is an example of hydrolysis?
    The reaction of fat, forming glycerol and fatty acids with the utilization of water
  50. All of the following are often found in prokaryotic cells except?
    A) DNA.
    B) cell wall.
    C) plasma membrane.
    D) vesicles.
    E) ribosomes.
    Vesicles
  51. A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from:
    a plant or an animal, but not a prokaryote
  52. Characteristics of all cells?
    RNA, ribosomes, proteins
  53. Which of the following descriptions of a biological membrane ismost accurate?
    A fluid structure in which proteins “float” in a semi-liquid phospholipid bilayer
  54. According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
    They can move laterally along the plane of the membrane.
  55. Why are proteins free to move laterally in membranes?
    There are only weak hydrophobic interactions in the interior of the membrane.
  56. A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body
    fluids, distilled water, equal to the volume of blood lost, is transferreddirectly into one of his veins. What will be the most probable result of this transfusion?
    The patient's red blood cells will swell, because water will enter the cells
  57. When the cytoplasm of a cell is hypertonic to (has a higher solute concentration than) its environment,
    Osmosis will cause the cell to swell (and, in some cases, lyse).
  58. Which of the following statements is TRUE about facilitated diffusion?
    It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
  59. What kinds of molecules pass through a cell membrane most easily without the aid of a carrier protein or other transport mechanism?
    small and uncharged
  60. Water passes quickly through cell membranes because why?
    it moves through aquaporins in the membrane.
  61. Why did they use radioactive leucine?
    They wanted to follow protein synthesis and leucine is an amino acid
  62. Where within the cell does protein translation initiate?
    the cytoplasm
  63. The cytoskeleton provides structural support to an animal cell using
    actin fiaments, intermediate filaments, and microtubules
  64. The inside of a cell has a solute concentration of 0.3 M, while the outside is 0.2 M. If the membrane is impermeable to the solutes, the water will
    move into the cell
  65. The process of cell releasing or secreting enzymes is?
    exocytosis
  66. What type of transport protein can move 2 or more
    different molecules in opposite directions?
    antiporter
  67. phospholipids are synthesized in the?
    endoplasmic reticulum
  68. What type of amino acids would you expect to find in the transmembrane portion of a membrane protein?
    non-polar amino acids
  69. How is the sodium-potassium pump able to move ions against their concentration gradients?
    expending ATP
  70. All are true except?
    A) Shorter fatty acyl tails make the membrane more fluid
    B) Cholesterol makes the membrane more fluid at lower temperatures
    C) Cholesterol makes the membrane less fluid at higher temperatures
    D) Saturated fatty acyl tails makes the membrane more fluid
    E) Unsaturated fatty acyl tails makes the membrane more fluid
    D) Saturated fatty acyl tails makes the membrane more fluid
    (this multiple choice question has been scrambled)
  71. Proteins that reside in lysosomes traveled through?
    the endomembrane system
  72. Protein insertion in the ER membrane is typically what?
    Cotranslational
  73. The synthesis of proteins takes place where?
    on a rybosome, in the cytoplasm, on the surface of the rough endoplasmic reticulum, and in prokaryotic cells
  74. What types of chemical bonds contribute to protein folding?
    hydrogen bonds, ionic and other kinds of polar interactions, hydrophobic effects, van der waals forces, and covalent disulfide bridges

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