exam3.txt

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exam3.txt
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2010-12-14 18:13:26
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Cell BIO exam
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Cell BIO exam 3
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  1. 1- organisms that use solar energy to drive the biosynthesis of energy-rich organic molecules are named as
    • a. phototrophs
    • b. heterotrophs
    • c. photoautrophs
    • d. photoheterotrophs
  2. 2- during------------------------------- fully oxidized carbon atoms are fixed. Forming carbohydrates
    • a. calvin cycle
    • b. krebs cycle
    • c. proton cycle
    • d. electron cycle
  3. 3- when a ------------------ is absorbed by a pigment, the energy is transferred to an ---------
    • a. electron , electron
    • b. photon, electron
    • c. electron, photon
    • d. photon, water
  4. 4- photochemical reduction is
    • a. the transfer of a photoexcited proton itself to another molecule
    • b. the transfer of a photoexcited photon itself to another molecule
    • c. the transfer of a photoexcited electron itself to another molecule
    • d. none of the above
  5. 5- the skeleton of a chlorophyll consists of:
    • a. a central porphyrin ring and a strongly hydrophobic phytol side chain
    • b. a central porphyrin ring and a strongly hydrophilic phytol side chain
    • c. a central iron ring and a strongly hydrophobic phytol side chain
    • d. a central iron ring and a strongly hydrophilic phytol side chain
  6. 6- chlorophyll b is distinguished from chlorophyll a by the presence of
    • a. a formyl group in place of one methyl group
    • b. a methyl grup in place of one formyl group
    • c. a hydroxil group in place of one methyl group
    • d. a carbonil group in place of one formyl group
  7. 7- examples of accessories pigments are:
    • a. carotenoids
    • b. herpenes
    • c. phycobilins
    • d. a and b are correct
    • e. a and c are correct
  8. 8- light harvesting complex differ from a photosystem in:
    • a. light harvesting complex contain a reaction center and a photosystem does not
    • b. light harvesting complex does not contain a reaction center
    • c. light harvesting complex does not differ from a photosystem
    • d. light harvesting complex are part of a photosystem
  9. 9- the synthesis of ATP in plants in known as
    • a. phosphorylation
    • b. photophosphorylation
    • c. hydrophosphorylation
    • d. photonphosphorylation
  10. 10-the acceptor of carbon atoms in the calvin cycle is
    • a. water
    • b. glucose
    • c. rubisco
    • d. ribulose-1,5 bisphosphate
    • e. ribulose-1,3 bisphosphate
  11. 11-the enzyme that catalyzes the transfer of two electrons and one proton from NADPH to glycerate- 1,3 bisphosphate, reducing it to G-3-P is
    • a. rubisco
    • b. phosphoribulokinase
    • c. glyceraldehyde-3-phosphate dehydrogenase
    • d. glyceraldehyde-3-phosphate hydrogenase
    • e. none of the above
  12. 12-for every CO2 that is fixed, --------------3-PGA are generated
    • a. one
    • b. three
    • c. two
    • d. four
    • e. six
  13. 13-the enzyme that converts 3- phosphoglycerate to glycerate-1,3 bisphosphate is
    • a. phosphoribulosekinase
    • b. phosphoglycerokinase
    • c. phosphatidylcoline
    • d. phosphoglycerophosphatase
  14. 14-the rough ER is characterized by -----------------attached to the cytosolic side of the membrane.
    • a. lisosomes
    • b. peroxysomes
    • c. ribosomes
    • d. endosomes
  15. 15- ------------------is involved in the initial steps of addition and processing of carbohydrate groups.
    • a. Rough ER
    • b. Smooth ER
    • c. Golgi complex
    • d. All of the above
  16. 16- ----------------- is involved in drug detoxification
    • a. golgi complex
    • b. smooth ER
    • c. Rough ER
    • d. b and c are correct
  17. 17- calcium is commonly stored in
    • a. rough ER
    • b. golgi complex
    • c. endosomes
    • d. smooth ER
    • e. vesicules
  18. 18- flipasses are
    • a. glucolipid tranfers
    • b. glucolipid translocators
    • c. phospholipids transfers
    • d. phospholipids translocators
  19. 19- the cis-golgi network is:
    • a. the golgi compartment closest to ER
    • b. the golgi compartment closest to plasma membrane
    • c. the golgi compartment closest to nuclear membrane
    • d. none of the above
  20. 20- retrograde transport refers to:
    • a. the flow of vesicles from plasma membrane to lisosomes
    • b. the flow of vesicles from ER back toward the golgi
    • c. the flow of vesicles from golgi back toward the ER
    • d. the flow of particles back to the nucleus
  21. 21- the addition of oligossacharide to the oxyen atom on the hydroxyl group of certain residues is known as:
    • a. O-linked glycosylation
    • b. N-linked phosphorylation
    • c. O-linked phosphorylation
    • d. N-linked glycosylation
  22. 22- the transfer of the complete core oligossacharide to an asparagine residue of the recipient protein is catalized by
    • a. asparagyl transferase
    • b. oligosaccharil transferase
    • c. transposase
    • d. transferase asparagine dependent
  23. 23-constitutive secretion is:
    • a. a continuous and unregulated process
    • b. a continuous and dependent of specific extracellular signals process
    • c. a conservative process
    • d. none of the above
  24. 24- zymogens are:
    • a. active proteins
    • b. active enzymes
    • c. inactive precursors of carbohydrates
    • d. inactive precursors of hydrolytic enzymes
    • e. inactive precursors of transferases enzymes
  25. 25-the lysosomal enzymes tag consists on:
    • a. a carbohydrate phosphorylation
    • b. a protein phosphorylation
    • c. a hydroxylation
    • d. none of the above
  26. 26- phagocytosis is:
    • a. the ingestion of particles
    • b. the release of particles
    • c. the ingestion of whole microorganisms
    • d. the ingestion of other cells
    • e. a, c and d are correct
  27. 27- once a messenger reaches its target tissue, it binds to :
    • a. lipids
    • b. oligosaccharades
    • c. receptors
    • d. ligands
  28. 28- the ability of a cell to translate the information from a messenger to changes in its behavior or gene expression is known as
    • a. gene expression
    • b. protein production
    • c. post-translational modifications
    • d. signal transduction
    • e. protein folding
  29. 29- paracrine signals:
    • a. are released locally where they diffuse and act at short range on nearby tissues
    • b. are released to the bloodstream
    • c. act on the same cells that produces them
    • d. all of the above
  30. 30- drugs that activate the receptor to which they bind are known as:
    • a. ligands
    • b. antgonists
    • c. agonists
    • d. kinases
    • e. phosphatases
  31. 31- G-protein-linked receptors consists of:
    • a. five alpha helices and two loops
    • b. seven alpha helices and two loops
    • c. five alpha helices and one loop
    • d. seven alpha helices and one loop
  32. 32- G proteins are:
    • a. a dimeric protein
    • b. a trimeric protein
    • c. a heterodimeric protein
    • d. a heterotrimeric protein
  33. 33- Galpha is activated when it is bound to a molecule of:
    • a. GTP
    • b. GDP
    • c. ATP
    • d. ADP
  34. 34- Cyclic AMP is formed by cytosolic ATP by the enzyme
    • a. cytosyl cycle
    • b. adenyl cyclase
    • c. G cyclase
    • d. Phosphodiesterase
  35. 35- camp intramolecular target is
    • a. G protein
    • b. Glycogen phospholylase
    • c. Protein kinase A
    • d. polymerases
  36. 36--------------- cleaves PIP2 into IP3 and DAG
    • a. proteinase K
    • b. phospholipase C
    • c. oligossacharidase K
    • d. proteinase Calcium dependent
  37. 37- calcium release is necessary for
    • a. stimulate the exocytosis of vesicles
    • b. egg activation
    • c. pancreas activation
    • d. a and b are correct
    • e. all are correct
  38. 38- the first messenger of nitric oxide synthesis is
    • a. epinephrine
    • b. acetylcholine
    • c. nicotine
    • d. norepinephrine
  39. 39- IP3 function is:
    • a. protein packaging
    • b. calcium release from the ER
    • c. ATP syntase regulation
    • d. cAMP degradation
  40. 40- smooth muscle cell relaxation in the endothelium is induced by
    • a. ATP
    • b. cAMP
    • c. Proteinase G
    • d. Proteinase C
    • e. cGMP
  41. 41- DAG activates:
    • a. protein kinase A
    • b. protein kinase B
    • c. protein kinase C
    • d. protein kinase D
  42. 42- G protein is inactivated by:
    • a. hydrolysis of ATP to ADP and re-association with G beta gamma
    • b. hydrolysis of GTP to GDP and re- association with G beta gamma
    • c. proteinase C
    • d. Calcium concentration
  43. 43- the production of sucrose is confined to:
    • a. the cytosol
    • b. the stroma
    • c. the thylacoid
    • d. the gramun
  44. 44- low pH in late endosomes causes:
    • a.enzyme degradation
    • b.enzyme activation
    • c.enzyme dissociation from its receptor
    • d.enzyme association to its receptor

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