Biochemistry Block #3

102 Questions

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Biochemistry Quizzes & Trivia

Questions and Answers
  • 1. 
    • A. 

      Glyceraldehyde-3-phosphate

    • B. 

      Ribose 5 phosphate

    • C. 

      Fructose-6-phosphate

    • D. 

      NADPH

    • E. 

      All of the above

    • F. 

      3 of the above

  • 2. 
    The pentose phosphate pathway provides an alternate pathway for Glucose-6-phosphate. How many NADPH are produced and in what phase of the pathway?
    • A. 

      3 NADPH produced; Oxidative phase

    • B. 

      2 NADPH produced; Nonoxidative phase

    • C. 

      2 NADPH produced; Oxidative phase

    • D. 

      3 NADPH produced; Nonoxidative phase

  • 3. 
    • A. 

      Xylulose-5-phosphate

    • B. 

      Ribulose-5-phosphate

    • C. 

      Ribose-5-phosphate

    • D. 

      Fructose-6-phosphate

  • 4. 
    The product of fructose metabolism can be fed into the glycolytic pathway. Which of these is the final product of fructose metabolism?
    • A. 

      Fructose-6-phosphate

    • B. 

      Phosphofructokinase

    • C. 

      Glyceraldehyde-3-phosphate

    • D. 

      Glucose

  • 5. 
    Which component of the Krebs cycle can produce glucose via gluconeogenesis if needed in the body?
    • A. 

      Succinyl CoA

    • B. 

      Isocitrate

    • C. 

      Citrate

    • D. 

      Oxaloacetate

    • E. 

      2 of the above

  • 6. 
    Glycogen is the stored form of glucose. Which of the following in an inhibitor of glycogenesis?
    • A. 

      Insulin

    • B. 

      Epinephrine

    • C. 

      Glucagon

    • D. 

      2 of the above

    • E. 

      All of the above

  • 7. 
    The first step of glycogenesis is conversion of Glucose-6-phosphate to Glucose-1-phosphate by what enzyme?
    • A. 

      Phosphoglucose Isomerase

    • B. 

      Phosphoglucomutase

    • C. 

      Phosphoglucose Dehydrogenase

    • D. 

      Hexokinase

  • 8. 
    The extension of glycogen primers is accomplished by what enzyme?
    • A. 

      Glycogenin

    • B. 

      Glycogen synthase

    • C. 

      Glycogen Hydrolase

    • D. 

      UDP-Glucose Phosphorylase

  • 9. 
    Glycogen phosphorylase cleaves __________ while debranching enzyme cleaves _________. 
    • A. 

      Alpha 1,6 linkages; alpha 1,4 linkages

    • B. 

      Alpha 1,4 linkages; alpha 1, 6 linkages

    • C. 

      Beta,1,6 linkages; beta 1,4 linkages

    • D. 

      Beta 1,4 linkages; beta 1,6 linkages

  • 10. 
    Which of the following does not occur when glucagon binds to its receptor on the cell membrane.
    • A. 

      Glycogen synthase is activated

    • B. 

      Phosphorylase Kinase activates glycogen phosphorylase

    • C. 

      Adenylate cyclase converts ATP to cyclic AMP

    • D. 

      Glycogen phosphorylase breaks down glycogen

    • E. 

      Cyclic AMP activates phosphorylase kinase

  • 11. 
    Which of the below is not required for the oxidative decarboxylation of pyruvate to form acetyl-CoA?
    • A. 

      ATP

    • B. 

      CoA-SH

    • C. 

      FAD

    • D. 

      Lipoic Acid

    • E. 

      NAD+

  • 12. 
    Which enzyme is responsible for the production of isocitrate in the Krebs cycle?
    • A. 

      Citrate synthase

    • B. 

      Isocitrate synthetase

    • C. 

      Aconitase

    • D. 

      Pyruvate Carboxylase

  • 13. 
    The reaction of the citric acid cycle that produces an ATP equivalent (in the form of GTP) by substrate level phosphorylation is the conversion of:
    • A. 

      Citrate to Isocitrate

    • B. 

      Fumarate to Malate

    • C. 

      Malate to Oxaloacetate

    • D. 

      Succinate to Fumarate

    • E. 

      Succinyl-CoA to Succinate

  • 14. 
    When we describe the krebs cycle as amphibolic, we mean that
    • A. 

      It can carry out synthetic and degradative reactions

    • B. 

      Other molecules can replenish substrates in the cycle

    • C. 

      It can carry out anabolic reactions

    • D. 

      It can carry out catabolic reactions

  • 15. 
    All of the oxidative steps of the citric acid cycle are linked to the reduction of NAD+  except the reaction catalyzed by:   
    • A. 

      Isocitrate Dehydrogenase

    • B. 

      Malate dehydrogenase

    • C. 

      Succinate dehydrogenase

    • D. 

      Pyruvate dehydrogenase

    • E. 

      Alpha ketoglutarate dehydrogenase complex

  • 16. 
    Which of the following cofactors is required for the conversion of succinate to fumarate in the citric acid cycle?   
    • A. 

      ATP

    • B. 

      Biotin

    • C. 

      FAD

    • D. 

      NAD+

    • E. 

      NADP+

  • 17. 
    Entry of acetyl-CoA into the citric acid cycle is decreased when:
    • A. 

      AMP is high

    • B. 

      ATP is low

    • C. 

      NADH is rapidly oxidized through respiration

    • D. 

      ATP is high

    • E. 

      NAD+ is high

  • 18. 
    While oxaloacetate can produce pyrimidines when needed in the body, ___________ can produce the purines. 
    • A. 

      Citrate

    • B. 

      Succinyl CoA

    • C. 

      Alpha-ketoglutarate

    • D. 

      Fumarate

  • 19. 
    • A. 

      2

    • B. 

      4

    • C. 

      6

    • D. 

      8

  • 20. 
    The electrons removed from NADH by complex 1 in the ETC are transferred to what coenzyme?
    • A. 

      Cytochrome c

    • B. 

      UQ (CoQ)

    • C. 

      Succinate dehydrogenase

    • D. 

      Cytochrome a

  • 21. 
    Which complex in the electron transport chain does not contribute to the proton gradient?
    • A. 

      I

    • B. 

      II

    • C. 

      III

    • D. 

      IV

  • 22. 
    • A. 

      2 NADH

    • B. 

      3 NADH

    • C. 

      2 FADH2

    • D. 

      1 FADH2

    • E. 

      A and D

    • F. 

      B and D

    • G. 

      None of the above

  • 23. 
    The citric acid cycle can produce precursors for all of the following except
    • A. 

      Lipids

    • B. 

      Sugars

    • C. 

      Amino Acids

    • D. 

      Nucleic Acids

    • E. 

      TCA cycle can produce precursors for all of these molecules

  • 24. 
    Which of the following is not a coenzyme for the citric acid cycle (or its preliminary reactions)
    • A. 

      TPP

    • B. 

      FAD

    • C. 

      NAD

    • D. 

      CoASH

    • E. 

      Lipoic Acid

    • F. 

      CoQ-10

  • 25. 
    The production of acetyl-CoA from pyruvate (which comes from glycolysis) is accomplished through
    • A. 

      The pyruvate carboxylase complex

    • B. 

      The pyruvate dehydrogenase complex

    • C. 

      Acetyl-CoA transferase complex

    • D. 

      Acetyl-CoA dehydrogenase complex

  • 26. 
    Which of the following would be an allosteric inhibitor (i.e. the body has enough of it) of the formation of Acetyl-CoA from pyruvate in the TCA cycle.
    • A. 

      AMP

    • B. 

      NAD+

    • C. 

      ATP

    • D. 

      CoASH

  • 27. 
    The reactions of the citric acid cycle take place in
    • A. 

      The mitochondrial matrix

    • B. 

      The inner membrane of the mitochondria

    • C. 

      The outer membrane of the mitochondria

    • D. 

      The cytoplasm

  • 28. 
    In the second reaction of the citric acid cycle citrate forms its isomer, isocitrate, through what enzyme?
    • A. 

      Isocitrate dehydrogenase

    • B. 

      Aconitase

    • C. 

      Citrate synthase

    • D. 

      Citrate hydrogenase

  • 29. 
    In the third reaction of the citric acid cycle, isocitrate is converted to alpha-ketoglutarate through what enzyme?
    • A. 

      Cis-aconitase

    • B. 

      Citrate synthase

    • C. 

      Alpha-ketoglutarate dehydrogenase

    • D. 

      Isocitrate dehydrogenase

  • 30. 
    In the fourth reaction of the TCA cycle, alpha-ketoglutarate is converted to succinyl CoA via what enzyme?
    • A. 

      Alpha-ketoglutarate dehydrogenase

    • B. 

      Alpha-ketoglutarate synthase

    • C. 

      Succinyl synthase

    • D. 

      Succinate synthase

  • 31. 
    If the fifth reaction of the TCA cycle, succinyl CoA is converted to succinate via what enzyme?
    • A. 

      Succinate synthase

    • B. 

      Succinyl-CoA synthetase

    • C. 

      Succinate dehydrogenase

    • D. 

      Fumarase

  • 32. 
    In the sixth reaction of the TCA cycle, succinate is converted to fumarate via what enzyme?
    • A. 

      Fumarase

    • B. 

      Maltase

    • C. 

      Succinate dehydrogenase

    • D. 

      Succinyl-CoA synthetase

  • 33. 
    In the seventh reaction of the TCA cycle, fumarate is hydrated to form malate via what enzyme?
    • A. 

      Malase

    • B. 

      Fumarase

    • C. 

      Fumarate dehydrogenase

    • D. 

      Malate synthase

  • 34. 
    In the 8th and last step of the TCA cycle, malate is oxidized to form oxaloacetate by what enzyme?
    • A. 

      Malase

    • B. 

      Malate dehydrogenase

    • C. 

      Malate succinase

    • D. 

      Oxaloacetate synthase

  • 35. 
    Which of the following is not a irreversible step of the TCA cycle?
    • A. 

      Isocitrate to alpha-ketoglutarate (Step 3)

    • B. 

      Malate to Oxaloacetate (Step 8)

    • C. 

      Acetyl-CoA and oxaloacetate to citrate (Step 1)

    • D. 

      Alpha-ketoglutarate to succinyl CoA (Step 4)

  • 36. 
    If the body needs ATP, it can be created from GTP during what step of the Krebs cycle?
    • A. 

      Fumarate to Malate

    • B. 

      Alpha-ketoglutarate to succinyl CoA

    • C. 

      Isocitrate to alpha-ketoglutarate

    • D. 

      Succinyl CoA to succinate

  • 37. 
    Energy is harvested in the form of FADH2 during what step(s) of the TCA cycle?
    • A. 

      Succinyl CoA to Succinate

    • B. 

      Alpha-ketoglutarate to Succinyl CoA

    • C. 

      Succinate to fumarate

    • D. 

      Fumarate to malate

    • E. 

      A and C

    • F. 

      None of the above

  • 38. 
    Which of the following is not a step of the TCA cycle where NADH or FADH2 is produced?
    • A. 

      Malate to oxaloacetate

    • B. 

      Isocitrate to Alpha-ketoglutarate

    • C. 

      Succinate to fumarate

    • D. 

      Fumarate to malate

  • 39. 
    In addition to NADH and FADH2, this gas is released in the TCA cycle:
    • A. 

      O2

    • B. 

      CO2

    • C. 

      NH3

    • D. 

      O3

  • 40. 
    • A. 

      0

    • B. 

      1

    • C. 

      2

    • D. 

      3

  • 41. 
    The irreversible steps of the TCA cycle are highly regulated. One irreversible step, the conversion of Acetyl-CoA and oxaloacetate to citrate would be inhibited by high levels of ________?
    • A. 

      Succinyl-CoA

    • B. 

      Citrate

    • C. 

      NADH

    • D. 

      ATP

    • E. 

      B,C,D

    • F. 

      All of the above

  • 42. 
    The electron transport chain is found along __________
    • A. 

      The matrix of the mitochondria

    • B. 

      The inner membrane of the mitochondria

    • C. 

      The outer membrane of the mitochondria

    • D. 

      The intermembrane space of the mitochondria

  • 43. 
    The electron transport chain is arranged in order of ____________ electron affinity with _____________ being the terminal electron acceptor
    • A. 

      Decreasing:H2O

    • B. 

      Increasing;H2O

    • C. 

      Increasing:O2

    • D. 

      Decreasing:NADH

  • 44. 
    Complex I of the electron transport chain transfers 2 electrons to UQ to form UQH2 (but first passing through FMN and heme groups). Where do these electrons originate from?
    • A. 

      NADH

    • B. 

      FADH2

    • C. 

      ATP

    • D. 

      H2O

  • 45. 
    • A. 

      2

    • B. 

      1

    • C. 

      3

    • D. 

      4

  • 46. 
    Complex II contains what enzyme also found in the citric acid cycle?
    • A. 

      Isocitrate dehydrogenase

    • B. 

      NADH dehydrogenase

    • C. 

      Fumarase

    • D. 

      Succinate dehydrogenase

  • 47. 
    Like complex I, complex II also transfers electrons to UQ but they come from FADH2. What step of the krebs cycle is this FADH2 produced?
    • A. 

      Fumarate to malate

    • B. 

      Succinate to fumarate

    • C. 

      Isocitrate to alpha-ketoglutarate

    • D. 

      Succinyl-CoA to succinate

  • 48. 
    Complex III transfers electrons that were collected on UQH2 to ___________
    • A. 

      Cytochrome b1

    • B. 

      Cytochrome C

    • C. 

      Cytochrome P450

    • D. 

      CoQ10

  • 49. 
    After the transfer of electrons by complex III, ______ protons are released into the intermembrane space.
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      0

  • 50. 
    Complex IV of the electron transport chain is also called:
    • A. 

      Cytochrome oxidase

    • B. 

      Electron terminase

    • C. 

      Cytochrome b1 complex

    • D. 

      Cytochrome c complex

  • 51. 
    Each NADH molecule can produce _______ ATP per electron pair, while each FADH2 can only produce _______ ATP per electron pair.
    • A. 

      3;2

    • B. 

      1.5;1

    • C. 

      2.5;1.5

    • D. 

      4;2

  • 52. 
    Which of these would inhibit the electron transport chain?
    • A. 

      Antimycin

    • B. 

      Carbon monoxide

    • C. 

      Cyanide

    • D. 

      All of the above

  • 53. 
    • A. 

      Mitchell Peter

    • B. 

      Michelle Peter

    • C. 

      Michael Pete

    • D. 

      Peter Mitchell

  • 54. 
    The structure that monitors ADP/ATP ratio and exchanges ADP and ATP in the matrix is called _____________
    • A. 

      ATP exchangase

    • B. 

      ADP-ATP recipricator

    • C. 

      ADP transferase

    • D. 

      ADP-ATP Translocator

  • 55. 
    • A. 

      2

    • B. 

      4

    • C. 

      6

    • D. 

      8

  • 56. 
    NADH is produced during glycolysis, but its electrons can't reach the inner membrane of the mitochondria without the help of what mechanism(s)?
    • A. 

      Glycerol phosphate shuttle

    • B. 

      Triglyceride Shuttle

    • C. 

      Malate aspartate shuttle

    • D. 

      Alpha-ketoglutarate shuttle

    • E. 

      A and C

    • F. 

      B and D

  • 57. 
    The glycerol phosphate shuttle ultimately transfers the electrons from NADH to _________ , which is then oxidized by the ETC.
    • A. 

      Glycerol 3 phosphate

    • B. 

      Succinate

    • C. 

      NAD

    • D. 

      FAD

  • 58. 
    From one molecule of glucose, assuming that NADH from glycolysis was transferred to the ETC by the malate-aspartate shuttle, oxidative phosphorylation can produced _________ ATP.
    • A. 

      16

    • B. 

      31

    • C. 

      36

    • D. 

      Unllimited

  • 59. 
    NADH that is already in the matrix from the citric acid cycle is going to make ____ATP per molecule, while NADH that has to be shuttled in via Malate-aspartate shuttle will only produce ______ ATP per molecule.
    • A. 

      3; 1

    • B. 

      2.5; 2.25

    • C. 

      3 ;2

    • D. 

      2.5; 2

  • 60. 
    Which of the following does not have antioxidant activity?
    • A. 

      Glutathione Peroxidase

    • B. 

      Catalase

    • C. 

      Vitamin D

    • D. 

      Beta carotene

    • E. 

      Vitamin C

    • F. 

      Vitamin E

  • 61. 
     The beta carbon in a fatty acid is _____________
    • A. 

      The carbon of the carboxyl group

    • B. 

      Two carbons away from the omega carbon

    • C. 

      Two carbons away from the carboxyl group

    • D. 

      The terminal carbon

  • 62. 
    Which of the following is false concerning fatty acids?
    • A. 

      Cis fatty acids have a kink in their structure

    • B. 

      Saturated fatty acids contain one or more double bonds

    • C. 

      Fatty acids generally have an even number of carbons

    • D. 

      Saturated fatty acids have a higher melting point than unsaturated fatty acids

  • 63. 
    Alpha-linolenic acid contains the nomenclature (18:3w-3) suggesting that it is an omega-3 fatty acid. The 3 that follows the omega symbol (w), suggests
    • A. 

      The omega carbon is three carbons away from the carboxyl group

    • B. 

      There are three omega fatty acids attached to this molecule

    • C. 

      The closest double bond is 3 carbons from the omega carbon

    • D. 

      There are 3 omega carbons

  • 64. 
    Which of the following is the precursor for the omega-6 fatty acid family?
    • A. 

      Linoleic acid

    • B. 

      Alpha-linolenic acid

    • C. 

      Sphingolipids

    • D. 

      Triacylglycerols

  • 65. 
    Eicosanoids have how many carbons?
    • A. 

      3

    • B. 

      13

    • C. 

      20

    • D. 

      15

  • 66. 
    Eicosanoids are derived from ____________________
    • A. 

      Isoprenoids

    • B. 

      Arachadonic acid

    • C. 

      Terpenoids

    • D. 

      Eicosanates

  • 67. 
    _____________ is responsible for the conversion of eicosanoids to prostaglandins, promoters of inflammation.
    • A. 

      Lipoxygenases

    • B. 

      Free radical oxidation

    • C. 

      Prostaglandeicosactivase

    • D. 

      Cyclooxygenases

  • 68. 
    ________________ are called fats or oils depending on the temperature at which they exist.
    • A. 

      Triacylgyycerols

    • B. 

      Eicosanoids

    • C. 

      Phospholipids

    • D. 

      Phosphoglycerides

  • 69. 
    __________________ is the phosphoglyceride that acts as a surfactant in the alveoli. A lack of this can cause acute respiratory distress syndrome in children. 
    • A. 

      Trimannosylglucosamine

    • B. 

      Phosphoethanolamine

    • C. 

      Dipalmitoylphosphatidylcholine

    • D. 

      Ceramide

  • 70. 
    Each isoprene unit consists of _________ carbons
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      10

  • 71. 
    Arrange the following in order from highest to lowest density 1. LDL 2. HDL 3. VLDL 4. IDL 5. Chylomicrons
    • A. 

      1,5,3,2,5

    • B. 

      2,5,4,3,1

    • C. 

      2,1,4,3,5

    • D. 

      5,4,3,2,1

  • 72. 
    It is generally accepted that we should raise our levels of HDL for health benefits. Which of these provides the correct reasoning for this?
    • A. 

      HDL inhibits the production of LDL

    • B. 

      HDL blocks the receptors that take LDL into cell membranes

    • C. 

      HDL sends signals to the body to consume less fatty foods

    • D. 

      HDL scavenges excess cholesteryl esters and cholesterol and transports them back to the liver

  • 73. 
    Which of the following is false concerning lipid metabolism?
    • A. 

      Triacylglycerols are absorbed directly into the bloodstream through the digestive tract

    • B. 

      Triacylglycerol is broken down into two free fatty acids and monoacylglycerol

    • C. 

      Lipogenesis is promoted by insulin

    • D. 

      Lipogenesis occurs in the liver

  • 74. 
    Which of these does not occur in the mitochondria
    • A. 

      TCA cycle

    • B. 

      Beta oxidation

    • C. 

      Oxidative phosphorylation

    • D. 

      Glycolysis

  • 75. 
    The process of Beta-oxidation breaks down fatty acids 2 carbons at a time. These two carbons are released as _________
    • A. 

      Acetyl CoA

    • B. 

      Pyruvate

    • C. 

      CO2

    • D. 

      Oxaloacetate

  • 76. 
    For every acetyl-coa that is produced from the breakdown of lipids (beta oxidation), __________NADH and _________FADH2 are produced. 
    • A. 

      3;1

    • B. 

      2;3

    • C. 

      2;2

    • D. 

      1;1

  • 77. 
    • A. 

      Debranching enzyme

    • B. 

      Alpha oxidation

    • C. 

      Peroxisomal oxidation

    • D. 

      Ketosis

  • 78. 
    The biomolecule that helps to synthesize lipids by attaching to fatty acids via a thioester linkage is called: 
    • A. 

      Lipid synthase

    • B. 

      Acyl carrier protein (ACP)

    • C. 

      Thioester dehydrogenase

    • D. 

      Triglycerase

  • 79. 
    The homodimer with each unit containing 7 polypeptides that is responsible for the synthesis of fatty acids is called:
    • A. 

      Fatty acid synthase

    • B. 

      Fatty acid polymerase

    • C. 

      Lipase

    • D. 

      Liposynthase

  • 80. 
    Statins lower cholesterol by ______________
    • A. 

      Inhibiting HMG-CoA reductase

    • B. 

      Inducing HMG-CoA reductase

    • C. 

      Inhibiting HMG-CoA synthase

    • D. 

      Inducing HMG-CoA synthase

  • 81. 
    The process of converting squalene to cholesterol requires
    • A. 

      ATP

    • B. 

      NADPH

    • C. 

      FADH2

    • D. 

      GTP

  • 82. 
    Pregnenolone and __________ are the precursors of all of the other steroids
    • A. 

      Testosterone

    • B. 

      Estradiol

    • C. 

      Aldosterone

    • D. 

      Progesterone

  • 83. 
    Humans primarily use nitrogen in the form of ___________
    • A. 

      Urea

    • B. 

      Amino acids

    • C. 

      N2

    • D. 

      NH3

  • 84. 
    Plant sources are typically incomplete proteins, meaning that 
    • A. 

      They lack one or more essential amino acid

    • B. 

      They lack one or more non-essential acid

    • C. 

      They are low in glycine

    • D. 

      The amino acids they provide cannot be used by the body

  • 85. 
    Kwashiorkor refers to _______________________________
    • A. 

      A lack of vitamin C

    • B. 

      Hyperingestion of amino acids

    • C. 

      Positive nitrogen balance

    • D. 

      Insufficient protein

  • 86. 
    Transamination is performed by ________
    • A. 

      Amino acid symporters

    • B. 

      Amino acid tradesplaceases

    • C. 

      Aminotransferases

    • D. 

      Transfer aminase

  • 87. 
    Which of these is not a transamination pair?
    • A. 

      Pyruvate/alanine

    • B. 

      Aspartate/oxaloacetate

    • C. 

      Alpha-ketoglutarate/glutamate

    • D. 

      Acetyl-CoA/phenylalanine

  • 88. 
    Transamination reactions require a coenzyme PLP, which is made from _______________
    • A. 

      Vitamin B6

    • B. 

      Vitamin B12

    • C. 

      Vitamin C

    • D. 

      CoQ-10

  • 89. 
    Folate is
    • A. 

      Vitamin B6

    • B. 

      Vitamin B9

    • C. 

      Vitamin B12

    • D. 

      Vitamin D3

  • 90. 
    GABA's action is _____________
    • A. 

      An excitatory neurotransmitter

    • B. 

      A proton carrier molecule

    • C. 

      Enhanced by benzodiazepines

    • D. 

      An inhibitory neurotransmitter

    • E. 

      A and B

    • F. 

      C and D

    • G. 

      All of the above

  • 91. 
    Catecholamines, whose structure contains a benzene ring with two adjacent hydroxyl groups originates from what amino acid?
    • A. 

      Glutamate

    • B. 

      Tyrosine

    • C. 

      Arginine

    • D. 

      Lysine

  • 92. 
    Which of the following is false concerning amino acid metabolism?
    • A. 

      Histamine can stimulate the production of gastric acid

    • B. 

      Dopamine and norepinephrine are both excitatory neurotransmitters

    • C. 

      Purines are first produced and then linked to ribose phosphate

    • D. 

      Alkaloids include several addictive substances

  • 93. 
    Which of these is not a circumstance when protein turnover is favored in the body?
    • A. 

      Timely degradation of specific proteins (i.e Cyclin CDK)

    • B. 

      Accumulation of abnormal proteins

    • C. 

      Rapid changes in protein concentrations in the body

    • D. 

      Bulky hydrophobic groups attached N-terminal

    • E. 

      All of the above are circumstances where protein turnover is favored in the body

  • 94. 
    Which of the following is not an enzyme related to ubiquitination?
    • A. 

      Ubiquitin-activating enzyme

    • B. 

      Ubiquitin-terminating enzyme

    • C. 

      Ubiquitin ligase

    • D. 

      Ubiquitin-conjugating enzyme

  • 95. 
    Which of these is not a fate of amino acid degradation?
    • A. 

      Succinyl-CoA

    • B. 

      Oxaloacetate

    • C. 

      Alpha-ketoglutarate

    • D. 

      Glycerol-3-phosphate

  • 96. 
    MAOI's inhibit the __________ of catecholamines by Monoamine oxidase, which is why they are often used for depression.
    • A. 

      Deamination

    • B. 

      Synthesis

    • C. 

      Transport

    • D. 

      None of the above

  • 97. 
    Fatty acid synthesis takes place in the ___________, B-oxidation takes place in the _________
    • A. 

      Mitochondria;Mitochondria

    • B. 

      Mitochondria;cytoplasm

    • C. 

      Cytoplasm;mitochondria

    • D. 

      Cytoplasm;cytoplasm

  • 98. 
    Which of the following is involved in platelet aggregation?
    • A. 

      Leukotrienes

    • B. 

      Thromboxanes

    • C. 

      Prostaglandins

    • D. 

      Cholesterol

  • 99. 
    Which of these is not a component of cell membranes?
    • A. 

      Phospholipids

    • B. 

      Sphingolipids

    • C. 

      Cholesterols

    • D. 

      Eicosanoids

  • 100. 
    The synthesis of cholesterol begins with ____________
    • A. 

      Acetyl CoA

    • B. 

      Succinyl CoA

    • C. 

      Pyruvate

    • D. 

      Bile salts

  • 101. 
    Which one do you like?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 102. 
    Which one do you like?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4