Biochemistry Practice Test 2 Flashcards by Elvis BoneCrusher

Which of the following cannot cross the cell membrane?
a. Malate
b. Oxaloacetate
c. ADP
d. Citrate

c. ADP

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Which of the following is the end product of purine metabolism?
a. Urea
b. Uric acid
c. Hypoxanthine
d. Xanthine

b. Uric acid

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Which of the following is the key enzyme is involved in purine breakdown?
a. Phosphofructokinase
b. Lipoprotein lipase
c. Acetyl CoA carboxylase
d. Xanthine oxidase

d. Xanthine oxidase

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Which of the following is an essential amino acid?
a. Arginine
b. Alanine
c. Tyrosine
d. Glycine

a. Arginine

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What type of fat can your body make?
a. Linoleic
b. Linolenic
c. Arachidonic
d. Palmitic

d. Palmitic

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Flax seed is an excellent source of:
a. Alpha linolenic acid
b. Gamma linolenic acid
c. Linoleic acid
d. Arachidonic acid

a. Alpha linolenic acid

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Which of the following is the nitrogen donor in the urea cycle?
a. Glutamate
b. Aspartate
c. Valine
d. Leucine

a. Glutamate

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Methionine is the limiting amino acid in:
a. Legumes
b. Chicken
c. Egg
d. Grains

a. Legumes

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Which of the following is an intermediate of the urea cycle?
a. Pyruvate
b. Citrate
c. Citrulline
d. Malate

c. Citrulline

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Serotonin is derived from which of the following?
a. Tyrosine
b. Tryptophan
c. Melatonin
d. Phenylalanine

b. Tryptophan

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If the DeltaG for a reaction is -4.2, which of the following best describes this type of reaction
a. At equilibrium
b. Endergonic reaction
c. Non-spontaneous and unfavorable
d Spontaneous and favorable

d Spontaneous and favorable

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The breakdown of lactose will yield:
a. Glucose and glucose
b. Glucose and galactose
c. Glucose and fructose
d. Amylose

b. Glucose and galactose

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What type of linkage is seen in lactose?
a. Alpha 1-4
b. Alpha 1-6
c. Beta 1-4
d. Alpha 1 – Beta 2

c. Beta 1-4

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The type of linkage in maltose is:
a. Alpha 1-4
b. Alpha 1-6
c. Beta 1-4
d. Alpha 1 – Beta 2

a. Alpha 1-4

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Which of the following cannot be broken down by humans?
a. Amylose
b. Lactose
c. Maltose
d. Cellulose

d. Cellulose

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Which of the following is made in the liver and carries cholesterol from the liver to the tissues?
a. HDL
b. LDL
c. VLDL
d. Chylomicrons

b. LDL

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Which of the following has the highest concentration within a chylomicron?
a. Protein
b. Cholesterol
c. Triglycerides
d. Phospholipids

c. Triglycerides

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Glycogen contains ______ and ______ linkages.
a. Beta 1-4 , Alpha 1-6
b. Alpha 1-4 , Beta 1-6
c. Beta 1-4 , Beta 1-6
d. Alpha1-4 , Alpha 1-6

d. Alpha1-4 , Alpha 1-6

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This figure represents:
a. Ketohexose
b. Aldohexose
c. Ketopentose
d. Aldopentose

b. Aldohexose

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Patient with magenta tongue is most likely deficient in?
a. Riboflavin
b. Niacin
c. Thiamine
d. Pyridoxine

a. Riboflavin

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A patient that is experiencing dementia, dermatitis and diarrhea is most likely experiencing a ______ deficiency.
a. B1
b. B3
c. B9
d. B12

B3 (niacin)

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If you cannot convert pyruvate to alanine, which vitamin are you deficient in?
a. B1
b. B2
c. B9
d. B6

d. B6

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The ability to remove a carbon during a reaction requires:
a. Biotin
b. Thiamine
c. Riboflavin
d. Niacin

b. Thiamine

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Oxidation/reduction reactions require which of the following?
a. Thiamine
b. Pyridoxine
c. Niacin
d. Biotin

c. Niacin

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25. The most abundant amino acid in collagen is: a. Proline b. Glycine c. Leucine d. Valine

b. Glycine

26. The formation of collagen requires s which of the following? a. Vitamin A b. Vitamin D c. Vitamin E d. Vitamin C

d. Vitamin C

27. The type of reaction that vitamin C is involved in is a: a. Decarboxylation b. Carboxylation c. Oxidation/reduction d. Hydroxylation

d. Hydroxylation

28. During the Cori cycle, lactate is converted into glucose in the: a. Muscle b. Heart c. Liver d. Kidney

c. Liver

29. What will happen with a non-competitive inhibitor? a. Increase Vmax b. Decrease Vmax c. Increase Km d. Decrease Km

b. Decrease Vmax

30. The electron transport chain is located on/in the: a. Inner mitochondrial membrane b. Mitochondrial matrix c. Cytosol side d. Nucleus

a. Inner mitochondrial membrane

31. How many ATP are generated for each NADH molecule going through the ETC? a. 1 b. 2 c. 3 d. 4

c. 3

32. Each acetyl CoA a. 6 b. 2 c. 24 d. 12

d. 12

33. If NADH gives 2 protons directly to oxygen, how many ATP are generated in the mitochondria via the ETC? a. 1 b. 2 c. 3 d. 4

a. 1

34. The intercristae space (space between inner and outer mitochondrial membrane) is ______ acidic than the matrix because these is more ______ in the intramitochindrial space than in the matrix. a. More; hydroxyl ions b. More; hydrogen ions c. Less; hydrogen ions d. Less; hydroxyl ions

b. More; hydrogen ions

35. If you have a build-up of homocysteine which of the following are deficient in? a. B3 b. B9 c. B6 d. B1

b. B9

36. The demethylation of methionine will form: a. Hypoxanthine b. Serotonin c. Melatonin d. Homocysteine

d. Homocysteine

37. NADPH for fatty acid biosynthesis is derived from the ______. a. HMP shunt b. Urea cycle c. Cori cycle d. Gluconeogenic pathway

a. HMP shunt

38. Which of the following steps will require a GTP? a. Oxaloacetate to phosphoenolpyruvate b. Oxaloacetate to citrate c. Pyruvate to oxaloacetate d. Malate to oxaloacetate

a. Oxaloacetate to phosphoenolpyruvate

39. Oxaloacetate is the ketoacid and ______ is the corresponding amino acid. a. Alanine b. Arginine c. Aspartate d. Glutamate

c. Aspartate

40. Alanine is converted into ______ which can then be converted into acetyl CoA. a. Oxaloacetate b. Citrate c. Alpha ketogluterate d. Pyruvate

d. Pyruvate

41. Which of the following cannot cross the cell membrane? a. Malate b. Oxaloacetate c. ADP d. Citrate

b. Oxaloacetate | c. ADP

42. Acetyl CoA which is the starting point for fatty acid synthesis is converted to ______ in order to leave the mitochondria. a. Citrate b. Carnitine c. Malate d. Alpha ketogluterate

a. Citrate

43. If an antibiotic blocks the tRNA molecule, which of the following will occur? a. Cannot synthesize DNA b. Cannot synthesize proteins c. Cannot synthesize carbohydrates d. Cannot synthesize fats

b. Cannot synthesize proteins

44. Which RNA molecule contains an acceptor arm that consists of a base paired stem that terminates in the sequence CCA (5’-3’)? a. mRNA b. rRNA c. sRNA d. tRNA

d. tRNA

45. Which of the following is not part of the urea cycle a. Arginine b. Citrulline c. Ornithine d. Citrate

d. Citrate

46. Which of the following aids in the formation of calcium binding protein at the interstitial level to absorb calcium? a. Vitamin A b. Vitamin C c. Vitamin D d. Vitamin E

c. Vitamin D

47. The michaelis manten constant is which of the following? a. 1/3 Vmax b. ¾ Vmax c. ½ Vmax d. ¼ Vmax

c. ½ Vmax

48. Which of the following causes the formation of coenzyme A? a. Pantothenic acid b. Folic acid c. Thiamine d. Riboflavin

a. Pantothenic acid

49. What vitamin is in the Kreb Cycle to help it go around? a. Biotin b. Folic acid c. Pyridoxine d. Niacin

d. Niacin

50. Why can you not breakdown cellulose? a. Due to beta 1-4 linkages b. Due to beta 1-6 linkages c. Due to alpha 1-4 linkages d. Due to alpha 1-6 linkages

a. Due to beta 1-4 linkages

51. When you go into sunlight, which of the following occurs? a. 7-dehydrocholesterol to vitamin D3 b. Vitamin D3 to 7-dehydrocholesterol c. Folic acid to cobalamin d. Cholesterol to cortisol

a. 7-dehydrocholesterol to vitamin D3

52. The rate limiting enzyme in cholesterol synthesis is: a. HGM CoA synthase b. HGM CoA reductase c. Phosphofructokinase d. Xanthine oxidase

b. HGM CoA reductase

53. The electron transport complexes are made up of which of the following? a. Cytochromes b. Transferases c. Sterols d. Liposomes

a. Cytochromes

54. Which of the following is the most saturated? a. Sunflower b. Coconut c. Safflower d. Corn

b. Coconut

55. Which of the following transports fatty acids into the mitochondria for beta-oxidation? a. Carnitine b. Citrate c. Oxaloacetate d. Malate

a. Carnitine

56. What is the normal pH of blood? a. 7.4 b. 6.8 c. 7.6 d. 7.9

a. 7.4

57. In order to go from Acetyl CoA to malonyl CoA, which of the follow is needed? a. CO2 b. H2O c. FADH2 d. NADPH

a. CO2

58. To go from G6P to ribose-5-P, which of the following is needed? a. Hexokinase b. Glucokinase c. Glucose-6-P dehydrogenase d. Pyruvate dehydrogenase

c. Glucose-6-P dehydrogenase

59. The rate limiting enzyme if the urea cycle is: a. Carbamoyal-P-synthase b. Phosphofructikinase c. Xanthine Oxidase d. HMG CoA Reductase

a. Carbamoyal-P-synthase

60. What happens to amines after protein is broken down for energy? a. Stored in liver b. Excreted as urea c. Excreted as uric acid d. Converted to glucose

b. Excreted as urea