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NBCE-Irene questions > Biochemistry Practice Test 2 > Flashcards

Biochemistry Practice Test 2 Flashcards

1
Q
  1. Which of the following cannot cross the cell membrane?
    a. Malate
    b. Oxaloacetate
    c. ADP
    d. Citrate
A

c. ADP

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2
Q
  1. Which of the following is the end product of purine metabolism?
    a. Urea
    b. Uric acid
    c. Hypoxanthine
    d. Xanthine
A

b. Uric acid

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3
Q
  1. 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
A

d. Xanthine oxidase

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4
Q
  1. Which of the following is an essential amino acid?
    a. Arginine
    b. Alanine
    c. Tyrosine
    d. Glycine
A

a. Arginine

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5
Q
  1. What type of fat can your body make?
    a. Linoleic
    b. Linolenic
    c. Arachidonic
    d. Palmitic
A

d. Palmitic

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6
Q
  1. Flax seed is an excellent source of:
    a. Alpha linolenic acid
    b. Gamma linolenic acid
    c. Linoleic acid
    d. Arachidonic acid
A

a. Alpha linolenic acid

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7
Q
  1. Which of the following is the nitrogen donor in the urea cycle?
    a. Glutamate
    b. Aspartate
    c. Valine
    d. Leucine
A

a. Glutamate

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8
Q
  1. Methionine is the limiting amino acid in:
    a. Legumes
    b. Chicken
    c. Egg
    d. Grains
A

a. Legumes

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9
Q
  1. Which of the following is an intermediate of the urea cycle?
    a. Pyruvate
    b. Citrate
    c. Citrulline
    d. Malate
A

c. Citrulline

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10
Q
  1. Serotonin is derived from which of the following?
    a. Tyrosine
    b. Tryptophan
    c. Melatonin
    d. Phenylalanine
A

b. Tryptophan

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11
Q
  1. 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
A

d Spontaneous and favorable

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12
Q
  1. The breakdown of lactose will yield:
    a. Glucose and glucose
    b. Glucose and galactose
    c. Glucose and fructose
    d. Amylose
A

b. Glucose and galactose

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13
Q
  1. 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
A

c. Beta 1-4

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14
Q
  1. 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

a. Alpha 1-4

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15
Q
  1. Which of the following cannot be broken down by humans?
    a. Amylose
    b. Lactose
    c. Maltose
    d. Cellulose
A

d. Cellulose

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16
Q
  1. 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
A

b. LDL

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17
Q
  1. Which of the following has the highest concentration within a chylomicron?
    a. Protein
    b. Cholesterol
    c. Triglycerides
    d. Phospholipids
A

c. Triglycerides

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18
Q
  1. 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
A

d. Alpha1-4 , Alpha 1-6

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19
Q
  1. This figure represents:
    a. Ketohexose
    b. Aldohexose
    c. Ketopentose
    d. Aldopentose
A

b. Aldohexose

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20
Q
  1. Patient with magenta tongue is most likely deficient in?
    a. Riboflavin
    b. Niacin
    c. Thiamine
    d. Pyridoxine
A

a. Riboflavin

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21
Q
  1. A patient that is experiencing dementia, dermatitis and diarrhea is most likely experiencing a ______ deficiency.
    a. B1
    b. B3
    c. B9
    d. B12
A

B3 (niacin)

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22
Q
  1. If you cannot convert pyruvate to alanine, which vitamin are you deficient in?
    a. B1
    b. B2
    c. B9
    d. B6
A

d. B6

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23
Q
  1. The ability to remove a carbon during a reaction requires:
    a. Biotin
    b. Thiamine
    c. Riboflavin
    d. Niacin
A

b. Thiamine

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24
Q
  1. Oxidation/reduction reactions require which of the following?
    a. Thiamine
    b. Pyridoxine
    c. Niacin
    d. Biotin
A

c. Niacin

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

b. Glycine

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

d. Vitamin C

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

d. Hydroxylation

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

c. Liver

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

b. Decrease Vmax

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

a. Inner mitochondrial membrane

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

c. 3

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

d. 12

33
Q
  1. 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

a. 1

34
Q
  1. 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
A

b. More; hydrogen ions

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

b. B9

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

d. Homocysteine

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

a. HMP shunt

38
Q
  1. 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

a. Oxaloacetate to phosphoenolpyruvate

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

c. Aspartate

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

d. Pyruvate

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

b. Oxaloacetate

c. ADP

42
Q
  1. 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

a. Citrate

43
Q
  1. 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
A

b. Cannot synthesize proteins

44
Q
  1. 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
A

d. tRNA

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

d. Citrate

46
Q
  1. 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
A

c. Vitamin D

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

c. ½ Vmax

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

a. Pantothenic acid

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

d. Niacin

50
Q
  1. 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

a. Due to beta 1-4 linkages

51
Q
  1. 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

a. 7-dehydrocholesterol to vitamin D3

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

b. HGM CoA reductase

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

a. Cytochromes

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

b. Coconut

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

a. Carnitine

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

a. 7.4

57
Q
  1. 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

a. CO2

58
Q
  1. 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
A

c. Glucose-6-P dehydrogenase

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

a. Carbamoyal-P-synthase

60
Q
  1. 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
A

b. Excreted as urea

NBCE-Irene questions (12 decks)

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