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NBCE-Irene questions > Biochemisty Practice Test 1 > Flashcards

Biochemisty Practice Test 1 Flashcards

1
Q
  1. Cereal generally have low concentrations of which amino acid?
    a. Mathionine
    b. Valine
    c. Lysine
    d. Isoleucine
A

c. Lysine

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2
Q
  1. Which complex of the electron transport system contains copper?
    a. NADH dehydrogenase
    b. Succinate dehydrogenase
    c. Ubiquinol-cytochrome C oxidoreductase
    d. Cytochrome c oxidase
A

d. Cytochrome c oxidase

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3
Q
  1. Which enzyme is controlled via product inhibition and allows skeletal muscle cells to accumulate glucose?
    a. Hexokinase
    b. Glucokinase
    c. Pyruvate kinase
    d. Phosphofructokinase
A

d. Phosphofructokinase

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4
Q
  1. Which of these actions occurs during the alanine cycle?
    a. Pyruvate is converted to glucose in the liver
    b. Pyruvate is transaminated to glutamate in the liver
    c. Pyruvate is transported from skeletal muscle to the liver
    d. Gluconeogenesis occurs the in the skeletal muscles
A

a. Pyruvate is converted to glucose in the liver

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5
Q
  1. The malic enzyme catalyzes the conversion of malate to pyruvate and provides which substances used in fatty acid biosynthesis?
    a. Oxaloacetate
    b. NADPH
    c. Acetyl CoA
    d. NADH
A

b. NADPH

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6
Q
  1. Which of these foods are the richest source of vitamin E?
    a. Red meat
    b. Vegetable oils
    c. Fruits
    d. Fish
A

b. Vegetable oils

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7
Q
  1. The hydrolysis of amylopectin by amylase results in what end product?
    a. Amylose
    b. Cellulose
    c. Fructose
    d. Limit dextrin
A

a. Amylose

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8
Q
  1. Which hormone enhances the activity of glycogen phosphorylase in skeletal muscle?
    a. Epinephrine
    b. Testosterone
    c. Estrogen
    d. Aldosterone
A

a. Epinephrine

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9
Q
  1. Glucose precursors are primarily derived from ______.
    a. Cholesterol
    b. Sterols
    c. Amino acids
    d. Ketone bodies
A

c. Amino acids

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10
Q
  1. What is the principal carbohydrate produced by the action of alpha-amylase on dietary starch?
    a. Alpha-amylose
    b. Fructose
    c. Amylopectin
    d. Maltose
A

d. Maltose

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11
Q
  1. Amino acids derived from proteins (or fatty acids) are catabolized to products which directly enter the ______ for further oxidation to carbon dioxide?
    a. Pentose-phosphate pathway (HMP shunt only)
    b. Electron transport system (NADPH and FADH only)
    c. Glycolytic pathway (Proteins don’t enter here)
    d. Tricarboxylic acid cycle (AKA. Kreb cycle or CAC cycle)
A

d. Tricarboxylic acid cycle (AKA. Kreb cycle or CAC cycle)

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12
Q
  1. The enzymes that catalyze the breakdown of maltose are secreted by the mucosal cells of the ______.
    a. Mouth
    b. Stomach
    c. Small intestine
    d. Pancreas
A

c. Small intestine

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13
Q
  1. Which type of fatty acid is most abundant in olive oil?
    a. Saturated
    b. Monounsaturated
    c. Short chain
    d. Polyunsaturated
A

b. Monounsaturated

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14
Q
  1. A lack of lipoprotein lipase results in ______.
    a. A decrease in free fatty acids released by chylomicrons
    b. An elevated level of chylomicrons following a high fat meal
    c. Overproduction of low-density lipoproteins
    d. Overproduction of high-density lipoproteins
A

b. An elevated level of chylomicrons following a high fat meal

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15
Q
  1. When 2 molecules of oxaloacetate are converted to glucose, the energy equivalent of ______ ATP’s is required, and ______ molecules of CO2 are produced.
    a. 2; 4
    b. 6; 12
    c. 6; 6
    d. 2; 2
A

d. 2; 2

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16
Q
  1. The phosphatase groups of ATP are linked by ______ bonds.
    a. Phosphoanhydride
    b. Phosphate amide
    c. Disulfide
    d. Hydrogen
A

a. Phosphoanhydride

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17
Q
  1. Triacyloglycerols are transported from intestinal cells to adipose cells within ______.
    a. Chylomicrons
    b. VLDL’s
    c. LDL’s
    d. LHDL’s
A

a. Chylomicrons

18
Q
  1. What hormone increase the rate of many metabolic processes by increasing the activity of CAMP-dependent protein kinase?
    a. Estrogen
    b. Epinephrine
    c. Cortisol
    d. Aldosterone
A

b. Epinephrine

19
Q
  1. Dietary supplementation of therapeutic amounts of folic acid may be detrimental because it can ______.
    a. Cause kidney stones
    b. Mask a vitamin B-12 deficiency
    c. Damage to the liver
    d. Inhibit the absorption of other vitamins
A

b. Mask a vitamin B-12 deficiency

20
Q
  1. Which of these compounds is a simple sugar?
    a. Maltose
    b. Glycogen
    c. Dihydroxyacetone
    d. Cellulose
A

c. Dihydroxyacetone

21
Q
  1. What vitamin is synthesized by intestinal flora?
    a. A
    b. D
    c. E
    d. K
22
Q
  1. Which compound catalyzes the formation GTP in the tricarboxylic acid style?
    a. Succinate dehydrogenase
    b. Alpha-ketoglutarate dehydrogenase
    c. Malate dehydrogenase
    d. Succinate thiokinase
A

d. Succinate thiokinase

23
Q
  1. Which of these is a characteristic of myoglobin?
    a. It is a tetramer
    b. It is present in erythrocytes
    c. It has a fibrous quality
    d. It is a single polypeptide
A

d. It is a single polypeptide

24
Q
  1. Arginase catalyzes the enzymatic conversion of arginine into ______ and urea.
    a. Ornithine
    b. Alanine
    c. Lysine
    d. Methionine
A

a. Ornithine

25
Q
  1. Which of these is the C-4 epimer of glucose?
    a. Galactose
    b. Mannose
    c. Fructose
    d. Ribose
A

a. Galactose

26
Q
  1. Oxidation of which substance may result in ketone bodies?
    a. Maltose
    b. Fatty acids
    c. Glucose
    d. Aldehyde
A

b. Fatty acids

27
Q
  1. Which of these is a good source of omega-3 fatty acids?
    a. Shrimp
    b. Butter
    c. Salmon
    d. Chicken
28
Q
  1. Vitamin K is essential to the synthesis of which of these substances?
    a. Fibrinogen
    b. Hemoglobin
    c. Rhodopsin
    d. Prothrombin
A

d. Prothrombin

29
Q
  1. Dietary lipids are converted to ______ by pancreatic lipase.
    a. Lipoproteins
    b. Beta-monoacylglycerols
    c. Bile salts
    d. Cholesterol
A

b. Beta-monoacylglycerols

30
Q
  1. Which mineral is required for activity of most glycolytic enzymes?
    a. Copper
    b. Magnesium
    c. Cobalt
    d. Sulfur
31
Q
  1. Which of these is a characteristic of a spontaneous reaction?
    a. Standard free energy is positive
    b. An enzyme has catalyzed the reaction
    c. Gibbs’ free energy is negative
    d. Keq is greater than one
A

c. Gibbs’ free energy is negative

32
Q
  1. The bonding between the fatty acid and the glycerol in a 2-monoacyl-glycerol is best described as which of these?
    a. Glyosidic bond
    b. Ester linkage
    c. Peptide linkage
    d. Anhydride bond
A

b. Ester linkage

33
Q
  1. When the equilibrium constant for a reaction is equal to 1, then the standard free-energy charge for that reaction is ______.
    a. -1.36
    b. Zero
    c. 1.36
    d. 2.73
34
Q
  1. In the tricarboxylic acid cycle, isocitrate dehydrogenase converts isocitrate to ______.
    a. Fumarate
    b. Alpha ketoglutarate
    c. Succinyl-CoA
    d. Citrate
A

b. Alpha ketoglutarate

35
Q
  1. Which amino acid initiates protein synthesis in humans?
    a. Serine
    b. Methionine
    c. Leucine
    d. Isoleucine
A

b. Methionine

36
Q
  1. Which of these hormones affects both the anabolism and catabolism phases of proteins metabolism?
    a. Estrogen
    b. Glucagon
    c. Testosterone
    d. Glucocorticoids
A

d. Glucocorticoids

37
Q
  1. Which of these is a disaccharide with beta 1-4 bond?
    a. Lactose
    b. Maltose
    c. Sucrose
    d. Glucose
A

a. Lactose

38
Q
  1. Which of these factors characterizes gout?
    a. Purine overproduction
    b. Tyronase deficiency
    c. Adenine and guanine biosynthesis
    d. Urea cycle hyperactivity
A

a. Purine overproduction

39
Q
  1. If dietary intake of tryptophan is adequate, which vitamin can be produced?
    a. Thiamine
    b. Cyanocobalamin
    c. Niacin
    d. Pyridoxine
40
Q
  1. Which coenzyme is required for oxidative decarboxylation processes?
    a. Biotin
    b. Cobalamin
    c. Thiamine pyrophosphate
    d. Pyridoxal phosphate
A

c. Thiamine pyrophosphate

NBCE-Irene questions (12 decks)

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