PG NEET Biochemistry MCQs 18 – Carbohydrates

    1. Maximally absorbed substance in GIT is
      1. Glucose
      2. Fructose
      3. Pentose
      4. Galactose

    Ans(4)

    1. Cellulose is a
      1. Starch polysaccharide
      2. Non Starch polysaccharide
      3. Fructose polymer
      4. Glycosaminoglycan

    Ans(2)

    1. Reducing sugars are all except
      1. Glucose
      2. Sucrose
      3. Fructose
      4. Lactose

    Ans(2)

    1. Non reducing table sugar is
      1. Sucrose
      2. Glucose
      3. Maltose
      4. Fructose

    Ans(1)

    1. Which of the following is an aldose sugar?
      1. Ribulose
      2. Fructose
      3. Glyceraldehyde
      4. All of the above

    Ans(3)

    1. One gram of dietary fiber yields
      1. 2 calories
      2. 4 calories
      3. 0 calories
      4. 10 calories

    Ans(2)

    1. Dietary fiber is a
      1. Monosaccharide
      2. Disaccharide
      3. Polysaccharide
      4. Nonstarch polysaccharide

    Ans(4)

    1. Structurally, heparin is
      1. Homopolysaccharide
      2. Heteropolysaccharide
      3. Glycoprotein
      4. Mucoprotein

    Ans(b)

    1. Fiber requirement per day is
      1. 5 g/day
      2. 20 g/day
      3. 30 g/day
      4. 50 g/day

    Ans(c)

    1. Which of the following are Enantiomers?
      1. D Glucose and L glucose
      2. Glucose and galactose
      3. Glucose and mannose
      4. d glucose and I fructose

    Ans(a)

    1. If only one terminal aldehyde group of glucose is oxidized,
      1. Glucuronic acid
      2. Gluconic acid
      3. Gluchosaccharic acid
      4. Gluconolactone

    Ans(b)

    1. The conversion of an optically pure isomer (enantiomer) into a mixture of equal amounts of both Dextro and levo forms is called as:
      1. Polymerization
      2. Stereoisomerization
      3. Racemization
      4. Fractionation

    Ans(c)

    1. In malate shuttle, substance transported from mitochondria from mitochondria to the cytosol is
      1. Glycerophosphate
      2. Oxaloacetate
      3. Acetyl CoA
      4. Pyruvate

    Ans(b)

    1. Net ATP’s formed in glycolysis
      1. 5
      2. 7
      3. 10
      4. 15

    Ans(b)

    1. ATP’s are produced by RBC’s via
      1. Aerobic Glycolysis
      2. Anaerobic glycolysis
      3. Kreb’s Cycle
      4. Glycogenolysis

    Ans(b)

    1. The end product of glycolysis in RBC’s
      1. Pyruvate
      2. Acetyl CoA
      3. Lactic acid
      4. Oxaloacetate

    Ans(c)

    1. Citrate has an inhibitory effect on
      1. Glycogenesis
      2. Glycolysis
      3. Glycogenolysis
      4. Gluconeogenesis

    Ans(b)

    1. Number of ATP’s generated from one molecule of glucose in anerobic glycolysis
      1. 2
      2. 4
      3. 7
      4. 8

    Ans(2)

    1. PFK is allosterically activated by
      1. Fructose 1, 6 bisphosphate
      2. Fructose 2, 6 bisphosphate
      3. Phosphoenolpyruvate
      4. Pyruvate

    Ans(b)

    1. Substrate level phosphorylation is catalyzed by
      1. Succinate dehydrogenase
      2. Alpha ketoglutarate dehydrogenase
      3. Succinate thiokinase
      4. Malate dehydrogenase

    Ans(c)

    1. Lactate produced by glycolysis consumed in
      1. Gluconeogenesis & glycolysis
      2. Cori cycle & TCA cycle
      3. TCA cycle & Glycogenolysis
      4. Cori cycle only

    Ans(b)

    1. Postprandial utilization of glucose is mediated by
      1. Hexokinase
      2. Glycokinase
      3. Fructokinase
      4. All of above

    Ans(b)

    1. In glycolysis, inorganic phosphate is used by
      1. Glucose 6 phosphatase
      2. Phosphofructokinase
      3. Phosphoglycerate kinase
      4. Enolase

    Ans(c)

    1. Substrate level phosphorylation in glycolysis is catalyzed by
      1. Glyceraldehyde 3 phosphate dehydrogenase
      2. Pyruvate kinase
      3. Phosphofructokinase
      4. Enolase

    Ans(b)

    1. Fluoride ions act by inhibiting
      1. Enolase
      2. Hexokinase
      3. Cytochrome oxidase
      4. Carbonic anhydrase

    Ans(a)

    1. In glycolysis, the first committed step in catalyzed by
      1. 2,3 DPG
      2. Glycokinase
      3. Hexokinase
      4. Phosphofructokinase

    Ans(c)

    1. Which of the following anticoagulant used in estimating blood glucose prevents glycolysis?
      1. Oxalate
      2. Citrate
      3. Sodium flyoride
      4. Heparin

    Ans(c)

    1. Cancer cells derive nutrition from
      1. Glycolysis
      2. Oxidative phosphorylation
      3. Increase in mitochondria
      4. Glyconeogenesis

    Ans(a)

    1. Malate shuttle is important in
      1. Glycogenolysis
      2. Glycolysis
      3. Gluconeogenesis
      4. HMP shunt

    Ans(b)

    1. Malate – Aspartate shuttle is important in
      1. Glycogenolysis
      2. Glycolysis
      3. Gluconeogenesis
      4. HMP shunt

    Ans(c)

    1. True for malate shuttle
      1. Oxaloacetate is transported from mitochondria to cytoplasm
      2. Pyruvate is transported from the cytoplasm to mitochondria
      3. Malate is transported from mitochondria to cytoplasm
      4. Lactate is transported from the cytoplasm to mitochondria

    Ans(a)

    1. Crabtree effect is
      1. Cancer cells depend on glycolysis for ATP
      2. Inhibition of glycolysis by excessive oxygen
      3. Inhibition of oxygen consumption by the addition of glucose.
      4. All o f the above

    Ans(c)

    1. ATP’s synthesized in Rapaport Leubering cycle
      1. 0
      2. 32
      3. 28
      4. 4

    Ans(a)

    1. the step of glycolysis which required phosphate is
      1. Phosphofructokinase
      2. Glyceraldehyde 3 phosphate dehydrogenase
      3. Glucokinase
      4. Succinate dehydrogenase

    Ans(b)

    1. Total number of ATP’s gained per mol of glucose under aerobic conditions is
      1. 32
      2. 2
      3. 34
      4. 42

    Ans(32)

    1. Oxidation without oxygen leads to the formation of
      1. Pyruvate
      2. Fructose
      3. Lactate
      4. Acetone

    Ans(c)

    1. In malate shuttle, NADH produces how may ATP’s
      1. 1
      2. 5
      3. 2
      4. 5

    Ans(d)

    1. In the conversion of glucose to glucose 6 – phosphate in glycolysis true is
      1. Glucokinase has low km
      2. Hexokinase is found only in liver
      3. Glucokinase is induced by insulin
      4. Hexokinase is specific for glucose

    Ans(c)

    1. Immediate metabolic products during conversion of fructose 1, 6-bisphosphate to 2 molecules of pyruvate
      1. Glyceraldehyde 3 – phosphate and 1, 3-bisphosphoglycerate
      2. Dihydroxyacetone phosphate and 1, 3-bisphosphoglycerate
      3. Glyceraldehyde 3-phosphate and dihydroxyacetone phosphate
      4. 3 phosphoglycerate and 1, 3-bisphosphoglycerate

    Ans(c)

    1. The enzyme of glycolysis involved in the transfer of inorganic phosphate
      1. Enolase
      2. Aldolase
      3. Phosphoglycerate Mutase
      4. Glyceraldehyde – 3 phosphate dehydrogenase

    Ans(d)

    1. Which of the following enzyme does not catalyzes an irreversible step in glycolysis?
      1. Hexokinase
      2. Phosphoglycerate Kinase
      3. Pyruvate kinase
      4. Phosphofructokinase

    Ans(b)

    1. Number of ATP molecules and NADH formed in each cycle of glycolysis
      1. 4 ATP, 2 NADH
      2. 2 ATP, 2 NADH
      3. 4 ATP, 4 NADH
      4. 2 ATP, 4 NADH

    Ans(a)

43. The reaction catalysed by phosphofructokinase

  1. is activated by high concentration of ATP and citrate
  2. uses fructose 1 phosphate as substrate
  3. is the arte limiting reaction of the glycolytic pathway
  4. is near equilibrium is ost tissues

Ans (3)

44. Compared with the resting state vigorously contracting muscle shows

  1. an increased conversion of pyruvate to lactate
  2. decreased oxidation of pyruvate to CO2 and water
  3. a decreased NADH/NAD+ ratio
  4. a decreased concentration of AMP

Ans (1)

45. Which among the following controls is an allosteric inhibitor of TCA cycle

  1. pyruvate dehyrdrogenase
  2. keto glutarate dehydrogenase
  3. isocitrate dehydrogenase
  4. malate dehydrogenase

Ans (3)

46. Substrate level phosphorylation seen in reaction catalyzed in

  1. succinate dehydrigenase
  2. alfa ketoglutarate dehydrogenase
  3. succinyl CoA thiokinase
  4. malate dehydrogenase

Ans (3)

47. Flouride inhibits

  1. enolase
  2. pyruvate kinase
  3. LDH
  4. oxygenase

Ans (1)

48. Acetyl CoA can be converted into all of the following except

  1. glucose
  2. fatty acid
  3. cholesterol
  4. ketone bodeis

Ans (1)

49. In fasting state increased levels of alanine indicate

  1. increased breakdowwn of muscle protein
  2. decreased utilusation for gluconeogenesis
  3. leak of alanine through plasma membrane
  4. decreased uptake of alanine by liver for gluconeogenesis

Ans (1)

50. Major determinant factor in gluconeogenesis in liver depends on

  1. alanine
  2. leel of seeential fatty acid in liver
  3. ADP
  4. none

Ans (3)

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