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Carbohydrate MCQ Questions & Answers

Carbohydrate MCQs : This section focuses on the "Carbohydrate". These Multiple Choice Questions (MCQs) should be practiced to improve the Carbohydrate skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Class of carbohydrate which cannot be hydrolyzed further, is known as?

A. Disaccharides
B. Polysaccharides
C. Proteoglycan
D. Monosaccharide

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Question 2

Glucagon and epinephrine

A. inhibits gluconeogenesis and stimulates glycolysis
B. stimulates gluconeogenesis and glycolysis
C. stimulates gluconeogenesis and inhibits glycolysis
D. inhibits gluconeogenesis and glycolysis

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Question 3

What is present in the stomach to prevent self-digestion?

A. Mucus
B. acid
C. Enzymes
D. hormones

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Question 4

Saliva contains all of the following except

A. hormones
B. amylase
C. bacteria-killing enzymes
D. antibodies

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Question 5

Hexokinase activity in glycolysis is inhibited by

A. glucose 6- phosphate
B. fructose 6-phosphate
C. fructose 1,6 biphosphate
D. phosphofructokinase

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Question 6

The ultimate source of energy that sustains living systems is

A. glucose
B. oxygen
C. sunlight
D. carbon dioxide

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Question 7

Name the major storage form of carbohydrates in animals?

A. Cellulose
B. Chitin
C. Glycogen
D. Starch

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Question 8

Which of the following is carried out when cAMP functions as a second messenger?

A. Acts second in importance to AMP
B. Activates all cytosolic protein kinases
C. Activates the cAMP-dependent protein kinase
D. Acts outside the cell to influence cellular processes

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Question 9

During vigorous exercise, pyruvate produced by glycolysis is converted to

A. acetate
B. lactate
C. monosodium phosphate
D. pyruvic acid

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Question 10

Which of the following is not involved in the biosynthesis of DNA?

A. Energy from ATP
B. Mononucleotides
C. Carbonic anhydrase
D. Enzymes

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Question 11

The conversion of pyruvate to lactate is catalysed by

A. pyruvate carboxylase
B. lactate dehydrogenase
C. pyruvate dismutase
D. pyruvate decarboxylase

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Question 12

Which of the following is not a disaccharide?

A. Amylose
B. Cellobiose
C. Lactose
D. None of these

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Question 13

Gluconeogenesis is the

A. formation of glycogen
B. breakdown of glucose to pyruvate
C. breakdown of glycogen to glucose
D. synthesis of glucose from non-carbohydrate precursors

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Question 14

The NAG6 substrate is hydrolyzed by human lysozyme to form

A. 6 glucosamines + 6 acetic acids
B. NAG4 + NAG2
C. NAG3 + NAG3
D. NAG3

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Question 15

A catabolic intermediate which stimulates phosphofructokinase would stimulate

A. gluconeogenesis
B. glycolysis
C. glycogen synthesis
D. none of these

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Question 16

Cellulose fibers resemble with the protein structure in the form of

A. β-sheets
B. α-helices
C. β-turns
D. None of these

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Question 17

Gluconeogenesis uses

A. 3 ATPs and 2 GTPs per glucose
B. 2 ATPs and 1 GTPs per glucose
C. 3 ATPs and 3 GTPs per glucose
D. 4 ATPs and 2 GTPs per glucose

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Question 18

Gluconeogenesis requires a higher amount of ATP equivalents as compared to that produced by glycolysis because

A. gluconeogenesis releases energy as heat
B. glycolysis releases energy as heat
C. glycolysis occurs in the mitochondria while gluconeogenesis occurs in the cytosol
D. all of the above

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Question 19

The cells dependent solely on glucose as an energy source are

A. muscle cells
B. brain cells
C. kidney cells
D. liver cells

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Question 20

Which of the following is also known as invert sugar?

A. Sucrose
B. Fructose
C. Dextrose
D. Glucose

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Question 21

What is the name of the drug which inhibits Na+/K+ pump across the cell membrane?

A. Taxol
B. Vinblastine
C. Quinone
D. Ouabain

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Question 22

Pyruvate is initially converted to which of the following in the gluconeogenesis?

A. Glycerol
B. Phosphoenol pyruvate
C. Oxaloacetate
D. Acetyl CoA

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Question 23

Which of the following compounds is responsible for coordinated regulation of glucose and glycogen metabolism?

A. NAD+
B. Fructose 2,6 bisphosphate
C. Acetyl-CoA
D. Fructose 1,6 bisphosphate

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Question 24

Storage polysaccharide made by animals is

A. amylopectin
B. glycogen
C. cellulose
D. collagen

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Question 25

Which of the following glycosidic linkage found in maltose?

A. Glucose (α-1 – 2β) Fructose
B. Glucose (α1 – 4) Glucose
C. Galactose (β1 – 4) Glucose
D. Glucose (β1 – 4) Glucose

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Question 26

Humans are unable to digest

A. starch
B. complex carbohydrates
C. denatured proteins
D. cellulose

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Question 27

The production or break down of __________ is often coupled with the metabolic reactions of biosynthesis and catabolism.

A. aspirin
B. DNA
C. ATP
D. CO2

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Question 28

Which class of carbohydrates is considered as non-sugar?

A. Monosaccharides
B. Disaccharides
C. Polysaccharides
D. Oligosaccharides

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Question 29

Which of the following can act as precursors for gluconeogenesis?

A. Lactate
B. Glycerol
C. Alanine
D. All of these

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Question 30

The conversion of pyruvate to oxaloacetate

A. requires biotin
B. involves the fixation of carbon dioxide
C. occurs in the mitochondria
D. all of the above

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Question 31

Which of the following statements about the energy needs of cells is false?

A. Without a continuous input of energy, cell disorder will increase
B. The laws of thermodynamics force cells to acquire energy
C. Many cellular reactions have an associated activation energy
D. The most usable energy for cells comes from the rapid combustion of glucose

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Question 32

Insulin

A. stimulates gluconeogenesis and glycolysis
B. stimulates gluconeogenesis and inhibits glycolysis
C. inhibits gluconeogenesis and glycolysis
D. inhibits gluconeogenesis and stimulates glycolysis

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Question 33

The glycosidic bond

A. in maltose is not hydrolyzed in lactose intolerant humans
B. in sucrose is hydrolyzed by bees
C. joins glucose and fructose to form sucrose
D. both (b) and (c)

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Question 34

The sugar which forms major component of nucleic acids is

A. ribose
B. galactose
C. mannose
D. maltose

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Question 35

The main site for gluconeogenesis is

A. kidney
B. liver
C. brain
D. muscle

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Question 36

Carbohydrates are also known as___________

A. Hydrates of carbon
B. Carbonates
C. Glycolipids
D. Polysaccharides

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Question 37

Fructose is metabolized by

A. fructose 1-phosphate pathway
B. fructose 6-phosphate pathway
C. glyceraldehyde 3-phosphate pathway
D. both (a) and (b)

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Question 38

How many ATP equivalents per mole of glucose input are required for gluconeogenesis?

A. 2
B. 6
C. 8
D. 4

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Question 39

Two major products of pentose phosphate pathway are

A. nicotinamide adenine dinucleotide and ribose 5-phosphate
B. flavine adenine dinuclueotide and glucose 5-phosphate
C. FAD and CoA
D. NADPH and NAD

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Question 40

Hydrolysis of lactose yields

A. galactose and fructose
B. galactose and glucose
C. glucose and fructose
D. fructose and galactose

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Question 41

Mark the INCORRECT statement about sugar alcohol?

A. Addition of -itol as a suffix
B. A linear molecule that cannot cyclize
C. Carbonyl groups reduced to a hydroxyl group
D. Terminal -OH group oxidizes

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Question 42

Which of the following amino sugar are present in the bacterial cell wall?

A. N-acetylmuramic acid
B. Sialic acid
C. Aminoglycoside
D. Azide

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Question 43

A molecule of amylopectin which contains 1500 glucose residues and is branched after every 30 residues. How many reducing ends are there?

A. 0
B. 1
C. 2
D. 5

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Question 44

Which of the following would be considered a part of metabolism?

A. Biosynthetic pathways that build DNA
B. Catabolic pathways that break down complex carbohydrates
C. The capture of light energy for use in making glucose
D. All of the above

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Question 45

a-amylose is similar to

A. β-sheets
B. β-turned coils
C. α-helices
D. the hydrophobic core

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Question 46

Under aerobic condition pyruvate is converted by pyruvate dehydrogenase to

A. phosphoenol pyruvate
B. acetyl CoA
C. lactate
D. glyceraldehyde 3 phosphate

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Question 47

In lysozyme catalysis, which of the following does not contribute?

A. The abnormally high pKa of Glu35
B. The strained conformation of the D sugar
C. Formation of a covalent intermediate at Asp52
D. Formation of a covalent intermediate at Ser195

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Question 48

Citric acid accumulation would

A. stimulate phosphofructokinase activity
B. stimulate fructose 1,6 diphosphatase activity
C. inhibit phosphofructokinase activity
D. both (b) and (c)

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Question 49

A common way that cells capture the energy released during the breakdown of large molecules is to add electrons to smaller, specialized molecules that can accept them. This process of electron acceptance is otherwise known as

A. biosynthesis
B. metabolism
C. reduction
D. catalysis

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Question 50

Boat and chair conformations are found

A. in pyranose sugars
B. in any sugar without axial -OH groups
C. in any sugar without equatorial -OH groups
D. only in D-glucopyranose

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