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.
Class of carbohydrate which cannot be hydrolyzed further, is known as?
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
What is present in the stomach to prevent self-digestion?
Saliva contains all of the following except
C. bacteria-killing enzymes
Hexokinase activity in glycolysis is inhibited by
A. glucose 6- phosphate
B. fructose 6-phosphate
C. fructose 1,6 biphosphate
The ultimate source of energy that sustains living systems is
D. carbon dioxide
Name the major storage form of carbohydrates in animals?
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
During vigorous exercise, pyruvate produced by glycolysis is converted to
C. monosodium phosphate
D. pyruvic acid
Which of the following is not involved in the biosynthesis of DNA?
A. Energy from ATP
C. Carbonic anhydrase
The conversion of pyruvate to lactate is catalysed by
A. pyruvate carboxylase
B. lactate dehydrogenase
C. pyruvate dismutase
D. pyruvate decarboxylase
Which of the following is not a disaccharide?
D. None of these
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
The NAG6 substrate is hydrolyzed by human lysozyme to form
A. 6 glucosamines + 6 acetic acids
B. NAG4 + NAG2
C. NAG3 + NAG3
A catabolic intermediate which stimulates phosphofructokinase would stimulate
C. glycogen synthesis
D. none of these
Cellulose fibers resemble with the protein structure in the form of
D. None of these
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
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
The cells dependent solely on glucose as an energy source are
A. muscle cells
B. brain cells
C. kidney cells
D. liver cells
Which of the following is also known as invert sugar?
What is the name of the drug which inhibits Na+/K+ pump across the cell membrane?
Pyruvate is initially converted to which of the following in the gluconeogenesis?
B. Phosphoenol pyruvate
D. Acetyl CoA
Which of the following compounds is responsible for coordinated regulation of glucose and glycogen metabolism?
B. Fructose 2,6 bisphosphate
D. Fructose 1,6 bisphosphate
Storage polysaccharide made by animals is
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
Humans are unable to digest
B. complex carbohydrates
C. denatured proteins
The production or break down of __________ is often coupled with the metabolic reactions of biosynthesis and catabolism.
Which class of carbohydrates is considered as non-sugar?
Which of the following can act as precursors for gluconeogenesis?
D. All of these
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
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
A. stimulates gluconeogenesis and glycolysis
B. stimulates gluconeogenesis and inhibits glycolysis
C. inhibits gluconeogenesis and glycolysis
D. inhibits gluconeogenesis and stimulates glycolysis
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)
The sugar which forms major component of nucleic acids is
The main site for gluconeogenesis is
Carbohydrates are also known as___________
A. Hydrates of carbon
Fructose is metabolized by
A. fructose 1-phosphate pathway
B. fructose 6-phosphate pathway
C. glyceraldehyde 3-phosphate pathway
D. both (a) and (b)
How many ATP equivalents per mole of glucose input are required for gluconeogenesis?
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
Hydrolysis of lactose yields
A. galactose and fructose
B. galactose and glucose
C. glucose and fructose
D. fructose and galactose
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
Which of the following amino sugar are present in the bacterial cell wall?
A. N-acetylmuramic acid
B. Sialic acid
A molecule of amylopectin which contains 1500 glucose residues and is branched after every 30 residues. How many reducing ends are there?
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
a-amylose is similar to
B. β-turned coils
D. the hydrophobic core
Under aerobic condition pyruvate is converted by pyruvate dehydrogenase to
A. phosphoenol pyruvate
B. acetyl CoA
D. glyceraldehyde 3 phosphate
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
Citric acid accumulation would
A. stimulate phosphofructokinase activity
B. stimulate fructose 1,6 diphosphatase activity
C. inhibit phosphofructokinase activity
D. both (b) and (c)
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
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