Free MCQs & Online Quiz Practice for Exams

Q: Which of the following is a disaccharide?

A) Glucose

B) Lactose

C) Fructose

D) Galactose

Q: Which of the following has the greatest number of glycosidic bonds?

A) Glucose

B) Sucrose

C) Cellulose

D) Maltose

Q: The main component of cellular membrane is

A) Nucleic acid

B) Cellulose

C) Carbohydrates

D) Protein

Q: The kinds of amino acids which are involved in the synthesis of most proteins are

A) 20

B) 30

C) 40

D) 50

Q: Amino acids mainly differ from each other by the difference in their

A) R-group

B) Carboxyl group

C) Amino group

D) Alpha group

Q: Keratin is a type of protein found in

A) Silk fibre

B) Nails

C) Blood cells

D) Muscle cells

Q: DNA is more or less present in all the following EXCEPT

A) Nucleus

B) Chromosomes

C) Ribosome

D) Mitochondria

Q: In saturated fatty acids more hydrogen are not accommodated because of

A) Presence of single bonds between carbon atoms

B) Presence of double bonds between carbon atoms

C) Presence of triple bonds between carbon atoms

D) Absence of bond between carbon atoms

Q: Lipid molecules have the capacity to store double amount of energy as compared to same amount of carbohydrate because of high number of

A) C-C bonds

B) C-H bonds

C) C-N bonds

D) C-O bonds

Q: The 'tails' of the hydrocarbons in the phospholipid molecules orient away from water. Which of the following describes the tail's movement away from water?

A) Polar

B) Adhesive

C) Hydrophilic

D) Hydrophobic

Q: Lactose is a disaccharide formed by the formation of a glycosidic bond between glucose and

A) Glucose

B) Galactose

C) Sucrose

D) Fructose

Q: Ester linkage is a bond which involves a chemical reaction between

A) H₃PO₄ and COH

B) H₃PO₄ and CH

C) H₃PO₄ and COOH

D) H₃PO₄ and OH

Q: How many nitrogenous bases are involved in the formation of genetic codes?

A) 2

B) 3

C) 4

D) 5

Q: Which one enzyme catalyzes the oxidation-reduction reaction?

A) Oxygenases

B) Transmethylases

C) Lyases

D) Peptidases

Q: Enzyme catalyzing rearrangement of atomic groupings without altering molecular weight or number of atoms is

A) Ligase

B) Isomerase

C) Oxidoreductase

D) Hydrolase

Q: Enzymes are polymers of

A) Hexose sugar

B) Amino acids

C) Fatty acids

D) Inorganic molecules

Q: Which one forms the raw material for coenzymes?

A) Vitamins

B) Carbohydrates

C) Proteins

D) Metals

Q: What will happen to reaction if enzyme is added?

A) Rate of reaction decreases

B) Rate of reaction increases

C) No effect on the rate of reaction

D) Reaction is reversed

Q: What is induced fit hypothesis?

A) When enzyme changes shape due to absence of substrate

B) When enzyme does not change shape due to absence of substrate

C) When enzyme changes shape due to presence of substrate

D) When enzyme does not change shape due to presence of substrate

Q: Which enzyme digests egg albumin into peptides and amino acids best in alkaline conditions?

A) Catalase

B) Lipase

C) Pepsin

D) Trypsin