Objective Questions

Question. The acid used for preliminary separation of biomolecule in a living tissue is
(a) trichlorobenzoic acid
(b) benzoic acid
(c) trichloroacetic acid
(d) acetic acid

Question. Which of the following is the example of acidic amino acid ?
(a) Lysine
(b) Glutamic acid
(c) Aspartic acid
(d) Both (b) and (c)

Question. The most basic amino acid is
(a) arginine
(b) histidine
(c) glycine
(d) glutamine

Question. The charged molecule which is electrically neutral is known as
(a) amino acid
(b) zwitterion
(c) amide
(d) peptide

Question. Which of the following is/are essential fatty acid(s)?
(a) Linoleic acid
(b) Linolenic acid
(c) Arachidonic acid
(d) All of these

Question. Glycerol is a
(a) tetrahydroxy propane
(b) trihydroxy propane
(c) trihydroxy butane
(d) tetrahydroxy butane

Question. Lecithin is a
(a) phospholipid
(b) carbohydrate
(c) protein
(d) amino acid

Statement Type Questions

Question. Which of the following statement is incorrect ?
(a) Long chain molecules of fatty acids are formed by polymerization of 2 carbon compounds.
(b) Lipid molecules are soluble in water.
(c) In lipid, R group may be –CH₃ group, –C₂H₅ group or higher number of –CH₂ group (1 to 19 carbon).
(d) Oils have lower melting temperature.

Question. Select the incorrect statement.
(a) Ribozymes are nucleic acids with catalytic power.
(b) Proteins are homopolymer made of amino acids.
(c) Inulin is a polymer of fructose.
(d) Glycogen is stored in liver and muscles.

Question. Which of the following statement is wrong regarding chitin?
(a) It is a storage of polysaccharide.
(b) It is a heteropolysaccharide.
(c) It is a constituent of arthropods and fungal cell wall.
(d) It is a second most abundant carbohydrate on earth.

Matching Type Questions

Question. Match column I (organic compound) with column II (examples) and choose the correct combination from the given options.

Column-I (Organic Compounds)	Column-II (Examples)
A. Fatty acid	I. Glutamic acid
B. Phospholipid	II. Tryptophan
C. Aromatic amino acid	III. Lecithin
D. Acidic amino acid	IV. Palmitic acid

(a) A – I; B – II; C – III, D – IV
(b) A – IV; B – III; C – II, D – I
(c) A – II; B – III; C – IV, D – I
(d) A – III; B – IV; C – I, D – II

Question. Match the protein given in column I with its function given in column II and choose the right option.

Column I (Proteins)	Column II (Functions)
A. Collagen	I. Glucose transport
B. Trypsin	II. Hormone
C. Insulin	III. Intercellular ground substance
D. GLUT-4	IV. Enzyme

(a) A – III; B – IV; C – II; D – I
(b) A – IV; B – I; C – II; D – III
(c) A – II; B – IV; C – I; D – III
(d) A – III; B – IV; C – I; D – II

Question. Match column I (category) with column II (secondary metabolites)and choose the correct option.

Column I (Category)	Column II (Secondary metabolites)
A. Pigments	I. Concanavalin A
B. Terpenoides	II. Monoterpenes, Diterpenes
C. Alkaloids	III. Morphine, Cadeine
D. Lectins	IV. Carotenoids, Anthocyanin

(a) A – IV; B – II; C – III; D – I
(b) A – IV; B – III; C – II; D – I
(c) A – I; B – IV; C – III; D – II
(d) A – I; B – III; C – II; D – IV

Question. Match column I (function) with column II (Types of enzymes) and select the correct option.

Column I (Function)	Column II (Types of enzymes)
A. Enzymes catalysing breakdown without addition of water.	I. Isomerases
B. Enzyme catalyzes the conversion of an aldose sugar to a ketose sugar.	II. Oxidoreductase
C. Enzyme where catalysis involves transfer of electrons.	III. Ligases
D. Enzyme catalysing bonding of two components with the help of ATP.	IV. Lyases

(a) A – I; B – IV; C – III; D – II
(b) A – I; B – IV; C – II; D – III
(c) A – IV; B – I; C – II; D – III
(d) A – IV; B – I; C – III; D – II

Critical Thinking Type Questions

Question. According to weight percentage, the first three elements in human body are
(a) C > H > O
(b) C > O > N
(c) O > N > C
(d) O > C > H

Question. If all the peptide bonds of a protein are broken down, then what would remain?
(a) Amino acids
(b) Peptides
(c) Polypeptides
(d) Oligopeptides

Question. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
(a) base-sugar-phosphate.
(b) base-sugar-OH.
(c) (base-sugar-phosphate)n.
(d) sugar-phosphate.

Question. Which of the following is not an attribute of enzymes ?
(a) They are substrate specific in nature.
(b) They are proteinaceous in nature.
(c) They are used up in the reaction.
(d) They speed up rate of biochemical reaction.

Question. Carbohydrates, the most abundant biomolecule on earth, are produced by
(a) some bacteria, algae and green plant cells.
(b) fungi, algae and green plant cells.
(c) all bacteria, fungi and algae.
(d) viruses, fungi and bacteria.

Question. The effectiveness of an enzyme is affected least by
(a) temperature.
(b) concentration of the substrate.
(c) original activation energy of the system.
(d) concentration of the enzyme.

Question. The stored form of sugar in animal is a
(a) homopolysaccharide
(b) heteropolysaccharide
(c) oligosaccharide
(d) diasaccharide

Question. Transition state structure of the substrate formed during an enzymatic reaction is.
(a) permanent but unstable.
(b) transient and unstable.
(c) permanent and stable.
(d) transient but stable.

Diagram Type Questions

Question. What kinds of the structures of proteins are shown in the given figure (A, B, C and D)?

(a) A = 1º structure, B = 2º structure, C = 3º structure, D = 4º structure
(b) A = 4º structure, B = 2º structure, C = 3º structure, D = 1º structure
(c) A = 1º structure, B = 4º structure, C = 3º structure, D = 2º structure
(d) A = 4º structure, B = 3º structure, C = 2º structure, D = 1º structure

Question. The adjoining graph shows change in concentration of substrate on enzyme activity. Identify A, B and C.

Question. The given graph shows concept of activation energy with labelled 1, 2, 3, & 4. Co-relate the statements I, II, III & IV with 1, 2, 3 & 4.

I. Segment representing the energy of activation.
II. Segment representing the amount of free energy released by the reaction.
III. Transition state.
IV. Segment would be the same regardless of whether the reaction were uncatalysed or catalysed.

Question. The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration.) Identify the correct representation of two axes (x and y).

x – axis	y-axis
(a) Enzymatic activity	pH
(b) Temperature	Enzymatic activity
(c) Substrate concentration	Enzymatic activity
(d) Enzymatic activity	Temperature

Question. The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme greengram-phosphatase. What does the graph indicate?

(a) The rate of enzyme reaction is directly proportional to the substrate concentration.
(b) Presence of an enzyme inhibitor in the reaction mixture.
(c) Formation of an enzyme-substrate complex.
(d) At higher substrate concentration the pH increases.