CBSE Class 11 Biology Biomolecules Assignments

Ques. Identify the basic amino acid from the following.
(a) Tyrosine (b) Glutamic Acid
(c) Lysine (d) Valine 

Answer: C

Ques. The two functional groups characteristic of sugars are
(a) hydroxyl and methyl
(b) carbonyl and methyl
(c) carbonyl and phosphate
(d) carbonyl and hydroxyl. 

Answer: D

Ques. A typical fat molecule is made up of
(a) one glycerol and one fatty acid molecule
(b) three glycerol and three fatty acid molecules
(c) three glycerol molecules and one fatty acid molecule
(d) one glycerol and three fatty acid molecules.

Answer: D

Ques. A phosphoglyceride is always made up of
(a) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(b) a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
(c) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(d) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached. 

Answer: A

Ques. Uridine, present only in RNA is a
(a) nucleoside (b) nucleotide
(c) purine (d) pyrimidine.

Answer: A

Ques. Which one of the following biomolecules is correctly characterized?
(a) Lecithin-a phosphorylated glyceride found in cell membrane.
(b) Palmitic acid - an unsaturated fatty acid with 18 carbon atoms.
(c) Adenylic acid - adenosine with a glucose phosphate molecule.
(d) Alanine amino acid - contains an amino group and an acidic group anywhere in the molecule.

Answer: A

Ques. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
(a) sulphur and magnesium
(b) magnesium and sodium
(c) calcium and phosphorus
(d) phosphorus and sulphur. 

Answer: D

Ques. Which of the following is the simplest amino acid?
(a) Alanine (b) Asparagine
(c) Glycine (d) Tyrosine 

Answer: A

Ques. The major role of minor elements inside living organisms is to act as
(a) co-factors of enzymes
(b) building blocks of important amino acids
(c) constituent of hormones
(d) binder of cell structure. 

Answer: A

Ques. Lipids are insoluble in water because lipid molecules are
(a) hydrophilic (b) hydrophobic
(c) neutral (d) zwitter ions. 

Answer: B

Ques. Spoilage of oil can be detected by which fatty acid?
(a) Oleic acid (b) Linolenic acid
(c) Linoleic acid (d) Erucic acid. 

Answer: D

Ques. Essential amino acid is
(a) phenylalanine (b) glycine
(c) aspartic acid (d) serine.

Answer: A

Ques. What are the most diverse molecules in the cell?
(a) Lipids (b) Mineral salts
(c) Proteins (d) Carbohydrates 

Answer: C

Ques. The four elements that make up 99% of all elements found in a living system are
(a) C, H, O and P (b) C, N, O and P
(c) H, O, C and N (d) C, H, O and S.

Answer: C

Ques. Amino acids are mostly synthesised from
(a) mineral salts (b) fatty acids
(c) volatile acids (d) α-ketoglutaric acid.

Answer: D

Ques. Living cell contains 60 – 95% water. Water present in human body is
(a) 60 – 65% (b) 50 – 55%
(c) 75 – 80% (d) 65 – 70%. 

Answer: D

Ques. Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their
(a) nutritive value (b) growth response
(c) defence action (d) effect on reproduction.

Answer: C

Ques. Concanavalin A is
(a) a pigment (b) an alkaloid
(c) an essential oil (d) a lectin. 

Answer: D

Ques. Which one of the following is the most abundant protein in the animals?
(a) Haemoglobin (b) Collagen
(c) Lectin (d) Insulin 

Answer: B

Ques. Which of the following glucose transporters is insulin-dependent?
(a) GLUT IV (b) GLUT I
(c) GLUT II (d) GLUT III 

Answer: A

Ques. Which one is the most abundant protein in the animal world?
(a) Trypsin (b) Haemoglobin
(c) Collagen (d) Insulin 

Answer: C

Ques. Which of the following have carbohydrate as prosthetic group?
(a) Glycoprotein (b) Chromoprotein
(c) Lipoprotein (d) Nucleoprotein 

Answer: A

Ques. Which one of the following statements is wrong?
(a) Uracil is a pyrimidine.
(b) Glycine is a sulphur containing amino acid.
(c) Sucrose is a disaccharide.
(d) Cellulose is a polysaccharide. 

Answer: B

Ques. The chitinous exoskeleton of arthropods is formed by the polymerisation of
(a) N - acetyl glucosamine
(b) lipoglycans
(c) keratin sulphate and chondroitin sulphate
(d) D - glucosamine. 

Answer: A

Ques. Which one of the following is a non - reducing carbohydrate?
(a) Maltose (b) Sucrose
(c) Lactose (d) Ribose 5-phosphate

Answer: B