Biomolecules — Page 4 | NEET Biology

Q31

The four elements making 99% of living system are

A C, H, O, S

B C, H, O, P

C C, H, O, N

D C, N, O, P

Correct Answer

Option C

Solution

(c) Principal elements include oxygen, carbon, hydrogen and nitrogen comprising 99% of living system.

Q32

Most diverse macromolecules found in the cell both physically and chemically are

A proteins

B carbohydrates

C nucleic acids

D lipids

Correct Answer

Option A

Solution

(a) Proteins are polymers of 20 amino acids that can be arranged in different orders to form a wide array of proteins.

Q33

Most abundant organic compound on earth is

A Protein

B Cellulose

C Lipids

D Steroids

Correct Answer

Option B

Solution

(b) Cellulose is the most abundant organic compound and biopolymer found on earth.

Q34

Carbohydrates, the most abundant biomolecules 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

Correct Answer

Option A

Solution

(a) Some bacteria (photosynthetic), algae and green plants produce carbohydrates.

Q35

Enzymes, vitamins and hormones share in common that they

A help in regulating metabolism

B are exclusively synthesized in the body of a living organism

C are conjugated protein molecules

D enhance oxidative metabolism

Correct Answer

Option A

Solution

(a) Enzymes, vitamins and hormones all help in regulating metabolism.

Q36

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

Correct Answer

Option C

Solution

(c) Calcium and phosphorus are the remaining elements that make up 98% of living organisms.

Q37

The two functional groups characteristic of sugars are

A Hydroxyl and methyl

B Carbonyl and methyl

C Carbonyl and hydroxyl

D Carbonyl and phosphate

Correct Answer

Option C

Solution

(c) Sugar is a carbohydrate containing carbonyl and hydroxyl groups.

Q38

Identify the substances having glycosidic bond and peptide bond, respectively in their structure

A Glycerol, trypsin

B Cellulose, lecithin

C Inulin, insulin

D Chitin, cholesterol

Correct Answer

Option C

Solution

(c) Inulin has glycosidic bond between adjacent fructose units. Insulin is a protein with peptide bonds.

Q39

Enzymes having slightly different molecular structure but performing identical activity are

A Holoenzymes

B Isoenzymes

C Apoenzymes

D Coenzymes

Correct Answer

Option B

Solution

(b) Isoenzymes have slightly different molecular structure but similar catalytic function.

Q40

Enzymes enhance the rate of reaction by

A forming a reactant-product complex

B changing the equilibrium point of the reaction

C combining with the product as soon as it is formed

D lowering the activation energy of the reaction

Correct Answer

Option D

Solution

(d) Enzymes lower the requirement of activation energy.