NEET Biology PYQ QUIZ - Biomolecules AUGUST 11

Biology MCQ Test

Biomolecules, DNA & Cell Membrane

10 Questions

Instructions:
1. Select one answer for each question.
2. Click Submit Test after answering all questions.
3. Your score and the correct answers will be shown only after submission.
4. Correct answers are highlighted in green and incorrect selected answers in red.

1. One turn of the helix in a B-form DNA is approximately :-

(1) 20 nm (2) 0.34 nm (3) 3.4 nm (4) 2 nm

Correct Answer: (3) 3.4 nm

2. Antiparallel strands of a DNA molecule means that :-

(1) one strand turns anti-clockwise (2) the phosphate groups of two DNA strands, at their ends, share the same position (3) the phosphate groups at the start of two DNA strands are in opposite position (pole) (4) one strand turns clockwise

Correct Answer: (3) the phosphate groups at the start of two DNA strands are in opposite position (pole)

3. Antibodies in our body are complex :-

(1) Lipoproteins (2) Steroids (3) Prostaglandins (4) Glycoproteins

Correct Answer: (4) Glycoproteins

4. The two polynucleotide chains in DNA are :-

(1) Parallel (2) Discontinuous (3) Antiparallel (4) Semiconservative

Correct Answer: (3) Antiparallel

5. Which monosaccharide does not show optical isomerism?

(1) Dihydroxy acetone (2) Glyceraldehyde (3) Erythrose (4) Ribose

Correct Answer: (1) Dihydroxy acetone

6. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and :-

(1) Calcium and phosphorus (2) Phosphorus and sulphur (3) Sulphur and magnesium (4) Magnesium and sodium

Correct Answer: (2) Phosphorus and sulphur

7. Which one of the following is not a constituent of cell membrane?

(1) Phospholipids (2) Cholesterol (3) Glycolipids (4) Proline

Correct Answer: (4) Proline

8. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

(1) Guanine, Adenine – Purines (2) Adenine, Thymine – Purines (3) Thymine, Uracil – Pyrimidines (4) Uracil, Cytosine – Pyrimidines

Correct Answer: (2) Adenine, Thymine – Purines

9. In the DNA molecule :-

(1) the proportion of Adenine in relation to thymine varies with the organism (2) there are two strands which run antiparallel one in 5' → 3' direction and other in 3' → 5' (3) the total amount of purine nucleotides and pyrimidine nucleotides is not always equal (4) there are two strands which run parallel in the 5' → 3' direction

Correct Answer: (2) there are two strands which run antiparallel one in 5' → 3' direction and other in 3' → 5'

10. Which of the following bond is not related to nucleic acid?

(1) H-bond (2) Ester bond (3) Glycosidic bond (4) Peptide bond

Correct Answer: (4) Peptide bond