General Science – Biology MCQs

196. If Red blood cells is kept in distilled water what will happen?

(A) Shrink and collapse
(B) Stick together
(C) increase in volume and burst
(D) Remains same

Correct Answer: (C) increase in volume and burst

Answer Explanation:

Due to osmosis water would flow into the cells and they would swell

197. How many vertebrae does a human being have ?

(A) 33
(B) 36
(C) 29
(D) 19

Correct Answer: (A) 33

Answer Explanation:

The vertebral column usually consists of 33 vertebrae: 24 presacral vertebrae (7 cervical, 12 thoracic, and 5 lumbar) followed by the sacrum (5 fused sacral vertebrae) and the coccyx (4 frequently fused coccygeal vertebrae).

198. What fraction of Human Blood is Plasma?

(A) 35%
(B) 45%
(C) 50%
(D) 55%

Correct Answer: (D) 55%

Answer Explanation:

Blood plasma is the liquid component of whole blood, and makes up approximately 55% of the total blood volume. It is composed primarily of water with small amounts of minerals, salts, ions, nutrients, and proteins in solution. In whole blood, red blood cells, leukocytes, and platelets are suspended within the plasma.

199. A genetic code specifies how many kinds of amino acids?

(A) 12
(B) 15
(C) 20
(D) 25

Correct Answer: (C) 20

Answer Explanation:

There are as many as 100 thousand kinds of proteins that constitute the body, and these comprise only 20 kinds of amino acids in various combinations.

200. Which among the following function as locus of biochemical reactions?

(A) Cell plasma
(B) Cell membrane
(C) Cell walls
(D) None of the above

Correct Answer: (B) Cell membrane

Answer Explanation:

The cells membranes hold enzymes of sequential reactions in close proximity

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