Biology 39
191. Watson and Crick are famous for their discovery of
(A) Structure of DNA
(B) Antibodies
(C) Life history of Plasmodium Vivax
(D) Vaccinia
(A) Structure of DNA
(B) Antibodies
(C) Life history of Plasmodium Vivax
(D) Vaccinia
Correct Answer: [A] Structure of DNA.
192. The well-known antibiotic penicillin is obtained from this plant group:
(A) Lichen
(B) Angiosperm
(C) Algae
(D) Fungi
(A) Lichen
(B) Angiosperm
(C) Algae
(D) Fungi
Correct Answer: [D] Fungi.
193. RNA of a retrovirus can produce DNA by
(A) Endonuclease
(B) Reverse transcriptase.
(C) DNA polymerase
(D) RNA polymerase
(A) Endonuclease
(B) Reverse transcriptase.
(C) DNA polymerase
(D) RNA polymerase
Correct Answer: [B] Reverse transcriptase..
194. The Pyrimidine bases in a DNA are:
(A) Cytosine and Guanine
(B) Thymine and Cytosine
(C) Adenine and Guanine
(D) Thymine and Adenine
(A) Cytosine and Guanine
(B) Thymine and Cytosine
(C) Adenine and Guanine
(D) Thymine and Adenine
Correct Answer: [B] Thymine and Cytosine.
195. One turn of DNA helix measures
(A) 24A°
(B) 44A°
(C) 34A°
(D) 3.4A°
(A) 24A°
(B) 44A°
(C) 34A°
(D) 3.4A°
Correct Answer: [C] 34A°.
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