191. Watson and Crick are famous for their discovery of
(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
Correct Answer: [D] Fungi.
193. RNA of a retrovirus can produce DNA by
(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
Correct Answer: [B] Thymine and Cytosine.
195. One turn of DNA helix measures
(A) 24A°
(B) 44A°
(C) 34A°
(D) 3.4A°
Correct Answer: [C] 34A°.
196. The tasar silk fiber is produced by
(A) Philosomia ricini
(B) Antheraea assamensis
(C) Antheraea mylitta
(D) Bombyx mor
Correct Answer: [C] Antheraea mylitta.
197. Which of the following can indicates the air pollution of an area?
(A) Bacteria
(B) Algae
(C) Fungus
(D) Mosses
Correct Answer: [D] Mosses.
198. Which is not true for bio-fertilizer?
(A) Release nitrogen more slowly
(B) Does not badly affect the pH of the soil.
(C) More efficient than chemical fertilizer
(D) It is eco-friendly
Correct Answer: [C] More efficient than chemical fertilizer.
199. Which of the following isotope is used for the treatment of thyroid?
(A) I-313
(B) Co-60
(C) P-32
(D) C-14
Correct Answer: [A] I-313.
200. The metallic component of chlorophyll
(A) Mn
(B) Mg
(C) C
(D) N
Correct Answer: [B] Mg.
Explanation: Formula of chlorophyll C-55 H-72 O-5 N-4 Mg
Explanation: Formula of chlorophyll C-55 H-72 O-5 N-4 Mg
You can download objective (MCQ) questions and answers on Biology in PDF format for off-line study. You can also download study materials for WBCS prelims and main from the Study Material section.
0 Comments:
Post a Comment