346: Antigen is a substance which
(a) destroys harmful bacteria
(b) is used to treat poisoning
(c) lowers body-temperature
(d) stimulates formation of antibody
Explanation:
Antigen is a proteinaceous substance which, when introduced into the body stimulates antibody production. For example, if any virus or bacteria enters the body, the immunity system will be activated to produce antibodies.
347: Which among the following acts as a resistance against disease in the body?
(a) Vitamins
(b) Carbohydrates
(c) Red Corpuscles
(d) White Corpuscles
348: Which of the following features of DNA makes in uniquely suited to store and transmit genetic information from generation to generation ?
(a) Complementarity of the two stands
(b) Double helix
(c) Number of base-pairs per turn
(d) Sugar-phosphate backbone
Explanation:
Complementarity of the two strands of DNA makes it uniquely suited to store and transmit genetic information form generation to generation.
349: The American multinational company, Monsanto has produced an insect-resistant cotton variety that is undergoing field- trails in India. A toxin gene from which ONE of the following bacteria has been transferred to this transgenic cotton ?
(a) Bacillus subtilis
(b) Bacillus thurigiensis
(c) Bacillus amyloliquifanciens
(d) Bacillus globlii
Explanation:
A toxin gene Cry 1 Ac taken from Bacillus thuringiensis was transfered to cotton to produce a transgenic cotton called Bt cotton gives resistance to Lepidopteran insect pests especially Boll worms in cotton.
350: Match List I with List II and select the correct answer using the codes given below the Lists :
List I List II
(Bone) (Name)
I. Breast-bone (A) Clavicle
II. Collar-bone (B) Patella
III. Knee-cap (C) Scapula
IV. Shoulder blade (D) Sternum
Codes:
(a) I-D, II-A, III-C, IV-B
(b) I-A, II-D, III-C, IV-B
(c) I-A, II-D, III-B, IV-C
(d) I-D, II-A, III-B, IV-C