| 1. | In a DNA molecule cytosine is 18%. Percentage of adenine would be (a) 32% (b) 64% (c) 36% (d) 18% | Answer: (a) |
| 2. | In AGCT of DNA hydrogen bonds and base pairings occur between (a) A-U, C-G (b) A-C, G-T (c) A-G,C-T (d) A-T,C-G | Answer: (d) |
| 3. | In callus culture, roots can be induced by the supply of (a) Auxin and no cytokinin (b) Higher concentration of auxin and lower concentration of cytokinin (c) Higher concentration of cytokinin and lower concentration of auxin (d) Both auxin and cytokinin in equal proportions. | Answer: (b) |
| 4. | In DNA, adenine pairs with (a) Guanine (b) Thymine (c) Cytosine (d) Uracil | Answer: (b) |
| 5. | In DNA, guanine lies opposite (a) Uracil (b) Cytosine (c) Adenine (d) thymine | Answer: (b) |
| 6. | In double helix of DNA, the two DNA strands are (a) Coiled around a common axis (b) coiled around each other (c) coiled differently (d) Colied over protein sheath | Answer: (a) |
| 7. | In RNA, thymine is replaced by (a) Adenine (b) Guanine (c) Cytosine (d) Uracil | Answer: (d) |
| 8. | In tissue / bacterial culture glassware and nutrients are sterilized through (a) Water bath at 200° C (b) Dry air oven at 200° C (c) Dehumidifire (d) Autoclave | Answer: (d) |
| 9. | In tissue culture, callus can be induced to form shoot or root by altering the ratio of (a) Auxin to cytokinin (b) Cytokinin to ethylene (c) Auxin to gibberellin (d) Gibberellin to cytokinin | Answer: (a) |
| 10. | Initiation codon of protein synthesis (in eucaryotes) is (a) GUA (b) GCA (c) CCA (d) AUG | Answer: (d) |
------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
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