| 1. | RNA that picks up specific amino acid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is (a) tRNA (b) mRNA (c) rRNA (d) gRNA | Answer: (a) |
| 2. | Semiconservative DNA / Chromosome replication using 14N was demonstrated by (a) Messelson (b) Tylor (c) Messelson and stahl (d) Hershey and Chase | Answer: (c) |
| 3. | Similarity between DNA and RNA is that both have (a) Similar sugars (b) Similar mode of replication (c) Similar pyrimidines (d) Polymers of nucleotides | Answer: (d) |
| 14. | Structure of DNA was given by (a) Kornberg (b) Nirenberg (c) Watson and Crick (d) Holley and Nirenberg | Answer: (c) |
| 15. | Successive nucleotides are covalently linked through (a) Glycosidic bonds (b) Phosphodiester bonds (c) Hydrogen bonds (d) Nitrogen bonds | Answer: (b) |
| 16. | Termination of polypeptide chain is brought about by (a) UUG, UAG and UCG (b) UAA, UAG and UGA (c) UUG, UGC and UCA (d) UCG, GCG and ACC | Answer: (b) |
| 7. | The basic uniot of a nucleic acid is (a) Pentose sugar (b) Nucleoid (c) Nucleoside (d) Nucleotide | Answer: (d) |
| 8. | The codon for anticodon 3’ UUUA – 5’ is (a) 5’ AAAU- 3’ (b) 5’ UUUA- 3’ (c) 3’ UAAD- 5’ (d) 3’ AUUU- 5’ | Answer: (a) |
| 9. | The common feature amongst nucleus, chloroplast and mitochondria is (a) Lamellae (b) DNA (c) Cristae (d) All the above | Answer: (b) |
| 10. | The enzyme taking part in joining two ends of DNA is (a) Ligase (b) Polymerase (c) Gyrase (d) Helicase | Answer: (a) |
------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
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