| 1. | DNA sequence is TAG. What shall be the sequence in anticodon of tRNA (a) UAG (b) ATC (c) ATG (d) UAC | Answer: (a) |
| 2. | DNA sequence of ATTCGATG is transcribed as (a) AUUCGAUG (b) UAAGCUAC (c) CAUCGAAU (d) GUAGCUUA | Answer: (b) |
| 3. | DNA strand with nitrogen base sequence ATTGCC will have sequence in mRNA (a) UAACGC (b) ATCGCC (c) ATTGCA (d) AGGACC | Answer: (a) |
| 4. | Double chained DNA strand is made radioactive in both its chains. It is allowed to replicate twice in non-radioactive medium. The result would be (a) All strands have radioactivity (b) Half the strands have radioactivity (c) Three strands have radioactivity (d) Radioactivity is absent in all strands | Answer: (b) |
| 5. | Double helical structure of DNA was proposed by (a) Kornberg (b) Nirenberg (c) Watson and Crick (d) Wilkins and Franklin | Answer: (c) |
| 6. | Functional unit of gene that specifies synthesis of one polypeptide is (a) Codon (b) Cistron (c) Recon (d) Muton | Answer: (b) |
| 7. | Gene is segment of (a) RNA (b) DNA (c) RNA or DNA (d) Both DNA and RNA | Answer: (b) |
| 8. | Genetically engineered bacteria are being used in commercial production of (a) Melatonin (b) Testoteron (c) Human insuline (d) Thyroxine | Answer: (c) |
| 9. | Haploid plant cultures are got from (a) Leaves (b) Root tip (c) Pollen grain (d) Buds | Answer: (c) |
| 10. | Hydrogen bonds present between cytosine and guanosine are (a) 2 (b) 3 (c) 1 (d) 4 | Answer: (b) |
------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
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