Multiple Choice Questions (MCQs)
- The model of DNA replication in which one strand is
conserved and other is synthesized is:
(a) Conservative (b) Semi-const rvative(c) Dispersive (d) None
- In semi-conservativt model the strands separated and acts as:
(a) Enzyme (d) Tool (c) Model (d) Finger prints
- The semi consm vative model of DNA was proved by:
(a) P.A. Levene (b) Meselson – Stahl
(c) F. Miescher (d) Watson and Crick
- The enzyme which attaches the fragments of DNA is:
(a) DNA polymerase I (b) Primase
(c) Ligase (d) DNA polymerase II
- The true replicating enzyme is:
(a) DNA polymerase III (b) Ligase
(c) Primase (d) DNA polymerase 11
- The enzyme which play a supporting role in DNA replication is:
(a) DNA polymerase I (b) Pirmase
(c) Ligase (d) DNA polymerase II
- The DNA polymerase only add nucleotide to the end:
(a) 2 (b) 3 (c) 4 (d) 5
- The strands in which elongates towards replication fork is: (a) Leading strand(b) Lagging strand(c) (a) and (b) (d) None
- The length of Okazaki fragments is:
(a) 100 -200 nucleotide (b) 200-300 nucleotide
(c) 300-400 nucleotide (d) 400-500 nucleotide
- Okazaki fragment is a:
(a) RNA (b) DNA (c) Protein (d) Enzyme
- Okazaki fragments are synthesize by:
(a) DNA polymerase 1 (b) Pirmase
(c) Ligase (d) DNA polymerase III
- The synthesis of protein is called: (a) Replication (b) Transcription(c) Translation (d) None
- The synthesis of RNA from DNA is: (a) Transcription(b) Replication (c) Translation (d) None
- Anticodons are present on:
(a) mRNA (b) rRNA (c) tRNA (d) non
- Codes are present on:
(a) mRNA (b) rRNA (c) tRNA (d) non
- The strand which is transcribed during transcription is:
(a) Leading strand (b) Antisense strand
(c) Sense strand (d) Lagging strand
- mFtNA is synthesized by:
(a) RNA Polymerase I (b) RNA Polymerase II
(c) RNA Polymerase III (d) None of the above
- Transcription starts at:
(a) Operator (b) Promoter (c) Enhancer (d) none
Answers:
| 1. (b) | 2. (c) | 3. (b) | 4. (c) | 5. (a) | 6. (d) | 7. (b) | 8. (a) |
| 9. (a) | 10. (b) | 11. (d) | 12. (c) | 13. (b) | 14. (c) | 15. (a) | 16. (b) |
| 17. (b) | 18. (b) |
Fill in blanks
- The Watson – Crick Model suggests, that is the basis of copying the genetic information.
- In semi conservative replication the strands of the duplex
separate. Each strand acts a_____________
- The complex process of DNA replication is catalyzed by DNA
____________ and other enzymes.
4-The enzyme___________ synthesiz.: an RNA primer.
5-Series of short segments of DNA are synthesized. These segments are connected later on. These segments are called__________.
6-The synthesis of inRNA from the DNA is called ___________
7-The RNA polymerase enzymes synthesize RNA from
__________ direction.
8-RNA polymerase has one subunits called_____________
9-The DNA strands open up at the place where enzyme.is attached
with the template strand. It forms_________________
10-The initiation codon is__________
11-Three codons UAA. UAG and UGA do not code for any amino
acid. So they are known as__________
12-The synthesis of protein from mRNA is called _______________
13-The tRNA molecules possess complementary three nucleotide
sequence. It is called__________
I. Complimentary 2. model 3. polymerase 4. primase
5. Okazaki 6. transcription7. 5 to 3 8. sigma
9. fork 10. AUG 11. termination12. translation
13. anticode 14. Initiation 15. releasing factor
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