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- Question
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that
Options- A. only one chromatid of a chromosome was labeled
- B. both chromatids of a chromosome were labeled
- C. both (a) and (b)
- D. neither chromatid was labeled
- Correct Answer
- both chromatids of a chromosome were labeled
- 1. What is the range of melting point temperatures (Tm) for most DNA molecules?
Options- A. 50 to 60°C
- B. 60 to 80°C
- C. 70 to 90°C
- D. 80 to l00°C Discuss
- 2. The nucleosome consists of histone
Options- A. octamer and 146 bp of DNA
- B. tetramer and 146 bp of DNA
- C. hexamer and 146 bp of DNA
- D. none of the above Discuss
- 3. E.coli DNA polymerases II and III lack
Options- A. 5' ? 3' exonuclease activity
- B. 5' ? 3' endonuclease activity
- C. partially 5' ? 3' exonuclease activity
- D. partially 5' ? 3' endonuclease activity Discuss
- 4. DNA replication takes place in which direction?
Options- A. 3' to 5'
- B. 5 'to 3'
- C. Randomly
- D. Vary from organism to organism Discuss
- 5. DNA can be sequenced by the
Options- A. chemical method
- B. chain termination procedure
- C. both (a) and (b)
- D. physical method Discuss
- 6. What bands will be observed in a cesium chloride gradient after two rounds of replication?
Options- A. One light, one medium and one heavy band
- B. One light and one medium band
- C. One medium band
- D. One medium and one heavy band Discuss
- 7. Retroviruses replicate via __________ intermediate
Options- A. RNA
- B. DNA
- C. mRNA
- D. rDNA Discuss
- 8. Which of following RNA characteristically contains unusual purines and pyrimidmes?
Options- A. rRNA
- B. nRNA
- C. mRNA
- D. tRNA Discuss
- 9. What is the function of messenger RNA?
Options- A. It carries amino acids
- B. It is a component of the ribosomes
- C. It is a direct copy of a gene
- D. It is the genetic material of some organisms Discuss
- 10. The anticodon is a structure on
Options- A. mRNA.
- B. tRNA.
- C. aribosome.
- D. rRNA. Discuss
DNA Structure and Replication problems
Search Results
Correct Answer: 80 to l00°C
Correct Answer: octamer and 146 bp of DNA
Correct Answer: 5' ? 3' exonuclease activity
Correct Answer: 5 'to 3'
Correct Answer: both (a) and (b)
Correct Answer: One light and one medium band
Correct Answer: DNA
Correct Answer: tRNA
Correct Answer: It is a direct copy of a gene
Correct Answer: tRNA.
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