Discussion
Home ‣ Biochemistry ‣ DNA Structure and Replication Comments
- Question
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
- Correct Answer
- One light and one medium band
- 1. 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 Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Retroviruses replicate via __________ intermediate
Options- A. RNA
- B. DNA
- C. mRNA
- D. rDNA Discuss
- 7. Which of following RNA characteristically contains unusual purines and pyrimidmes?
Options- A. rRNA
- B. nRNA
- C. mRNA
- D. tRNA Discuss
- 8. 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
- 9. The anticodon is a structure on
Options- A. mRNA.
- B. tRNA.
- C. aribosome.
- D. rRNA. Discuss
- 10. What modified base is at the 5' extremity of a capped eukaryotic m-RNA?
Options- A. 1-methyl-adenosine
- B. 2'-O-methyl-guanosine
- C. 7-methyl-guanosine
- D. 1-methyl-guanosine Discuss
DNA Structure and Replication problems
Search Results
Correct Answer: both chromatids of a chromosome were labeled
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: DNA
Correct Answer: tRNA
Correct Answer: It is a direct copy of a gene
Correct Answer: tRNA.
Correct Answer: 7-methyl-guanosine
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