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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. In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?
Options- A. Remains same
- B. Increases
- C. Decreases
- D. Can not be compared Discuss
- 2. The primary reason for AIDS, a deadly disease is that it
Options- A. is caused by a virus
- B. is caused by a bacterium
- C. destroys key components of the body's internal defense system
- D. causes a breakdown of the body's inflammatory response Discuss
- 3. What is the main damaging effect of UV radiation on DNA?
Options- A. Depurination
- B. Formation of thymine dimers
- C. Single strand break
- D. Dehydration Discuss
- 4. Which of the following is required as a component of blood hemoglobin?
Options- A. Iron
- B. Magnesium
- C. Calcium
- D. Copper Discuss
- 5. Translation in prokaryotes begins by the formation of a 30S initiation complex between the
Options- A. 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
- B. 30S ribosomal subunit, tRNA and initiation factors
- C. 30S ribosomal subunit and mRNA only
- D. 30S ribosomal subunit, mRNA and initiation factors Discuss
- 6. What is the approximate percentage of repetitive DNA sequences in human DNA?
Options- A. 10 to 20%
- B. 20 to 30%
- C. 30 to 40%
- D. 40 to 50% Discuss
- 7. In eukaryotes fatty acid breakdown occurs in
Options- A. mitochondrial matrix
- B. cytosol
- C. cell membrane
- D. endoplasmic reticulum Discuss
- 8. A deficiency of niacin causes
Options- A. pellagra
- B. scurvy
- C. cataract
- D. anemia Discuss
- 9. An intermediate which inhibits the activity of fructose 1,6 diphos-phatase would inhibit
Options- A. glycolysis
- B. pyrolysis
- C. gluconeogenesis
- D. none of these Discuss
- 10. The lac operon is transcribed in which segments?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
More questions
Correct Answer: Increases
Correct Answer: destroys key components of the body's internal defense system
Correct Answer: Formation of thymine dimers
Correct Answer: Iron
Correct Answer: 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
Correct Answer: 20 to 30%
Correct Answer: mitochondrial matrix
Correct Answer: pellagra
Correct Answer: gluconeogenesis
Correct Answer: 1
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