DNA Structure and Replication problems
- 1. Telomeres are usually rich in which nucleotide?
Options- A. Adenine
- B. Guanine
- C. Thymine
- D. Cytosine Discuss
Correct Answer: Guanine
- 2. DNA helicase is used to
Options- A. unwind the double helix
- B. interact the double helix closely
- C. break a phosphodiester bond in DNA strand
- D. none of the above Discuss
Correct Answer: unwind the double helix
- 3. DNAs when charged, migrate in a gel towards the
Options- A. positive pole
- B. negative pole
- C. will not migrate
- D. none of these Discuss
Correct Answer: positive pole
- 4. The most common liquid volumes in molecular biology are measured in
Options- A. ml
- B. ?l
- C. nl
- D. 1 Discuss
Correct Answer: ?l
- 5. In DNA, there are
Options- A. five bases known as adenine, guanine, thymine, tryptophan and cytosine
- B. four bases known as adenine, guanine, thymine and cytosine
- C. three bases known as adenine, guanine and cytosine
- D. only two bases known as adenine and cytosine Discuss
Correct Answer: four bases known as adenine, guanine, thymine and cytosine
- 6. If one cell has AT contents 40%, what will be the percentage of Guanine residue?
Options- A. 60%
- B. 15%
- C. 30%
- D. Guanine residue can not be calculated Discuss
Correct Answer: 30%
- 7. The overall conclusion of the Hershey-Chase experiment was that
Options- A. DNA was responsible for heredity
- B. proteins and DNA were responsible for heredity
- C. the ratio of Adenine to thymine was always the same
- D. phage DNA was similar to bacterial DNA Discuss
Correct Answer: DNA was responsible for heredity
- 8. A cesium chloride will separate DNA molecules by
Options- A. absorption
- B. resorption
- C. density
- D. adhesion Discuss
Correct Answer: density
- 9. Which of the following is incorrect?
Options- A. In DNA double helix, two strands of the DNA are bound with each other with the bases
- B. Adenine always pairs with thymine
- C. Guanine always pairs with the cytosine
- D. None of the above Discuss
Correct Answer: None of the above
- 10. Which DNA polymerase removes RNA primers in DNA synthesis?
Options- A. Polymerase I
- B. Polymerase II
- C. Polymerase III
- D. none of these Discuss
Correct Answer: Polymerase I
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