DNA Structure and Replication problems
- 1. DNA gyrase in E. coli
Options- A. adds positive supercoils to chromosomal DNA
- B. can be inhibited with antibiotics
- C. is required only at the oriC site
- D. performs the same function as helicase in eukaryotes Discuss
Correct Answer: can be inhibited with antibiotics
- 2. Enzyme, responsible for proofreading base pairing is
Options- A. DNA polymerase
- B. Telomerase
- C. Primase
- D. DNA ligase Discuss
Correct Answer: DNA polymerase
- 3. Klenow fragment without free nucleotides exhibits
Options- A. exonuclease activity
- B. endonuclease activity
- C. nickase activity
- D. no activity Discuss
Correct Answer: exonuclease activity
- 4. In DNA, guanine pairs with
Options- A. Adenine
- B. Cytosine
- C. Thymine
- D. Uracil Discuss
Correct Answer: Cytosine
- 5. The accepted hypothesis for DNA replication is
Options- A. conservative theory
- B. dispersive theory
- C. semi-conservative theory
- D. evolutionary theory Discuss
Correct Answer: semi-conservative theory
- 6. What is the approximate size (in kb) of the E. coli genome?
Options- A. 3000 kilobase
- B. 4500 kilobase
- C. 5500 kilobase
- D. 6500 kilobase Discuss
Correct Answer: 4500 kilobase
- 7. Which of the following would not contain DNA?
Options- A. Yeast
- B. Bacteria
- C. Glass crystals
- D. Mold Discuss
Correct Answer: Glass crystals
- 8. In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called
Options- A. protamines
- B. purines
- C. pyrimidines
- D. all of the above Discuss
Correct Answer: protamines
- 9. 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
Correct Answer: Formation of thymine dimers
- 10. Which is the largest among the followings?
Options- A. Nucleotide
- B. Nitrogenous base
- C. Phosphate
- D. Carbon Discuss
Correct Answer: Nucleotide
More in Biochemistry:
Programming
Copyright ©CuriousTab. All rights reserved.