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- Question
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
- Correct Answer
- Increases
- 1. Enzymes, responsible for unraveling short segments of DNA is
Options- A. DNA polymerase
- B. helicase
- C. DNA ligase
- D. primase Discuss
- 2. Messelsen and Stahl model of replication was called
Options- A. conservative replication
- B. semi-conservative replication
- C. dispersive replication
- D. Cri du Chat Discuss
- 3. Two key organizing principles for large multicellular organisms are
Options- A. prokaryotic cell structure and cell specialization
- B. cell specialization and communication between cells
- C. communication between cells and simple nerve reflexes
- D. simple nerve reflexes and cell specialization Discuss
- 4. In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common?
Options- A. They destroy the receptors for key signaling molecules
- B. They prevent the production of key signaling molecules
- C. They alter the chemical structure of key signaling molecules
- D. They block the normal functioning of signal transduction mechanisms Discuss
- 5. In vasodilation, proper nerve signals sent to blood vessels cause
Options- A. the release of nitric oxide from endothelial cells
- B. relaxation of smooth muscle cells
- C. reduced blood pressure
- D. All of the above Discuss
- 6. The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?
Options- A. DNA has one main function in cells whereas proteins have many.
- B. The many different amino acid R groups on proteins confer many different shapes.
- C. Some S amino acids cause proteins to bend; others cause protein to flatten.
- D. All of the above Discuss
- 7. The 5' and 3' numbers are related to the
Options- A. length of the DNA strand
- B. carbon number in sugar
- C. the number of phosphates
- D. the base pair rule Discuss
- 8. Which of the following enzyme adds complementary bases during replication?
Options- A. Helicase
- B. Synthesase
- C. Replicase
- D. Polymerase Discuss
- 9. In DNA double helix, the two DNA chains are held together by
Options- A. covalent bonds between the pair of bases
- B. hydrogen bonds between the pair of bases
- C. ionic bonds between the pair of bases
- D. none of the above Discuss
- 10. The chromosomal DNA complexes with
Options- A. three types of histone as H1, H2A and H4
- B. five types of histone as H1, H2A, H2B, H3 and H4
- C. four types of histone as H1, H2A, H3 and H4
- D. two types of histone as H1 and H4 Discuss
DNA Structure and Replication problems
Search Results
Correct Answer: helicase
Correct Answer: semi-conservative replication
Correct Answer: cell specialization and communication between cells
Correct Answer: They block the normal functioning of signal transduction mechanisms
Correct Answer: All of the above
Correct Answer: All of the above
Correct Answer: carbon number in sugar
Correct Answer: Polymerase
Correct Answer: hydrogen bonds between the pair of bases
Correct Answer: five types of histone as H1, H2A, H2B, H3 and H4
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