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- Question
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
- Correct Answer
- All of the above
- 1. Enhancers differ from promoters in that
Options- A. they initiate transcription
- B. they are adjacent to the start codon
- C. their orientation can be inverted without effect
- D. they are restricted to a specific gene Discuss
- 2. Different DNA polymerases play distinct roles in DNA replication and repair in both prokaryotic and eukaryotic cells. All known DNA polymerases synthesize DNA only in the __________ by the addition of dNTPs to a performed primer strand of DNA.
Options- A. positive direction
- B. 3' to 5' direction
- C. 5' to 3' direction
- D. negative direction Discuss
- 3. Klenow fragment without free nucleotides exhibits
Options- A. exonuclease activity
- B. endonuclease activity
- C. nickase activity
- D. no activity Discuss
- 4. The Hill coefficient (nH) for myoglobin and hemoglobin are respectively
Options- A. 2.8 and 1.0
- B. 1.0 and 2.8
- C. 1.2 and 4.5
- D. 4.5 and 1.2 Discuss
- 5. Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it
Options- A. changes the shape and thus the enzymatic activity of the proteins involved
- B. makes the receptor more likely to capture the signaling, molecule
- C. allows hydrophilic signaling molecules to cross the plasma membrane
- D. None of the above Discuss
- 6. Which of the following ion is required for the development of sound teeth with resistance to tooth decay?
Options- A. Fluoride ion
- B. Sodium ion
- C. Chloride ion
- D. Magnesium ion Discuss
- 7. The first intermediate in TCA cycle is
Options- A. succinate
- B. fumerate
- C. citrate
- D. malate Discuss
- 8. Which of the following is not a significant biological oxidizing agent?
Options- A. FAD
- B. Fe3+
- C. O2
- D. NAD+ Discuss
- 9. What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?
Options- A. B
- B. H
- C. S
- D. None of these Discuss
- 10. The production or break down of __________ is often coupled with the metabolic reactions of biosynthesis and catabolism.
Options- A. aspirin
- B. DNA
- C. ATP
- D. CO2 Discuss
More questions
Correct Answer: their orientation can be inverted without effect
Correct Answer: 5' to 3' direction
Correct Answer: exonuclease activity
Correct Answer: 1.0 and 2.8
Correct Answer: changes the shape and thus the enzymatic activity of the proteins involved
Correct Answer: Fluoride ion
Correct Answer: citrate
Correct Answer: Fe3+
Correct Answer: H
Correct Answer: ATP
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