Discussion
Home ‣ Biochemistry ‣ Lipid See What Others Are Saying!
- Question
How many classes of steroid hormones are there?
Options- A. 3
- B. 2
- C. 4
- D. 5
- Correct Answer
- 5
- 1. The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is
Options- A. phosphokinase C
- B. phospholipase C
- C. phosphodiesterase C
- D. lipokinase Discuss
- 2. Why is the TCA cycle the central pathway of metabolism of the cell?
Options- A. It occurs in the center of the cell
- B. Its intermediates are commonly used by other metabolic reactions
- C. All other metabolic pathways depend upon it
- D. None of the above Discuss
- 3. When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because
Options- A. their enzymes lose the proper three-dimensional shape
- B. enzyme active sites become permanently bound to substrates
- C. the activation energy for the reaction is raised
- D. there is insufficient molecular motion for substrates to interact Discuss
- 4. During the light-dependent reactions of photosynthesis, which of the following does not occur?
Options- A. Splitting of water
- B. Carbon dioxide fixation
- C. Release of oxygen
- D. Absorption of light energy by photosystems Discuss
- 5. In ion-exchange chromatography
Options- A. proteins are separated on the basis of their net charge
- B. proteins are separated on the basis of their size
- C. proteins are separated on the basis of their shape
- D. either (b) or (c) Discuss
- 6. An allosteric activator
Options- A. increases the binding affinity
- B. decreases the binding affinity
- C. stabilizes the R state of the protein
- D. both (a) and (c) Discuss
- 7. Which one of the following is a product of both cyclic and noncyclic photophosphorylation?
Options- A. NADPH
- B. O2
- C. ATP
- D. Carbohydrate Discuss
- 8. Which of those immunoglobulin classes is mainly found in external secretions?
Options- A. Ig A
- B. Ig D
- C. Ig M
- D. IgE Discuss
- 9. 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
- 10. Bacteriophages are
Options- A. cells in the blood that eat bacteria
- B. a class of bacteria
- C. bacterial viruses
- D. none of the above Discuss
More questions
Correct Answer: phospholipase C
Correct Answer: Its intermediates are commonly used by other metabolic reactions
Correct Answer: there is insufficient molecular motion for substrates to interact
Correct Answer: Carbon dioxide fixation
Correct Answer: proteins are separated on the basis of their net charge
Correct Answer: both (a) and (c)
Correct Answer: ATP
Correct Answer: Ig A
Correct Answer: can be inhibited with antibiotics
Correct Answer: bacterial viruses
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