Discussion
Home ‣ Biochemistry ‣ Enzymes See What Others Are Saying!
- Question
Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of
Options- A. a protein designated A
- B. two proteins designated A and B
- C. a protein A and one-subunit a
- D. a protein designated B
- Correct Answer
- two proteins designated A and B
- 1. Nucleoside is a pyrimidine or purine base
Options- A. covalently bonded to a sugar
- B. ionically bonded to a sugar
- C. hydrogen bonded to a sugar
- D. none of the above Discuss
- 2. Specialized transduction occurs when
Options- A. the bacteriophage incorporates randomly in the bacterial chromosome
- B. the bacteriophage never incorporates into the bacterial chromosome
- C. the bacteriophage always incorporates at the same position in the bacterial chromosome
- D. none of the above Discuss
- 3. Polyprotic acids such as H3PO4, can act as acid-base buffers
Options- A. only in combination with polyprotic bases
- B. if their concentration is kept low
- C. at pH values around neutrality
- D. at pH values around any of their pKa's Discuss
- 4. Stereo chemical configuration of all a-amino acids derived from proteins is
Options- A. L
- B. D
- C. L and D
- D. None of these Discuss
- 5. Bacterial protein called catabolic activator protein (CAP) is an example of
Options- A. negative control of gene expression
- B. positive control of gene expression
- C. second type of positive control of gene expression
- D. none of the above Discuss
- 6. A mutation in the tip binding site of the repressor would result in
Options- A. constitutive trp operon expression
- B. inducible trp operon expression
- C. no operon expression
- D. none of the above Discuss
- 7. PCR is an abbreviation for
Options- A. Protein Change Reaction
- B. Polymerase Chain Reaction
- C. Positive Charge Reaction:
- D. Preliminary Change Rate Discuss
- 8. According to the fluid mosaic model of cell membranes,
Options- A. the most common type of molecules in the membrane are proteins
- B. basic membrane structure results from how the proteins interact with water
- C. the membrane is a highly mobile mixture of phospholipids and proteins
- D. the unique properties of cell types are determined by their phospholipids Discuss
- 9. Which of the following is correct?
Options- A. Membranes form boundaries around the cell and distinct subcellular components
- B. Membranes act as selectively permeable barrier
- C. Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates
- D. All of the above Discuss
- 10. Cholesterol is essential for normal membrane functions because it
Options- A. plugs up the cardiac arteries of older men
- B. cannot be made by higher organisms
- C. keeps membranes fluid.
- D. spans the thickness of the bilayer Discuss
More questions
Correct Answer: covalently bonded to a sugar
Correct Answer: the bacteriophage always incorporates at the same position in the bacterial chromosome
Correct Answer: at pH values around any of their pKa's
Correct Answer: L
Correct Answer: second type of positive control of gene expression
Correct Answer: constitutive trp operon expression
Correct Answer: Polymerase Chain Reaction
Correct Answer: the membrane is a highly mobile mixture of phospholipids and proteins
Correct Answer: All of the above
Correct Answer: keeps membranes fluid.
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