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Home ‣ Biochemistry ‣ Disease Associated with Immune System See What Others Are Saying!
- Question
Bone marrow given to an infant with SCID must
Options- A. be irradiated to eliminate GVHD
- B. contain mature T cells that can begin making immune responses immediately
- C. come from a donor that shares some MHC alleles with the recipient
- D. come from one of the child's parents
- Correct Answer
- come from a donor that shares some MHC alleles with the recipient
- 1. The role of Asp 102 and His 57 during trypsin catalysis is to
Options- A. neutralize the charge on the other's side chain
- B. keep the specificity pocket open
- C. function as a proton shuttle
- D. clamp the substrate into the active site Discuss
- 2. Which of the following is a second messenger?
Options- A. lnositol 1,4,5-triphosphate
- B. Diacyl glycerol
- C. Phospholipase C
- D. Both (a) and (b) Discuss
- 3. Transcription by E. coli polymerase occurs in
Options- A. four phases known as initiation, propagation, elongation and termination
- B. three phases known as initiation, elongation and termination
- C. two phases known as initiation and termination
- D. none of the above Discuss
- 4. Upstream regions which are essential for correct transcription are called
Options- A. enhancers
- B. start codons
- C. promoters
- D. transcription factors Discuss
- 5. The products of urea cycle are
Options- A. 1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
- B. 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
- C. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
- D. None of the above Discuss
- 6. For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?
Options- A. Because a change in dipole moment lowers the energy required for electronic transitions
- B. Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment
- C. Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching
- D. All of the above Discuss
- 7. Because DNA is a highly charged polyanion, its stability to heat denaturation
Options- A. does not depend on hydrophobic interactions
- B. increases with increasing salt
- C. is independent of G - C content
- D. decreases with increasing salt Discuss
- 8. In order to insert a foreign gene into a plasmid, both must __________
Options- A. have identical DNA sequences
- B. originate from the same type of cell
- C. be cut by the same restriction enzyme
- D. be of the same length Discuss
- 9. Which of the following amino acids interact with the DNA or RNA backbone (i.e. phosphate)?
Options- A. Ile and Val
- B. Lys and Arg
- C. Leu and Ala
- D. Cys and Met Discuss
- 10. A nucleotide consists of
Options- A. a sugar, a base and a phosphate
- B. a sugar and a phosphate
- C. paired bases
- D. a sugar, a base and three phosphates Discuss
More questions
Correct Answer: function as a proton shuttle
Correct Answer: Both (a) and (b)
Correct Answer: three phases known as initiation, elongation and termination
Correct Answer: promoters
Correct Answer: 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
Correct Answer: Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment
Correct Answer: increases with increasing salt
Correct Answer: be cut by the same restriction enzyme
Correct Answer: Lys and Arg
Correct Answer: a sugar, a base and a phosphate
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