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- Question
In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2?
A ---(E1)---> B ---(E2)---> C ---(E3)--->
Options- A. A, B, C, and D will all still be produced
- B. A, B, and C will still be produced, but not D
- C. A and B will still be produced, but not C or D
- D. A will still be produced, but not B, C, or D
- Correct Answer
- A and B will still be produced, but not C or D
- 1. DiGeorge's syndrome is characterized by the lack of a thymus The mouse model closest to this human disease would be a
Options- A. knock-out mouse for RAG-1 and RAG-2
- B. knock-out mouse for a thymus
- C. nude mouse
- D. recombinant mouse for CD3 Discuss
- 2. Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?
Options- A. Isoleucine, valine and phenylalanine
- B. Phenylalanine, valine, and aspartate
- C. Leucine, threonine, and lysine
- D. Lysine, arginine and histidine Discuss
- 3. Chronic granulomatous disease results from a failure to perform oxidative burst. This deficiency would be most likely to interfere with
Options- A. CTL killing of viruses
- B. dendritic cell activation to become a mature APC
- C. infected cell processing of virus peptides
- D. macrophage intracellular killing of bacteria Discuss
- 4. What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located?
Options- A. Insulin; many different cell types that use glucose for fuel
- B. Insulin; beta cells of the pancreas
- C. PDGF; the blood
- D. NGF; the nerves involved in simple reflexes Discuss
- 5. 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
- 6. A human cDNA library
Options- A. contains DNA for specific human proteins
- B. contains DNA for virtually all of the human proteins in vectors
- C. cannot be used to obtain human genes because it would be radioactive
- D. none of the above Discuss
- 7. Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?
Options- A. Because other body tissues use a different signaling molecule
- B. Because nitric oxide cannot cross cell membranes and enter the blood
- C. Because nitric oxide breaks down quickly and thus cannot travel far
- D. None of the above Discuss
- 8. Which of the following is not the hydrophobic and aromatic amino acid?
Options- A. Phenylalanine
- B. Tyrosine
- C. Tryptophan
- D. None of these Discuss
- 9. Cholesterolemia means
Options- A. lack of functional LDL receptors
- B. lack of functional HDL receptor
- C. high sensitivity to fatty food intake
- D. none of the above Discuss
- 10. The E.coli pyruvic acid dehydrogenase complex is reported to
Options- A. decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2
- B. Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
- C. retard the reduction of pyruvic acid to acetyl Co A and CO2
- D. Catalyze the reduction of pyruvic acid to acetyl Co A and CO2 Discuss
More questions
Correct Answer: nude mouse
Correct Answer: Isoleucine, valine and phenylalanine
Correct Answer: macrophage intracellular killing of bacteria
Correct Answer: Insulin; many different cell types that use glucose for fuel
Correct Answer: hydrogen bonds between the pair of bases
Correct Answer: contains DNA for virtually all of the human proteins in vectors
Correct Answer: Because nitric oxide breaks down quickly and thus cannot travel far
Correct Answer: None of these
Correct Answer: lack of functional LDL receptors
Correct Answer: Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
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