A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Reverse transcripase from HIV does not
A. uses RNA as a template
B. has a 5' to 3' polymerase activity
C. has a 3'- 5' exonuclease activity
D. requires a primer
2. Which of the following liver enzymes is predominantly mitochondrial?
A. SGOT (AST)
B. SGPT (ALT)
C. GGT
D. 5' Nucleotidase
3. All of the following are derived from tyrosine, EXCEPT
A. Norepinephrine
B. Melatonin
C. Thyroxine
D. Dopamine
4. The pH of a solution is determined by
A. concentration of salt
B. relative concentration of acids and bases
C. dielectric constant of the medium
D. environmental effect
5. Antibodies can be used
A. for the localization of proteins in the cell
B. for protein purification
C. to catalyze chemical reactions
D. all of the above
6. NADP+ is reduced to NADPH during
A. light dependent reactions
B. photorespiration
C. calvin cylcle
D. none of these
7. A glucogenic amino acid is one which is degraded to
A. keto-sugars
B. either acetyl CoA or acetoacetyl CoA
C. pyruvate or citric acid cycle intermediates
D. none of the above
8. Prenatal Diagnosis of hemophilia is best done by:
A. PCR
B. Linkage analysis
C. Cytometry
D. Microarray
9. Why do fluorescence spectrometers often use double-beam optics?
A. So a reference solution can be used
B. To compensate for beam attenuation by the monochromator
C. To compensate for power fluctuations in the radiation source
D. All of the above
10. Membrane potential and the proton gradient
A. are both required to make ATP
B. are sufficient, separately, to make ATP from ADP + Pi;
C. reinforce one another when respiratory inhibitors are present
D. cancel one another when uncouplers are present
11. Which of the following is not a necessary component of translation?
A. Anticodon
B. mRNA
C. Ligase
D. Amino acid
12. Thin layer chromatography is
A. partition chromatography
B. electrical mobility of ionic species
C. adsorption chromatography
D. none of the above
13. All of the following are required for lysyl hydroxylase reaction, EXCEPT
A. Alpha keto glutarate
B. Copper
C. Iron
D. Vitamin C
14. Arachidonate has 20 carbon atoms with
A. 3 double bonds
B. 2 double bonds
C. 4 double bonds
D. 8 double bonds
15. The chromosomal DNA complexes with
A. three types of histone as H1, H2A and H4
B. five types of histone as H1, H2A, H2B, H3 and H4
C. four types of histone as H1, H2A, H3 and H4
D. two types of histone as H1 and H4
16. Which of the following compounds is responsible for coordinated regulation of glucose and glycogen metabolism?
A. NAD+
B. Fructose 2,6 bisphosphate
C. Acetyl-CoA
D. Fructose 1,6 bisphosphate
17. Mousy odor of urine in phenylketonuria is due to
A. Phenyl alanine
B. Phenyl pyruvate
C. Phenyl acetate
D. Phenyl lactate
18. Which of the following relationships between absorbance and %transmittance is incorrect?
A. A = log10 100 / %T
B. A = 2 - log10 %T
C. A = log10 1 / T
D. All are correct
19. The key enzyme in the regulation of fatty acid synthesis is
A. acetyl CoA carboxylase
B. AMP activated proteinkinase
C. protein phosphatase
D. none of these
20. What is the minimum number of ubiquitin molecules that must be added to a protein for its degradation in a proteasome?
A. 1
B. 3
C. 4
D. 6
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