Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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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. Which of the following detectors give concentration-dependent signals?
A. Electron-capture detector 
B. Thermal conductivity 
C. Infra-red detector 
D. All of these 

2. NADP+ is reduced to NADPH during
A. Light dependent reactions 
B. Photorespiration 
C. Calvin cylcle 
D. None of these 

3. Carbon skeleton of all of the following amino acids enter the TCA cycle at the level of ?-keto glutarate, EXCEPT
A. Proline 
B. Methionine 
C. Arginine 
D. Histidine 

4. Molar absorbtivity is the measure of the
A. Amount of light absorbed per unit length 
B. Amount of light absorbed per unit concentration 
C. Amount of light reflected and absorbed per unit concentration 
D. None of the above 

5. The pH of a solution is determined by
A. Concentration of salt 
B. Dielectric constant of the medium 
C. Relative concentration of acids and bases 
D. Environmental effect 

6. Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?
A. Hardy-Windberg law 
B. Haldanes equation 
C. Henderson-Hasselbalch equation 
D. Michaelis-Menten equation 

7. 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 

8. In SDS-PAGE, the protein sample is first
A. Treated with a reducing agent and then with anionic detergent followed by fractionation by electrophoresis 
B. Fractionated by electrophoresis then treated with an oxidizing agent followed by anionic detergent. 
C. Treated with a oxidizing agent and then with anionic detergent followed by fractionation by electrophoresis 
D. None of the above 

9. Why do fluorescence spectrometers often use double-beam optics?
A. All of the above 
B. So a reference solution can be used 
C. To compensate for beam attenuation by the monochromator 
D. To compensate for power fluctuations in the radiation source 

10. A polysome could be best described as
A. An active site of DNA synthesis. 
B. An active site of protein synthesis. 
C. All of the above. 
D. An active site of lipid synthesis. 

11. Antigen, when injected in the body activates its specific lymphocytes in the
A. MALT (mucosa associated 
B. Spleen lymphoid tissue 
C. Draining lymph nodes 
D. Blood circulation 

12. The competitive immunoassay can be used
A. Commonly to detect trace amounts of drugs. 
B. Both (a) and (b) 
C. To detect antibody associated with allergies (IgE) 
D. To detect very small amounts of antigen 

13. When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?
A. Phosphate 
B. Cytosine 
C. Uracil 
D. Guanine 

14. Hydrogen bonds in a-helices are
A. Analogous to the steps in a spiral staircase 
B. Not present at Phe residues 
C. Roughly parallel to the helix axis 
D. More numerous than Vander Waals interactions 

15. On the ribosome, mRNA binds
A. Between the subunits 
B. To the large subunit 
C. To the small subunit 
D. None of these 

16. Triacylglycerols are
A. Insoluble in water 
B. Soluble in water at elevated temperature 
C. Soluble in water 
D. Partially soluble in water 

17. Reactions that have positive standard free energy changes (?Go> 0) can be made to occur in cells by
A. Manipulating the concentrations of products and reactants such that G/<0 
B. All of the above 
C. Coupling them with exergonic reactions via a common intermediate 
D. Coupling them to the hydrolysis of ATP 

18. Which of the following is the storage form of proteins in human body?
A. Collagen 
B. Titin 
C. Both 
D. None 

19. When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes
A. A cation 
B. Nonpolar 
C. A zwitterions 
D. An isotope 

20. A molecule that can be covalently linked to a non-immunogenic antigen to make it an immunogen is called a (n)
A. Adjuvant 
B. Carrier 
C. Hapten 
D. Mitogen 

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