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 immune cells would have an especially low count in a patient with advanced AIDS?
A. Killer T lymphocytes
B. Helper T lymphocyte
C. B lymphocytes
D. None of these
2. Rothera's test used for detection of
A. Proteins
B. Glucose
C. Fatty Acid
D. Ketones
3. Cleavage of an IgG molecule by a specific protease can produce
A. an antigen-binding site and two constant regions
B. two heavy chain-light chain dimers
C. an inactive mixture of oligopeptides
D. two Fab fragments and one Fc fragment
4. Food with maximum Cholesterol content
A. Egg
B. Coconut Oil
C. Hydrogenated Fats
D. Ghee (Hydrogenated)
5. Which of the following is most likely to produce anaphylaxis in a susceptible individual?
A. Pollen
B. Mold
C. Dust
D. Bee sting
6. Signal sequences are part of a protein that
A. signal folding of the protein
B. signal the protein synthesis on the ribosomes is ended
C. transport proteins to other sites within the cell
D. refold proteins in prion-associated diseases
7. 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
8. HPLC methods include
A. liquid/liquid (partition) chromatography
B. liquid/solid (adsorption) chromatography
C. ion exchange and size exclusion chromatography
D. all of the above
9. Proteins can be visualized directly in gels by
A. staining them with the dye
B. using electron microscope only
C. measuring their molecular weight
D. none of these
10. Which of these effects result from slow injection of a large sample volume?
A. Increased resolution
B. Decreased resolution
C. Non-linear detector response
D. Constant resolution
11. In Phenylketonuria, the first line therapy is:
A. Replacement of the defective enzyme
B. Replacement of the deficient product
C. Limiting the substrate for deficient enzyme
D. Giving the missing amino acid by diet
12. Cholesterol is somewhat amphipathic due to
A. the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
B. the long branched hydrocarbon along with the four hydrocarbon rings
C. the five-methyl groups along with the hydrocarbon chain
D. the three six-membered rings along with the single five-membered ring
13. 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
14. The binding of lac repressor to DNA could be considered to be analogous to
A. competitive inhibition of an enzyme
B. mixed-type inhibition of an enzyme
C. uncompetitive inhibition of an enzyme
D. allosteric effects in enzyme regulation
15. What is the end product of leucine metabolism?
A. Acetyl-CoA
B. Pyruvic acid
C. Oxaloacetic acid
D. Acetyl carnitine
16. Which of the following is not used for detection in GC?
A. Infrared spectroscopy
B. NMR
C. Flame ionisation
D. Electrical conductivity
17. If the enthalpy change for a reaction is zero, ?G° is equal to
A. T?S°
B. -T?S°
C. -?H°
D. lnKeq
18. Which one of the following is a product of both cyclic and noncyclic photophosphorylation?
A. NADPH
B. O2
C. ATP
D. Carbohydrate
19. Sex lethal (sxl) in Drosophila is transcribed when
A. the X autosome balance is less than 0.5
B. the X autosome balance is 1 or greater
C. the X autosome balance equals 0.5
D. none of the above
20. For gene transfer to be effective, transforming DNA must be
A. incorporated into the bacterial chromosome
B. incorporated into a viral genome
C. free in the bacterial cytoplasm
D. none of the above
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