Showing posts with label BIOCHEMISTRY. Show all posts
Showing posts with label BIOCHEMISTRY. Show all posts

522. For a normal healthy person, the daily requirement of vitamin C is:



A.   10 to 50 mg                              B. 50 to 100 mg
C.   100 to 200 mg                          D. 200 to 300 mg

485. Thiamine deficiency causes decreased energy production because

 a) It is required for the process of transamination.
 b) It is co-factor in oxidative reduction .
c)It is co-enzyme for transketolase in pentose phosphate pathway .
d) It is co-enzyme for pyruvate dehydrogenase.

Ans-d) It is co-enzyme for pyruvate dehydrogenase.

471.Denaturation of double stranded DNA results in

a.It gets broken down to nucleotides.
b.It becomes single stranded reversibly.
c.Becomes single stranded iireversibly.
d.Becomes double stranded permanently.

Ans-b.It becomes single stranded reversibly.


84.Which of the following amino acids would most likely be found on the surface of a protein molecule?

A. Alanine B. Arginine
C. Isoleucine
D. Leucine
E. Phenylalanine


The correct answer is B. This question requires two logical steps. First, you need to appreciate that hydrophilic amino acids are more likely to appear on the surface of a protein molecule, whereas hydrophobic amino acids are most likely be found in the interior. Next, you need to figure out which of the amino acids listed is hydrophilic. If you recall that arginine is a basic amino acid that is positively charged at physiologic pH, you should be able to answer this question right away.

All the other choices have neutral side chains and are uncharged at physiologic pH. They would most likely be found in the hydrophobic core of the protein structure. Alanine (choice A), isoleucine (choice C), and leucine (choice D) all have aliphatic side chains; phenylalanine (choice E) and tryptophan have aromatic side chains.


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71.The vitamin that can be synthesized by microorganisms only:

1. Cobalamine.2. Folic acid.

3. Niacin. 4. None.



ANS. 1

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56.Lysis of fibrin is brought about by:

A. Plasmin B. Hyaluronidase
C. Collagenase D. Coagulase


Answer is: A- Plasmin. (Ref. K.D. Tripathi-5th )



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