Test 91    (biochemistry)
1. Purines:
a. include guanine

b. are metabolized to uric acid

c. are mainly synthesized in the liver

d. are used in the formation of ATPs

e. are made from amino acids

2. Vitamin B12:

a. is a fat soluble protein

b. is essential for the metabolism of folic acid in 
    the humans

c. is attached to a glycoprotein in the circulation

d. its deficiency is characterized by hypersegmentation
    of the neutrophils

e. its deficiency causes blindness

3. Ascorbic acids:

a. are present in high concentration in the adrenal cortex
    and the eye.

b. stress reduces the body concentration of ascorbic acids

c. excessive amount leads to the formation of oxalate 
    stones in the urinary tracts

d. are heat-labile

e. are present in higher concentration in the aqueous than
    in the circulation.

4. Folic acid:

a. is water soluble

b. is absorbed in the stomach

c. deficiency leads to aplastic anaemia

d. deficiency occurs with methatrexate treatment

e. deficiency is associated with risk of neural tube defect
    in the newborn.

5. Prostaglandins:

a. contains 20 carbon atoms

b. are unsaturated fatty acids containing a cyclopentane 

c. are metabolized in the lungs

d. the different types of prostaglandins are classified
    according to the configuration of the cyclopentane ring

e. have a biological half-life of about 24 hours.

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