Given below is the diagrammatic representation of one of the categories of small

molecular weight organic compounds in the living tissues. Identify the category shown

and the one blank component X in it

Category              Component

1. Cholesterol       Guanin

2. Amino acid       NH₂

3. Nucleotide        Adenine

4. Nucleoside       Uracil

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched

with the category mentioned against it?

1. Thymine, Uracil         - Pyrimidines

2. Uracil, Cytosine         - Pyrimidines

3. Guanine, Adenine      - Purines

4. Adenine, Thymine     - Purines

An organic substance bound to an enzyme and essential for its activity is called:

1. coenzyme                   

2. holoenzyme

3. apoenzyme                 

4. isoenzyme

The inhibition of succinic dehydrogenase by malonate is an example of

1. competitive inhibition

2. non-competitive inhibition

3. allosteric modulation

4. none of the above

In a 50 gm living tissue, what would be the amount of water?

(1) 15-25 gm

(2) 25-30 gm

(3) 35-45 gm

(4) 70-90 gm

Which of the following elements is present in very less quantity in the body?

(1) K             

(2) Ca

(3) Mg           

(4) Cu

In a normal adult, ascending order of concentration of following molecules is

(1) Si>Mg>Na>C             

(2) Na>K>Cu>Fe

(3) Fe>Na>K>Cu             

(4) Na>Fe>K>Cu

The quaternary structure of a protein:

Adult human haemoglobin consists of:

1. 2 subunits (β, β)                           

2. 2 subunits (α, α)

3. 4 subunits (2α, 2β)                      

4. 3 subunits (2α, 1β)

Which one is false?
(1) Fatty acids may be unsaturated (with one or more C = C bonds) or a saturated (without double bonds)

(2) Fatty acid(s) may be esterified with glycerol forming monoglyceride, diglyceride and then triglyceride

(3) Some tissues especially neural tissues have lipids with very simple structures

(4) Fats and oils are triglycerides