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

The above diagram represent the nitrogenous bases. Identify the correct combination:

(1) A = Adenine; B = Thymine          

(2) A = Guanine; B = Thymine

(3) A = Adenine; B = Uracil               

(4) A = Guanine; B = Uracil

Which one of the following is the diagrammatic representation of a nucleotide?

(a)  (b)       (c)     (d)