Which one of the following biomolecules is correctly characterised?

• Lecithin – A phosphorylated glyceride found in cell membrane

• Palmitic acid – An unsaturated fatty acid with 18 carbon atoms

• Adenylic acid – adenosine with a glucose phosphate molecule

• Adenylic acid – adenosine with a glucose phosphate molecule

For its activity, carboxypeptidase requires

• Zinc

• Iron

• Niacin

• Niacin

Which one is the most abundant protein in the animal world?

• Trypsin

• Haemoglobin

• Collagen

• Collagen

Which one out of A – D given below correctly represents the structural formula of the basic amino acid?

• C

• D

• A

• A

The enzyme recombinase is required at which stage of meiosis

• Pachytene

• Zygotene

• Diplotene

• Diplotene

Which one of the following statements in incorrect?

• A competitive inhibitor reacts reversibly with the enzyme to form an enzymeinhibitor complex

• In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

• The competitive inhibitor does not affect the rate of breakdown of the enzymesubstrate complex.

• The competitive inhibitor does not affect the rate of breakdown of the enzymesubstrate complex.

The 3' 5'  phosphodiester linkages inside a polynucleotide chain serve to join

• one DNA strand with the other DNA strand

• one nucleoside with another nucleoside

• one nucleotide with another nucleotide

• one nucleotide with another nucleotide

The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration)

What do the two axises (X and Y) represent?

• X –axis	Y-axis
  Temperature	Enzyme activity

• X –axis	Y-axis
  Substrate concentration	enzymatic activity

• X –axis	Y-axis
  enzymatic activity	temperature

• X –axis	Y-axis
  enzymatic activity	temperature

Three of the following statements about enzymes are correct and one is wrong. which one is wrong?

• Enymes require optimum pH for maximal activity

• Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80^o-90^o C

• Enzymes are highly specific

• Enzymes are highly specific

Which of the following enzymes carries out initial step in the digestion of milk in humans?

• Rennin

• Lipase

• Trypsin

• Trypsin