Biology : Biomolecules

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

For its activity, carboxypeptidase requires

• Zinc

• Iron

• Niacin

• Niacin

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

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.

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

• Rennin

• Lipase

• Trypsin

• Trypsin

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

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 figure given below shows the conversion of a substrate to product by an enzyme. In which one of the four option (a-d), the components of reaction labelled as A, B, C and D are identified correctly?

• A	B	C	D
  Potential energy	Transition state	Activation energy with enzyme	Activation energy without enzyme

• A	B	C	D
  Transition energy	Potential energy	Activation energy with enzyme	Activation energy with out enzyme

• A	B	C	D
  Potential energy	Transition energy	Activation energy with out enzyme	Activation energy with enzyme

• A	B	C	D
  Potential energy	Transition energy	Activation energy with out enzyme	Activation energy with enzyme