Which one out of A – D given below correctly represents the structural formula of the basic amino acid?
C
D
A
A
Which one is the most abundant protein in the animal world?
Trypsin
Haemoglobin
Collagen
Collagen
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 80o-90o 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
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 |
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
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
The enzyme recombinase is required at which stage of meiosis
Pachytene
Zygotene
Diplotene
Diplotene
