The steps in catalytic cycle of an enzyme action are given in random order
I. The enzyme releases the products. Now enzyme is free to bind another substrate
II. The active sites, now in close proximity of substrate break the bond of substrate and E – P complex forms
III. Binding of substrate induces the enzyme to alter its shape fitting more tightly around the substrate
IV. The substrate binds to the active site of enzyme (i.e., fitting into the active site.
The correct order is
1. I, II, III, IV
2. IV, III, II, I
3. I, III, II, IV
4. I, II, IV, III
Which one of the following biomolecules is correctly characterized?
1. Lecithin – a phosphorylated glyceride found in cell membrane
2. Palmitic acid – an unsaturated fatty acid with 18 carbon atoms
3. Adenylic acid – adenosine with a glucose and phosphate molecule
4. Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule
Which of the following is not a secondary metabolite?
1. Antibiotics
2. Vitamins
3. Carotenoids
4. Morphine
Which of the following elements is present in higher proportion [% weight of the total] in Earth's crust with respect to the average composition of a human body?
1. Carbon
2. Nitrogen
3. Sulfur
4. Magnesium
A glycosidic bond connects:
(1) two monosaccharides
(2) two amino acids
(3) two fatty acids
(4) a fatty acid and a glycerol
The Km value of an enzyme denotes the substrate concentration at which the enzyme catalyzed reaction:
1. Reaches Vmax
2. Shows decline in the rate of reaction
3. Attains ½ Vmax
4. Finally stops
The “primary structure” of a protein refers to:
1. coiling due to hydrogen bonding between amino acids
2. the alpha helix or pleated sheets
3. the side groups of the amino acids
4. the number and sequence of amino acids
C’ represents carbon of
1.sugar of nucleotides
2.Nitrogenous bases of nucleotides
3.Both 1 and 2
4.None of the above
In proteins, amino acids are linked by a type of
1.Acetyl bond
2.Amide bond
3.Ester bond
4.Glycosidic bond
The formation of amide bond shows which type of reaction
1.Substitution reaction
2.Elimination reaction
3.Addition reaction
4.Rearrangement reaction