41
Which of the following strategies are used by cells for metabolic regulation?
A)
P and Q only
B)
P and R only
C)
Q and R only
D)
P, Q and R
Answer & Solution
Answer: Option
D
42
Levinthal's paradox is related to
A)
Protein secretion
B)
Protein degradation
C)
Protein folding
D)
Protein trafficking
Answer & Solution
Answer: Option
C
43
An enzymatic reaction exhibits Michaelis-Menten kinetics. For this reaction, on doubling the concentration of enzyme while maintaining [S] >> [E0 ],
A)
Both KM and Vmax will remain the same
B)
KM will remain the same but Vmax will increase
C)
KM will increase but Vmax will remain the same
D)
Both KM and Vmax will increase
Answer & Solution
Answer: Option
B
44
In general, which one of the following statements is NOT CORRECT?
A)
Hydrogen bonds result from electrostatic interactions
B)
Hydrogen bonds contribute to the folding energy of proteins
C)
Hydrogen bonds are weaker than van der Waals interactions
D)
Hydrogen bonds are directional
Answer & Solution
Answer: Option
C
45
Which one of the following statements is CORRECT for enzyme catalyzed reactions? ( ΔG is Gibbs free energy change, Keq is equilibrium constant)
A)
Enzymes affect ΔG, but not Keq
B)
Enzymes affect Keq , but not ΔG
C)
Enzymes affect ΔG and Keq
D)
Enzymes do not affect ΔG or Keq
Answer & Solution
Answer: Option
A
46
ATP biosynthesis takes place utilizing the H+ gradient in mitochondria and chloroplasts. Identify the correct sites of H+ gradient formation.
A)
Across the outer membrane of mitochondria and across the inner membrane of chloroplast
B)
Across the inner membrane of mitochondria and across the thylakoid membrane of chloroplast
C)
Within the matrix of mitochondria and across the inner membrane of chloroplast
D)
Within the matrix of mitochondria and within the stroma of chloroplast
Answer & Solution
Answer: Option
B
47
An enzyme catalyzes a reaction by
A)
Decreasing the energy of the substrate
B)
Decreasing the activation energy of the reaction
C)
Decreasing product stability
D)
Increasing the activation barrier of the reaction
Answer & Solution
Answer: Option
B
48
Match the entries in
Group I with the enzymes in
Group II .
Group I Group II
P. NAD+
1. Glutathione peroxidase
Q. Selenium
2. Nitrogenase
R. Pyridoxal phosphate
3. Lactate dehydrogenase
S. Molybdenum
4. Glycogen phosphorylase
A)
P-3, Q-2, R-4, S-1
B)
P-4, Q-1, R-3, S-2
C)
P-3, Q-1, R-4, S-2
D)
P-3, Q-4, R-2, S-1
Answer & Solution
Answer: Option
C
49
Which one of the following need NOT be conserved in a biochemical reaction?
A)
Total mass
B)
Total moles
C)
Number of atoms of each element
D)
Total energy
Answer & Solution
Answer: Option
B
50
In zinc finger proteins, the amino acid residues that coordinate zinc are
A)
Cys and His
B)
Asp and Glu
C)
Arg and Lys
D)
Asp and Arg
Answer & Solution
Answer: Option
A
