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: Option A
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Which one of the following is INCORRECT about protein structures?
A. A protein fold is stabilized by favorable noncovalent interactions
B. All parts of a fold can be classified as helices, strands or turns
C. Two non-covalent atoms cannot be closer than the sum of their van der Waals radii
D. The peptide bond is nearly planar
Which one of the following amino acids has three ionizable groups?
A. Glycine
B. Leucine
C. Valine
D. Lysine
During lactic acid fermentation, net yield of ATP and NADH per mole of glucose is
A. 2 ATP and 2 NADH
B. 2 ATP and 0 NADH
C. 4 ATP and 2 NADH
D. 4 ATP and 0 NADH
The reactions leading to the formation of amino acids from the TCA cycle intermediates are
A. Carboxylation
B. Isomerization
C. Transamination
D. Decarboxylation
Enzymes do not change del G. It can only change the Activation energy. Hence D. will be the correct answer.