Deuterated acetyl-coenzyme A (-CD3 instead of –CH3) was used in an experiment to study the TCA cycle. Upon analysis of the metabolites, it was found that deuterium (D) was present in a wide variety of compounds; even compounds not associated with the citric acid cycle. This is due to

#Question id: 637

#Unit 1. Structure and Function of Biomolecules

Effect of temperature on enzymatic catalysis is analysed by the rate v of a chemical reaction varies with temperature according to the Arrhenius Equation which explains the sensitivity of enzyme reactions to temperature. A plot to determination of the activation energy Ea involves

#Question id: 638

#Unit 1. Structure and Function of Biomolecules

Match the following class of enzymes with them

#Question id: 639

#Unit 1. Structure and Function of Biomolecules

Match the coenzymes in column I enzymes to class of enzymes in column II

#Question id: 640

#Unit 1. Structure and Function of Biomolecules

The data in the table above were collected for an enzyme-catalyzed reaction. The Km for this enzyme is approximately

#Question id: 641

#Unit 1. Structure and Function of Biomolecules

Which of the following does NOT describe a mechanism that cells use to regulate enzyme activities?

A. Cells control enzyme activity by phosphorylation and dephosphorylation.

B. Cells control enzyme activity by the binding of small molecules.

C. Cells control the rates of diffusion of substrates to enzymes.

D. Cells control the rates of enzyme degradation.

E. Cells control the rates of enzyme synthesis.

F. Cells control the targeting of enzymes to specific organelles. 

#Question id: 642

#Unit 1. Structure and Function of Biomolecules

The graphs P, Q and R show the variation of rate constant (k) with temperature. The reactions represented by P, Q and R, respectively, are