What level of protein organization structure explains the 3-D shape of an enzyme?

1. primary structure	2. tertiary structure
3. secondary structure	4. quaternary structure

Given below is a schematic metabolic pathway. In an experiment, the concentration of enzyme 1 was increased but the concentration of enzymes 2 and 3 were kept constant. What would happen to the rate of production of D?

1. it would go down
2. it would go up
3. it would stay the same
4. it would stop

The graph shown below shows the effect of a certain factor on the rate of a reaction catalyzed by an enzyme. The X-axis would show the said factor and that will be:

In the following graph, the X-axis will show:

1. substrate concentration
2. enzyme concentration
3. pH
4. enzyme concentration or substrate concentration

The rate of enzyme action decreases at higher temperature [after a certain value] because the increased heat
1. changes the pH of the system
2. alters the active site of the enzyme
3. neutralizes the acids and bases in the system
4. increases the concentration of the enzyme

The "lock and key hypothesis", given be Emil Fischer, attempts to explain the mechanism of:
1. denaturation of enzyme proteins
2. the formation of peptide binds
3. sharing of electrons
4. enzyme specificity

At about \(0^\circ C\) , most enzymes are
1. inactive
2. active
3. destroyed
4. replicated

If an active-site directed inhibitor is present in the medium, the curve that will represent the progress of the chemical reaction will be shown by the letter:

If an non active-site directed inhibitor is present in the medium, the curve that will represent the progress of the chemical reaction will be shown by the letter:

1. D
2. C
3. B
4. A

Which of the following will fit in the description of a competitive enzyme inhibitor?
1. a highly reactive compound.
2. a metal ion such as Hg²⁺ or Pb²⁺.
3. structurally similar to the substrate.
4. water insoluble.