Question

1. When an enzyme runs a chemical reaction, what happens to the enzyme at the end of the reaction?

a) it is unchanged, and can run another reaction

b) it is weakened, and is slower the next time

c) it becomes part of the product, and is used up

d) it is permanently damaged, or destroyed

2. When an enzyme accelerates a reaction rate, what does the enzyme do, thermodynamically (energy-wise)?

a)lowers the activation energy for the reaction

b) allows endothermic reactions to go by making them exothermic

c) releases exothermic energy from the reactants

d) generates energy to run the reaction

3. Enzymes have what relationship with their reactants?

a)specific for general type of reaction

b)enzymes can run varied reactions in the cell

c)highly specific for just one reaction

d)can bind several reactants to do similar reactions

4. When you allosterically inhibit an enzyme,

a)you decrease the V max

b)you decrease the Km

c)you increase the V max

d)you increase the Km

Answer 1

Ans 1) Option (a) is correct.

An enzyme is a catalyst which speed up the reaction' without involving itself. It can help the substrate to be converted into product without involving in a chemical reaction.

Ans 2) Option (a) is correct.

Enzyme helps to lower the activation energy for any given reaction. Aap we lower the activation energy the reaction rate increases. Therefore , enzymes increase the reaction rate by lowering energy of activation.

Ans 3) Option (d) is correct.

Enzymes are selective and specific in nature. For every reactant there is one enzyme which works for that particular substrate but that particular reactant use that one enzyme for multiple times.

Ans 4) Option (b) is correct.

In uncompetitive inhibition the Km decreases as uncompatitive inhibitor tries to pull out the complex by reaction. Hence , Km decreases.

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