Exam 2: homework questions

An enzyme speeds up a chemical reaction in the cell, but can only be used once.

false

enzymes are

proteins

Which of the following binds to the active site of an enzyme?

substrate

In feedback inhibition, the inhibitor of the biochemical pathway is typically

the final product of the biochemical pathway.

Which of the following statement(s) about biochemical pathways is(are) TRUE

they are very well organized and structured they convert an initial substrate via a series of steps into an end product

An enzyme can only bind one reactant at a time

true

In a biochemical pathway, the product of the first reaction becomes the substrate in the second reaction.

true

Consider the biochemical pathway: A - E1 -> B - E2 -> C Enzyme 1 can utilize:

only A as substrate

Consider the biochemical pathway: A - E1 -> B - E2 -> C If Enzyme 2 is inactive, which of the following compounds will accumulate?

B only

What is the ultimate effect of increasing the temperature on the speed of an enzymatic reaction?

Product will decrease. Enzyme will denature.

What is the initial effect of increasing the substrate concentration on the speed of an enzymatic reaction?

Product will increase. More active sites will be filled.

What is the initial effect of increasing the temperature on the speed of an enzymatic reaction?

Product will increase. More collisions between enzyme and substrate.

What is the ultimate effect of increasing the substrate concentration on the speed of an enzymatic reaction?

Reaction rate will plateau.

Consider the biochemical pathway used to synthesize the amino acid proline. A high increase in the level of proline will most likely lead to:

a decrease in proline production.

What does the inhibitor bind to during feedback inhibition?

allosteric site of the enzyme being inhibited