factors affecting enzyme reactions

Question 1

True or False: the greater the number of substrate molecules, the greater the number of collisions, and the greater the rate of reaction

Answer 1

True

Question 2

What is an enzyme that operates best in acidic condition?

Answer 2

Pepsin

Question 3

Where is pepsin found?

Answer 3

In the stomach

Question 4

True or False: the optimum temperature range for human enzyme = 32C

Answer 4

False. Optimum temp range for human enzyme = 37C

Question 5

Why do reaction rates in our cells peak at 37 C and then drop, even though the molecules are moving faster and colliding more often?

Answer 5

The fact that enzymes are proteins means that at high temps, proteins change shape or are denatured.

Question 6

What is Denature?

Answer 6

Temporary change in an enzyme

Question 7

Define Coagulate

Answer 7

Permanent distruction of enzyme

Question 8

What is Allosteric Activity?

Answer 8

A change in an enzyme caused by the binding of a molecule

Question 9

What is Feedback Inhibition?

Answer 9

As the product from a series of chemical reactions begins to accumulate within a cell, the product interferes with one of the enzymes. The interference slows the reaction rate, preventing the accumulation of finals products.

Question 10

Define Precursor Activity

Answer 10

When the substrate molecule combines at the regulatory site of one of the enzymes. The combination of the substrate and enzyme actually improves the fit of the enzyme-substrate complex. This speeds up the formation of final products.

Question 11

What is Competitive Inhibition?

Answer 11

When molecules with similar shapes compete with the substrate molecules for the active sites of the enzymes. As long as the inhibitors remain joined to the enzyme, the substrate cannot bind.

Question 12

What is Pepsin?

Answer 12

A protein-digesting enzyme that breaks the long amino acid chains in proteins into shorter chains