Chapter 6: Enzymes

Question 1

What are enzymes?

Answer 1

catalysts of biochemical reactions by reducing the energy

Question 2

In most cases, are enzymes unique to a given rxn (one enzyme-one substrate)?

Answer 2

Yes

Question 3

T of F: As catalysts enzymes emerge from the reaction unchanged, so they are recycled in the reaction, meaning only a small enzyme concentration is sufficient

Answer 3

True

Question 4

T or F: enzymes do not change equilibrium concentrations, do not change Keq of a reaction

Answer 4

True

Question 5

T or F: enzymes do change delta G, and do change endergonic into exergonic reactions.

Answer 5

False

Question 6

T or F: enzymes do not supply energy to drive an exergonic rxn

Answer 6

True

Question 7

What kind of proteins are enzymes?

Answer 7

globular

Question 8

What do prosthetic groups do in relation to enzymes?

Answer 8

help activate

Question 9

Small, inorganic molecule or ion

Answer 9

Cofactor

Question 10

organic molecule (larger)

Answer 10

Coenzyme

Question 11

Types of prosthetic groups

Answer 11

cofactor and coenzyme

Question 12

Examples of coenzymes

Answer 12

B vitamins and Vitamin C

Question 13

What does the graph look like when the reaction rate is a function of enzyme concentration?

Answer 13

increases linearly

Question 14

What does the graph look like when the reaction rate is a function of substrate concentration?

Answer 14

asymptomatic and approaches max reaction rate Vmax as substrate

Question 15

Environmental factors affect the shape of the enzyme protein, therefore its function.

Answer 15

Enzyme activity

Question 16

What are the environmental factors that affect the shape and function of enzyme protein?

Answer 16

pH and temperature

Question 17

What does the graph look like when pH is a factor?

Answer 17

hump increases quickly

Question 18

What does the graph look like when the temperature is a factor?

Answer 18

increases exponentially until max rxn rate is reached