Chapter 5 -3

Question 1

What are the 2 types of reactions of energy coupling?

Answer 1

Exergonic & endergonic

Question 2

Exergonic?

Answer 2

energy is released and reactants have more potential energy

Question 3

Endergonic?

Answer 3

require energy input and products have more potential energy

Question 4

What is the main energy coupling molecule that powers cellular work?

Answer 4

ATP

Question 5

How does ATP power cellular work?

Answer 5

by phosphorylation - transfer of high energy phosphate to some

Question 6

Phosphorylated =

Answer 6

energized

Question 7

What makes metabolism efficient?

Answer 7

Enzymes

Question 8

What are enzymes?

Answer 8

specific type of proteins that function as acatalyic

that accelerate chemical reactions w/o being altered

Question 9

Enzymes are?

Answer 9

substrate specific

Question 10

What are active sites?

Answer 10

a pocket with a specific shape for substrate binding

Question 11

What is the enzyme cycle?

Answer 11

1. Substrate binds to active site induced fit
2. Transition state produces products
3. Products are released
4. Active site ready for substrate

Question 12

Enzyme activity is influenced by?

Answer 12

environment

-temp, salt concentration, pH

Question 13

What are the enzyme helpers?

Answer 13

non protein cofactors, coenzymes

Question 14

What are cofactors?

Answer 14

metal ions of zinc, iron, etc

Question 15

What are coenzymes?

Answer 15

organic molecules like vitamins, FAD, NAD