Chapter 5 -3 Flashcards Preview

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Flashcards in Chapter 5 -3 Deck (15):
1

What are the 2 types of reactions of energy coupling?

Exergonic & endergonic

2

Exergonic?

energy is released and reactants have more potential energy

3

Endergonic?

require energy input and products have more potential energy

4

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

ATP

5

How does ATP power cellular work?

by phosphorylation - transfer of high energy phosphate to some

6

Phosphorylated =

energized

7

What makes metabolism efficient?

Enzymes

8

What are enzymes?

specific type of proteins that function as acatalyic
that accelerate chemical reactions w/o being altered

9

Enzymes are?

substrate specific

10

What are active sites?

a pocket with a specific shape for substrate binding

11

What is the enzyme cycle?

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

12

Enzyme activity is influenced by?

environment
-temp, salt concentration, pH

13

What are the enzyme helpers?

non protein cofactors, coenzymes

14

What are cofactors?

metal ions of zinc, iron, etc

15

What are coenzymes?

organic molecules like vitamins, FAD, NAD