Cellular Respiration Flashcards Preview

Biology 107 > Cellular Respiration > Flashcards

Flashcards in Cellular Respiration Deck (36)
Loading flashcards...
1

What is cellular metabolism

the sum of all chemical reactions in a cell

2

Point of cellular respiration?

Convert energy stored in glucose to ATP

3

Order of the three phases?

Glycolysis -> Citric acid cycle -> oxidative phosphorylation

4

Where does Glycolysis occur

In the cytoplasm (anaerobic)

5

What is the point of Glycolysis

Begin oxidation of Glucose

6

First reaction of Glycolysis?

Hexokinase (addition of inorganic Pi from ATP makes glucose more reactive)

7

Third reaction of Glycolysis?

Phosphofructokinase (another ATP required to phosphorylate the sugar)

8

Meaning of phosphorylate?

Introduce a phosphate group into a molecule

9

What happens after phosphofructokinase?

Glucose is split into 2x3C (G3P)

10

Two phases of Glycolysis?

Energy investment (Hexokinase & phosphofructokinase) and energy payoff

11

First step of energy payoff phase?

NADH is produced from NAD+ (organic C has been partially oxidized)

12

The first reactions of the energy payoff phase occur __ times each

two

13

What is substrate level phosphorylation?

When energy for ATP synthesis comes from the dephosphorylating of a substrate (losing P)

14

How many ATP does Glycolysis provide per Glucose?

Two (2 used, 4 produced)

15

How many NADH are produced per Glucose in Glycolysis

two

16

What is the product of Glycolysis?

Pyruvate (3C)

17

What is the site of cellular respiration?

Mitochondria

18

How many times does Glycolysis happen per glucose?

twice

19

Pyruvic acid is _______ into Acetyle CoA by ________ when pyruvate enters the ___________ because otherwise it is ____________.

1. oxidized
2. Coenzyme A
3. mitochondria
4. impermeable

20

How many carbons in acetyl CoA

two

21

Point of Krebs/Citric acid cycle?

Complete oxidation of glucose (CH -> CO2)

22

Where does the Krebs cycle occur?

In the matrix

23

What is FADH2?

Another type of electron carrier (lower energy electrons than NADH)

24

How many times does the Krebs cycle turn per Glucose?

Twice

25

How many ATC are produced by the Krebs cycle?

Two

26

What is the strongest oxidizing agent?

oxygen

27

What happens at the end of the electron transport chain?

Oxygen is reduced (O2 -> H2O)

28

What is Chemiosmosis

Synthesis of ATP using an H+ gradient

29

Where does the energy for chemiosmosis come from (difference btw Photosynthesis and Cell Resp)

In photosynthesis: energy for H+ gradient comes from light (Photophosphorylation)
In Cell resp: energy for H+ gradient comes from redox reactions: glucose (oxidative phosphorylation)

30

When does fermentation occur

O2 depleted in environmen