Chapter 6 Cellular Respiration

Question 1

Aerobic Cellular Respiration

Answer 1

Process of using glucose and O2 to produce ATP

Occurs in the mitochondria

Question 2

Chemical representation of cellular respiration

Answer 2

Inputs: glucose O2

Outputs: CO2, H2O and energy (ATP)

Question 3

4 steps of cellular respiration

Answer 3

Glycolysis
Intermediate (transition) step
Krebs cycle
Electron transport chain (ETC)

Question 4

Structure of the mitochondria

Answer 4

Two phospholipid bilayers, outer and inner (cristae)

Matrix- space within inner membrane (krebs)

Glycolysis occurs outside the organelle in the cytoplasm

Question 5

Glycolysis

Answer 5

Occurs in cytoplasm

No oxygen required

Splits glucose into 2, 3C molecules called pyruvate

(2)ATP produced (substrate level phosphorylation)

NAD+ picks up 2e-‘s to become NADH

Question 6

Intermediate Step

Answer 6

Requires O2, occurs in mitochondria

Converts each pyruvate into a 2c molecule (acetyl CoA)- the C stripped from each produce CO2

Releases CO2

Produces NADH

Question 7

Krebs Cycle (citric acid cycle)

Answer 7

Requires O2

2C molecule from intermediate joins a 4C molecule

CO2 released

ATP and NADH produced

Electron carrier FAD+ becomes FADH2

Question 8

Electron Transport Chain

Answer 8

Uses NADH and FADH2 from previous stages— e-‘s are stripped and H+ creates a proton gradient

34 ATP produces through chemiosmosis

O2 is the final e- acceptor (e- and H+ join with O2 to form H2O

Question 9

Total ATP yield from one glucose

Answer 9

Glycolysis and krebs-> 2ATP each

ETC-> 34ATP

TOTAL PRODUCTION: 36 ATP

Question 10

Fermentation

Answer 10

Produces less ATP than aerobic respiration (2ATP)

Does not require O2

Ends at glycolysis- produces an organic end product

Ex: yeast, lactic acid