Cellular Respiration

Question 1

Define cellular respiration

Answer 1

Process of breaking down organic molecules to form chemical energy

Question 2

Steps of respiration

Answer 2

Glycolysis, pyruvate oxidation, Kreb’s cycle, electron transport chain

Question 3

Explain glycolysis and where it takes place

Answer 3

Cytoplasm; Glucose is converted into two 3-carbon molecules called pyruvate

Question 4

What is the net total of glycolysis?

Answer 4

2 ATP, 2 pyruvate, 2 NADH

Question 5

Explain pyruvate oxidation and where it takes place

Answer 5

Mitochondria; pyruvate is oxidized and converted into Acetyl-CoA. Electrons are transferred to NAD+ which creates NADH; carbon is lost so carbon dioxide is formed

Question 6

Describe the Kreb’s cycle

Answer 6

Takes place in mitochondrial matrix; Acetyl-CoA is oxidized to carbon dioxide through series of redox reactions

Question 7

What is the net total for the Kreb’s Cycle?

Answer 7

For each glucose molecule: 8 NADH, 2 FADH2, 2 ATP, 6CO2

Question 8

Describe the electron transport chain

Answer 8

Takes place in inner membrane of mitochondria; electrons are transferred from one acceptor to another, processing ATP

Question 9

What is the terminal electron acceptor in the ETC?

Answer 9

Oxygen; it is reduced to form water (by-product of respiration)

Question 10

What is the (rough) net total of respiration?

Answer 10

Up to 38 molecules of ATP

Question 11

What is fermentation?

Answer 11

Anaerobic respiration, the breakdown of glucose without oxygen