Respiration Flashcards
1
Q
Name two molecules needed for aerobic respiration that can move into the mitochondria. (2)
A
- oxygen
- reduced NAD
1
Q
Explain the importance of the membrane not being permeable to hydrogen ions. (4)
A
- to stop H+ ions diffusing into cytoplasm
- so H+ ions can move down conc. gradient
- by chemiosmosis
- to synthesis ATP
2
Q
Explain the increase in blood lactate conc. from: 0-5 minutes. (2)
A
- due to aerobic respiration
- insufficient oxygen for aerobic respiration
3
Q
Why does blood lactate conc. remain constant b/w: 5-15 minutes. (3)
A
- sufficient oxygen supply
^ for aerobic respiration
- bcs heart rate increases
4
Q
Explain why some ATP is broken down during glycolysis. (2)
A
- ATP supplies energy to the break down of glucose
- to produce 3 carbon compounds
5
Q
Explain the role of carrier molecules in the electron transport chain. (3)
A
- to allow reduced NAD to be oxidised
- break hydrogen into H+ & e-
- electrons transferred by series of redox reactions
6
Q
Describe what happens to lactate in these cells. (2)
A
- converted to pyruvate
^ converted to glucose
7
Q
Explain the need for reduced NAD to be oxidised in a mitochondrion. (2)
A
- to allow chemiosmosis
- to regenerate NAD
