Chapter 6: Microbial Metabolism: Cellular Respiration Flashcards
1
Q
What are the three stages of cellular respiration?
A
- glycolysis
- krebs cycle (TCA)
- ETC
2
Q
What is glycolysis? (2)
A
- splitting of sugar
- does not require oxygen
3
Q
What occurs in glycolysis? (4)
A
- sequence of 10 reactions
- 1 glucose is converted into 2 molecules of pyruvate
- small amount of energy is released:
– 2 ATP and 2 NADH
4
Q
What is the Krebs cycle?
A
- pyruvate is broken down completely to CO2
5
Q
What does the krebs cycle produce? (3)
A
-2 ATP
- 8 NADH
- Other electron carriers (FADH2)
6
Q
Where does the krebs cycle occur in bacteria and in eukaryotes?
A
bacteria - cytoplasm of bacterial cell wall
Eukaryotes - mitochondria
7
Q
What occurs in the ETC? (2)
A
- electrons from NADH are transported through a series of electron carriers
- at the end of the chain, electrons are deposited on O2
1/2O2 + 2e + 2H+ –> H20
8
Q
Where does the ETC occur in bacteria and in eukaryotic cells?
A
bacteria - cell membrane
eukaryotes - mitochondrial membrane
9
Q
How many ATP are generated in oxidative phosphorylation?
A
34
10
Q
In the ETC, what is the energy that is released used to make? How many per NADH?
A
- ATP
- Makes 2-3 ATP per NADH
11
Q
IN TOTAL, how many ATP are produced per glucose in cellular respiration?
A
32-38
