4.2.3 Anaerobic Respiration: The Fermentation of Pyruvate Flashcards
1
Q
Review:
A
- In the process of glycolysis, a net profit of two ATP was produced, two NAD+ were reduced to two NADH + H+, and glucose was split into two pyruvate molecules.
2
Q
fermentation
A
- When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue.
3
Q
alcohol fermentation
A
- First, pyruvate is decarboxylated (CO2 leaves) to form acetaldehyde. Hydrogen atoms from NADH + H+ are then used to help convert acetaldehyde to ethanol. NAD+ results.
4
Q
Facultative anaerobes
A
- organisms that can undergo fermentation when deprived of oxygen. Yeast is one example of a facultative anaerobe that will undergo alcohol fermentation.
5
Q
lactate fermentation
A
- Two pyruvates are converted to two lactic acid molecules, which ionize to form lactate. In this process two NADH + H+ are converted to two NAD+
- Our muscle cells can undergo this process when they are in oxygen debt. If enough oxygen is not present to undergo aerobic respiration, pyruvate will undergo lactic acid fermentation.
6
Q
Which of the following statements is true regarding fermentation?
A
- It produces a NAD+
7
Q
True or false?
Glycolysis yields more ATP than fermentation alone.
A
- true
8
Q
Fermentation enables
A
- NADH + H+ to be oxidized to form NAD+ so that glycolysis will continue
9
Q
Fermentation
A
- does not require oxygen
10
Q
Which statement regarding fermentation is true?
A
- In alchohol fermentation, pyruvate is first converted to acetaldehyde in a decarboxylation reaction and then converted to ethanol, forming NAD+
11
Q
What is the electron acceptor during lactic acid fermentation?
A
- pyruvate
12
Q
Fermentation differs from cellular respiration because
A
- fermentation does not require oxygen
13
Q
Which of the following molecules is reduced during alcohol fermentation?
A
- acetaldehyde
14
Q
An important principle of fermentation is that
A
- O2 is not used as a final electron acceptor
