When did the level of oxygen in Earth's atmosphere become high enough to sustain aerobic respiration?
A) 1.0 billion years ago
B) 3.5 billion years ago
C) 1.5 billion years ago
D) 2.7 billion years ago
Correct Answer:
Verified
Q29: The mitochondrial cristae are an adaptation that
A)carefully
Q30: The end products of the citric acid
Q31: During cellular respiration,NADH
A)is reduced to form NAD+.
B)delivers
Q32: The end products of glycolysis include
A)citric acid.
B)O2.
C)acetyl
Q33: If you consume 1 g of each
Q35: Which of the following processes produces the
Q36: In biological systems,an important enzyme involved in
Q37: At the end of the citric acid
Q38: Which step of the citric acid cycle
Q39: In fermentation,is .
A)NAD+ ...oxidized
B)NADH ...oxidized
C)NADH ...reduced
D)ethanol ...oxidized
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