Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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**Question:**

When the first cells evolved, Earth's atmosphere was ________. The first cells used the process called ______________ to make a small amount of ATP.

**Options:**

- oxic; anaerobic respiration
- anaerobic; oxygenic photosynthesis
- anaerobic; fermentation
- aerobic; aerobic respiration

In this multiple-choice question, a key evolutionary concept is explored regarding the atmosphere and energy production in early cellular life. Initially, Earth’s atmosphere lacked oxygen, making it anaerobic. The first cells likely relied on fermentation to produce ATP, as oxygen-dependent processes like aerobic respiration had not yet evolved.
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Transcribed Image Text:**Question:** When the first cells evolved, Earth's atmosphere was ________. The first cells used the process called ______________ to make a small amount of ATP. **Options:** - oxic; anaerobic respiration - anaerobic; oxygenic photosynthesis - anaerobic; fermentation - aerobic; aerobic respiration In this multiple-choice question, a key evolutionary concept is explored regarding the atmosphere and energy production in early cellular life. Initially, Earth’s atmosphere lacked oxygen, making it anaerobic. The first cells likely relied on fermentation to produce ATP, as oxygen-dependent processes like aerobic respiration had not yet evolved.
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