SAT Subject Biology Practice Question 18: Answer and Explanation

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Question: 18

4. Which of these releases carbon dioxide?

I. Lactic acid fermentation

II. Alcohol fermentation

III. Aerobic respiration

IV. Photosynthesis

A. I and II
B. I and III
C. II and III
D. II and IV
E. III and IV

Correct Answer: C


Aerobic respiration releases carbon dioxide as it breaks down glucose via the citric acid cycle. Alcohol fermentation also releases carbon dioxide, which is a by-product of the production of alcohol. In contrast, lactic acid fermentation does not release carbon dioxide but converts the carbon molecules to lactate. Photosynthesis uses carbon dioxide, rather than releasing it.

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