Question

two different species are examined. scientists find that species x always produces co₂ and h₂o during cellular respiration. species y always produces ethyl alcohol and co₂. neither species will produce the other’s products. which conclusion can be made from these observations? a only species y is aerobic b only species y is anaerobic c both species x and y are aerobic d both species x and y are anaerobic

Explanation:

• Aerobic respiration produces \( \text{CO}_2 \) and \( \text{H}_2\text{O} \), so Species X (produces \( \text{CO}_2 \) and \( \text{H}_2\text{O} \)) is aerobic.
• Anaerobic respiration (like alcohol fermentation) produces ethyl alcohol and \( \text{CO}_2 \), so Species Y (produces ethyl alcohol and \( \text{CO}_2 \)) is anaerobic.
• Option D is wrong (X is aerobic, Y is anaerobic). Option B is wrong (Y is anaerobic, not aerobic). Option A is wrong (Y is anaerobic). Option C is correct as X is aerobic (from its products) and Y is anaerobic (from its products)? Wait, no—wait, the question's options: Wait, the options are: A: only Y is aerobic; B: only Y is anaerobic; C: both X and Y are aerobic; D: both X and Y are anaerobic. Wait, no, re - reading: Species X produces \( \text{CO}_2 \) and \( \text{H}_2\text{O} \) (aerobic respiration products). Species Y produces ethyl alcohol and \( \text{CO}_2 \) (anaerobic, alcohol fermentation). So:
• Option A: "only species Y is aerobic" → wrong, Y is anaerobic.
• Option B: "only species Y is anaerobic" → correct? Wait, no—X is aerobic (so not anaerobic), Y is anaerobic. So "only Y is anaerobic" is correct? Wait, the original selected option was D, but that's wrong. Wait, let's re - analyze:

Aerobic respiration: \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2
ightarrow6\text{CO}_2 + 6\text{H}_2\text{O}+\text{energy} \) (products \( \text{CO}_2 \) and \( \text{H}_2\text{O} \)). So Species X does aerobic respiration (is aerobic).

Anaerobic respiration (alcohol fermentation): \( \text{C}_6\text{H}_{12}\text{O}_6
ightarrow2\text{C}_2\text{H}_5\text{OH}+2\text{CO}_2+\text{energy} \) (products ethyl alcohol and \( \text{CO}_2 \)). So Species Y does anaerobic respiration (is anaerobic).

Now, let's check the options:

A. only species Y is aerobic → Y is anaerobic, so wrong.

B. only species Y is anaerobic → X is aerobic (not anaerobic), Y is anaerobic. So this is correct.

C. both species X and Y are aerobic → Y is anaerobic, so wrong.

D. both species X and Y are anaerobic → X is aerobic, so wrong.

Wait, but the original selection was D, which is incorrect. The correct answer should be B.

Answer:

B. only species Y is anaerobic