[Nicolas Sanchez]

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Which of the following is/are included in the carbon cycle?

1 amino acids in an animal
2 cellulose in a plant cell wall
3 lipids in a bacterial cell membrane
A. none of them
B. 1 only
C. 2 only
D. 3 only
E. 1 and 2 only
F. 1 and 3 only
G. 2 and 3 only
H. 1, 2 and 3

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Discussion

[Paris]

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If the substance mentioned has carbon, then it is a part of the carbon cycle.

1. Amino acids have carbons. So they are part of the cycle.

2. Cellulose is these abundant organic polymer on earth. It is correct.

3. Lipids have fatty acids which contain long carbon chains. This is correct.

The answer is H.