Question 23 - High School Biology Practice Test for the STAAR test

Which of the four samples shown in the attached table is most likely to be a protein?

Sample Elemental Composition
1 C,H,O
2 C,H,O,P,N
3 C,H,O,N,S
4 Ca,K,N,P

The table above shows the elemental composition of four biological samples.

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