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Major Elements in Biological Molecules
Grade Level
AP Biology
APB.078 Major Elements in Biological Molecules
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A student compares element labels from four representative class models and notices that some labels are class-specific. Which rule should guide the final common-elements row?
A
Include phosphorus because it appears in the nucleic acid model, even if absent elsewhere.
B
Include only the elements that appear across all four models: carbon, hydrogen, and oxygen.
C
Include nitrogen only and remove carbon, hydrogen, and oxygen from the row.
D
Include sodium and chloride because ions are common in cells, regardless of the model labels.
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