A researcher performed an experiment in which he exposed young potato plants to a radioactive form of carbon dioxide gas containing
carbon-14 instead of carbon-12. After several weeks, the researcher took tissue samples from the plants and isolated several different
types of organic molecules from them.
In which of the following types of molecules might the researcher find carbon-14?
A.
nucleic acids
B.
lipids
c. amino acids
D.
all of these