One gene controls the synthesis of one

one polypeptide.

Explanation:

Genes are the nucleotide sequence present in the DNA or RNA which are passed to the next generation and are responsible for giving some characteristics to the offspring.

According to the one gene one polypeptide hypothesis one gene is responsible for the synthesis of one polypeptide. Earlier it was thought that one gene synthesizes one enzyme but later it was found that gene also codes single polypeptides and non-enzyme proteins.

Therefore a single gene controls the synthesis of one polypeptide.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above