Question

a nucleic acid that consists of one polynucleotide chain that helps in making proteins in a cell is ______ a nucleotides b polynucleotides c trna d dna

Explanation:

To solve this, we recall the roles of different nucleic acids. tRNA (transfer RNA) has a single polynucleotide chain and its function is to transfer amino acids during protein synthesis, helping in making proteins. Nucleotides are the building blocks, not the molecule helping in protein synthesis directly. rRNA is part of ribosomes, and DNA is double - stranded and mainly for storage. So the nucleic acid with one polynucleotide chain that helps in making proteins is tRNA.

Answer:

c. tRNA