Question

a diagram of protein synthesis is shown.
what is represented by molecule x in the diagram?
○ dna
○ mrna
○ rrna
○ trna

Explanation:

The diagram shows protein synthesis: DNA in the nucleus is used to make a transcript that moves to the cytoplasm, where ribosomes read it to assemble amino acids into a polypeptide chain. Molecule X blocks the step where the transcript leaves the nucleus, which is mRNA (the messenger RNA that carries DNA's code to ribosomes). DNA stays in the nucleus, rRNA forms ribosomes, and tRNA delivers amino acids, so they don't match this role.

Answer:

○ mRNA