Question

which best summarizes the process of protein synthesis?
rna instructs dna to make proteins.
dna unzips, resulting in the formation of two protein molecules.
rna moves the dna code to the ribosomes for protein synthesis.
dna makes proteins in the nucleus.

Explanation:

• In protein synthesis, DNA is transcribed into mRNA (messenger RNA) in the nucleus. The mRNA then moves to the ribosomes (in the cytoplasm). The ribosomes use the code on the mRNA (which is based on the DNA code) to assemble amino acids into proteins.
• Option 1: DNA contains the genetic information. RNA (mRNA, tRNA, rRNA) is involved in the process of using that information to make proteins, not the other way around (RNA instructing DNA).
• Option 2: When DNA unzips during replication, it forms two DNA molecules, not protein molecules.
• Option 4: DNA does not directly make proteins. It provides the code, and the actual synthesis of proteins (using amino - acids) occurs at the ribosomes (with the help of RNA).

Answer:

RNA moves the DNA code to the ribosomes for protein synthesis.