What type of genes provide instructions for building proteins?

What type of genes provide instructions for building proteins?

• A. Regulatory genes
• B. Ribosomal RNA genes
• C. Housekeeping genes
• D. Protein-coding (or Structural) genes.

Answer: (D)

The main idea here is that the instruction manual for making proteins is contained in protein-coding genes. These genes carry the code that, when transcribed into mRNA and then translated, yields a polypeptide chain that folds into a functional protein. In other words, they directly provide the blueprint for protein sequences. Ribosomal RNA genes, by contrast, code for RNA components of ribosomes rather than proteins, so they don’t give instructions to build a protein. Regulatory genes produce proteins that control when, where, or how much other genes are expressed; their products influence protein production but are not the direct template for assembling most proteins. Housekeeping genes describe a set of essential functions and are typically protein-coding themselves, but the question is asking for the type that provides the actual instructions to build proteins, which is the protein-coding category.

The main idea here is that the instruction manual for making proteins is contained in protein-coding genes. These genes carry the code that, when transcribed into mRNA and then translated, yields a polypeptide chain that folds into a functional protein. In other words, they directly provide the blueprint for protein sequences.

Ribosomal RNA genes, by contrast, code for RNA components of ribosomes rather than proteins, so they don’t give instructions to build a protein. Regulatory genes produce proteins that control when, where, or how much other genes are expressed; their products influence protein production but are not the direct template for assembling most proteins. Housekeeping genes describe a set of essential functions and are typically protein-coding themselves, but the question is asking for the type that provides the actual instructions to build proteins, which is the protein-coding category.