Question

select the correct answer.
protein x is produced in the liver cells of the body. however, this protein is not produced within the intestine. which statement best explains why?
a. the gene for protein x is present in the intestinal cells, but it is not expressed.
b. the gene for protein x is not present in the intestinal cells.
c. the gene for protein x is present in the liver cells, but it is not expressed.
d. the gene for protein x is not present in the liver cells.

Explanation:

In a multicellular organism, almost all cells have the same genome (all genes), but different cells express different genes (gene expression) based on function. Liver cells produce Protein X, so the gene is present and expressed there. Intestinal cells have the gene for Protein X (same genome as liver cells) but don't express it (since Protein X isn't made there). Option B is wrong because intestinal cells have the gene. Option C is wrong as the gene is expressed in liver. Option D is wrong as liver cells have the gene. So A is correct.

Answer:

A. The gene for protein X is present in the intestinal cells, but it is not expressed.