Question

a student used the concepts below to explain their understanding of how a gene coded code for the enzyme lactase

1. cells in certain tissues contain the gene coding for the enzyme lactase.
2. the specific sequence of the gene determines the shape of the lactase enzyme.
3. the shape of the lactase enzyme determines its function

what feedback would you provide this student explanation to best help them improve their explanation?
a your explanation is on the right track, but you need to revise the first sentence because cells in all tissues contain the gene coding for the enzyme lactase.
b your explanation is on the right track, but you need to revise the second sentence because the shape of the enzyme is determined by whether or not someone drinks milk.

Explanation:

The student's first statement is incorrect because almost all somatic cells in an organism contain the full set of genes, including the lactase gene, not just cells in certain tissues. Gene expression (whether the gene is used to make the enzyme) is what varies by tissue, not the presence of the gene. The other two statements about the gene sequence determining enzyme shape and enzyme shape determining function are correct. Feedback should address this error in the first point.

Answer:

A. Your explanation is on the right track, but you need to revise the first sentence because cells in all tissues contain the gene coding for the enzyme lactase.