The enzyme $\beta$-galactosidase acts on lactose to form galactose.In turn,the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose.In this case,lactose is serving as a carbon source and as a(n)

Question

Quizplus · Accepted Answer

The mention of lactose acting as an "inducer" suggests that it is serving as a signal molecule that triggers the expression of genes involved in galactose metabolism. Therefore, option A - inducer - is the best choice. Option B - repressor - is incorrect as lactose is not inhibiting gene expression. Option C - effector - is an ambiguous term without enough context to be certain of its relevance here. Option D - operon - is also a possibility given the mention of multiple genes involved in galactose metabolism being expressed, but inducer more directly captures the role of lactose in this case.

The Enzyme β\betaβ -Galactosidase Acts on Lactose to Form Galactose

The Enzyme $\beta$ -Galactosidase Acts on Lactose to Form Galactose