Question

what will make the detection dye change color?
the presence of an enzyme that will convert the detection dye from clear to blue.
the presence of an enzyme that will convert the detection dye from blue to clear.
the temperature of the room.
the antibody will cause a conformation change in the dye molecule, making it turn blue.

Explanation:

In enzyme - linked detection assays (common in biology/biochemistry), detection dyes often change color due to enzyme action. Enzymes can catalyze reactions that change the dye's color. Room temperature generally doesn't directly cause such a specific dye color change (ruling out the third option). Antibodies typically don't directly cause a conformation change in the dye to make it blue in this context (ruling out the fourth option). The second option says the enzyme converts from blue to clear, but the question is about what makes it change color (implying a change to a detectable color, often a positive result is a color like blue from clear, so the first option where an enzyme converts the clear detection dye to blue makes sense as enzymes in such assays (e.g., ELISA) can catalyze substrate - dye reactions to produce a colored product.

Answer:

A. The presence of an enzyme that will convert the detection dye from clear to blue.