If I am wearing a red shirt and blue shorts and walk into a room with only blue
light, what color will the shirt appear?

red

Explanation:

the shirt will probably appear red because the colour blue is quite light and the colour red is much darker and deeper which means it can be seen in blue light.

Your shirt will appear black

Explanation:

When you are wearing a red shirt, only red light from molecules scattering in the air. The naked eye can only see the color of the shirt if the color light reflects off the object, in this scenario red light is the only bounces off the red shirt giving the shirt a color of redness to the human eye. When blue light is only presented in the room with the red shirt, the blue light will bounce off the red shirt. The shirt wouldn't be red anymore, and appear black. This happens because the blue is absorbed no red light is remaining to go on the shirt.

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.