which one of the statements describes an event that takes place during gene regulation at the level of the chromosome?

Chromatin is remodeled and nucleosomes are repositioned, thereby making specific regions of the DNA available for transcription

The answer is option a.

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature