What repair enzyme/mechanism is responsible for cutting out errors in the dna? question 17 options: polymerase helicase nuclease none of the above.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?