During replication in the nucleus, what is responsible for pairing with DNA nucleotides on the open strand?

Apart of an ecosystem that can restrict the growth of a population is referred to as

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

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