The macronucleus is the larger elipse-shaped nucleus and takes care of
functions like respiration and digestion. In contrast to this, the
smaller micronucleus is only involved in cell division or reproduction.
The best answer is C - DNA is heated to separate the strands.
PCR proceeds in three steps.
1. Denaturation - The DNA strands, which are bound together in the double helix, must be separated to allow replication to take place so the first step of PCR is to separate them. This is done by heating up the sample, breaking the hydrogen bonds between the strands.
2. Annealing - sample is cooled just enough to allow primers to bind to the ends of each of the two template strands.
3. Extension - DNA polymerase attaches to the primers and makes a copy of each template strand.
Mesozoic Era is the second of the Earth's major era geologically of the Phanerozoic time. It means middle life in Greek. The climate during this time was warm and had less difference in the temperature today thus the answer is a. About as warm as present.
<span>C.Each stage produces ATP, but only the first stage occurs in the cytoplasm.</span>
I would say D it seem to be the likely choice but not a 100%