<span>The mitochondria in eukaryotic cells originated from prokaryotic cells, bacteria that were once free-living. The mitochondria have their own DNA, which is inherited from the mother in most species. Similarly, plant cells have organelles called plastids which contain their own DNA and originated from free-living bacteria. The chloroplasts in plant cells, which convert the energy of sunlight into chemical energy via photosynthesis, are a kind of plastid, and they originated from bacteria that could do photosynthesis.</span>
The answer is A. The left brain is also called the interpreter. This part of the brain processes information and endeavors
to make sense/ rationalize the situation based
on past experiences. This was discovered
in the split-brain research by Roger
Sperry in 1970s.
The decline in bone breakdown and increased mineralization causes blood calcium to decrease <span>back to normal levels. This happens when there is secretion of calcitonin. This circulation calcitonin is inhibiting </span>osteoclasts<span> and it will stimulate osteoblasts within minutes. The effect of this on osteoclast will cause a decrease in reabsorption and a concurrent increase in deposition because of the osteoblasts activity.</span>
In eurkaryotes, the wrapping of DNA around nucleosome introduces negative supercoiling because negative super coil knots have high twisting stress and are less tightly packed.The combine loop of protein [histone] and chromosome is called nucleosome.
