Plant cells need both chloroplasts and the Mitochondria because they are perform both the photosynthesis and the cell respiration. Chloroplast converts the light (solar) energy into the chemical energy during the photosynthesis, while the mitochondria, is the powerhouse of the cell produces the ATP- the energy currency of the cell during the respiration.
Mitochondria are the membrane-bound cell organelles (mitochondrion, singular) that generate the most of the chemical energy which are needed to the power of the cell's as biochemical reactions. Chemical energy is produced by the mitochondria which is stored in small molecule that is called adenosine triphosphate (ATP).
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The best answer is Hormone.
Hormones are chemicals secreted by one tissue and affect the functioning of other tissues and cells.
Hormones are secreted by glands of the endocrine system. They are secreted into the blood and also extracellular fluid. They then circulate in the blood and come into contact with essential all cells, but a specific hormone will only affect a limited number of cells, namely the cells that bear a receptor for that hormone.
Red blood cells for example have receptors for the insulin hormone that is produced by the pancreas. They will therefore be directly affected by insulin while all other cells in the blood remain oblivious of this hormone..
I believe it’s B. DNA is a polymer made of nucleotide monomers
Answer:
Scientists believe that the different types we know emerged as early humans adapted to infectious diseases.
Explanation:
Different human blood types probably emerged to ward off infectious diseases. The incompatibility of some blood types, however, is only an "accident" of evolution. But this is a relatively recent problem, since blood transfusion has been around for only a few hundred years.
There are four main blood types. The oldest is B, which must have originated about 3.5 million years ago - it existed even before the human species evolved from its hominid ancestors, from a genetic mutation that modified one of the sugars in the surface of red blood cells.
Approximately 2.5 million years ago, mutations inactivated sugar, resulting in type O blood, which has neither type A nor B. sugar. AB blood, as it is easy to suppose, is covered by both sugar A and sugar by B.
