80. Genes that code for repressor or activator proteins that regulate metabolic enzymes.
are usually constitutive and produce
their protein products constantly.
b. are usually regulated by a regulon.
are never seen in prokaryotic cells.
d. are always seen in prokaryotic cells but
never in eukaryotic cells.
e. None of the above are true.
​

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.