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honeysenpai6
15.04.2020 •
Biology
A cell with a predominance of smooth endoplasmic reticulum is likely specialized to .
A) store large quantities of water
B) import and export large quantities of protein
C) actively secrete large quantities of protein
D) synthesize large quantities of lipids
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Ответ:
D) synthesize large quantities of lipids
Explanation:
The basic function of smooth endoplasmic reticulum (so called because of absence of ribosomes attached to the membrane) is secretion and transport of lipids, phospholipds and steroids in cells.
They are mostly concentrated in cells of testes, sebaceous glands of the skin and ovaries. It is also present in muscle cells where it regulate ca+ concentration needed for muscles contraction.
it plays active role in glucose metabolism, steroid metabolism. detoxification of some product of metabolisms in the body. In addition it contains enzymes involved in the production of glucose from non-carbohydrate sources -gluconeogenesis .needed for muscles survival during glucose depletion.
When endoplasmic reticulum are attached by some ribosomes which makes their membrane rough, they are called rough endoplasmic reticulum. They are concerned with transport of proteins synthesized by ribosomes.
Ответ: