What does a cell membrane keeps a cells

The cell membrane is the lipid bilayer that encloses the cell, and therefore the cytoplasm which in turn contains the rest of organelles we can find in a cell.

All types of cells have a cell membrane but in plant cells it is no the outermost layer, being enclosed by the cell wall. In animal cells instead, the cell membrane is the outemost layer.

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BioTeacher101

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.