Biology Questions and Answers
ATPase, is fundamental to keep the
characteristicin the intracellular sid negative e of theelectrical charge
membrane of the resting cell and to
create adequate conand potassium concentrationsditions of sodium inside
and outside the cell to maintain the
cellular metabolism.
- What is mass
transportation across the cell
membrane?
Mass transpthe exiting oortationf substances is the entrance or in or from the (^)
cell engulfed by portions of membrane.
The fusion of internal substance-containing membranous vesicles with
the cell membrane is called exocytosis.
The entrance of substancesafter they have been engulfed by into th e cell
projections of the membrane is called
endocytosis.
- What are the two main
types of endocytosis?
Endocytosisin the cell engulfed by portions of is the entrance of material the
cell membrane.
Endocytosispinocytosis or phagocytosis. can be classified Inas
pinocytosis small particles on the
external sustimulate thrface oe invagination of the membranef the
membrane inwards and vesicles full of
that particlesmembrane and enter the cytoplasm. then detach from the (^) In
phagocytosisexternal surface o bigger particles on thef the membrane
induce the projection of pseudopods
outwards enclosing the particles; the
vesicle then detaches from the
membrane and enters the cytoplasmreceiving the name phagosome.
- How does the plant cell
wall react when it is placed
under hypotonic medium?
The plant ccell external ell wall (the covto the cell memering of thebrane) is
made of cellulose, a polymer of glucose.
When the cell is put under hypotonic
medium through osmosis. Init absorbs too muc that situation thh water (^) e
cell wall pressure acts to compensate
the osmoticexcessive increase pressure of the cellularthus forbidding
volume and the cell lysis.
- What is meant by suction
force of the plant cell? Does
the suction force facilitate or
make difficult the entrance of
water into the cell?
The suction fopressure of the plant crce (SF) is thell vacuole, i.e osmotice., (^)
of the vacuolar internal solution.
Since the vacuolar solution in comparison to cytosol it attractsis hypertonic
water thus increasing the cytosol
concentration. With of the vacuole the cytosolthe osmotic becomes action
hypertonic in relation to the exterior and
more water enters the cell.
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