Biology Questions and Answers
addition, after one transport job is
concludeconsumed, the permease is nd and can perform otherot (^)
successive transports.
- What are some examples
of biological activities in which
osmosis plays an important
role?
Hemolysiscells) by entrance o (destructionf water, of red bloodthe hydric (^)
regulation in water in the xylem plants anof vasculard the entrance o plants f
are all examples of biological
phenomena caused by osmosis.
Excessive dilution of the blood plasma
causes, bmuch water y osmosis,into red blood cells an the entrance of tood
then the destruction of these cells
(hemolysis).process for mainte Osmosisnance o is also the maif the flaccid,n (^)
turgid or plasmolytic states of plant
cells. Osmosis isresponsible for the entrance one of the forcesof water (^)
into plant rhypertonic in comoots since roparison to ot cells arethe soil.
- What do facilitated
diffusion and active transport
have in common? What are
the differences between
them?
Facilitated diffusion can be confused
with active transprocesses there is participationport because in both of
membrane proteins.
In active transport however the
transported substance concentration gradient and with emoves against itsnergy
spent. Facilitated diffusion is a passive
transport in favor of the concentrationgradient and it does not require energy.- Which are the molecules
that make possible active
transport through
membranes?
Active transpomembrane proteins. These proteins arert is made by specific (^)
called “pumps” because they “pump”
the movimembrane using energy from ATPng substance through the
molecules.
- How does the sodium-
potassium pump present in
the cell membrane work?
What is the importance of this
protein for the cell?
The sodium-ptransport protein that maiotassium pump is thntains thee (^)
concentration gradient of these ions
between the intra and the extracellularspaces. This protein is phosphorylated
in each pumping cycle anpumps three sodium ions outside d then it (^) the
cell and puts two potassium ions
inwards. The phosphorylationby the binding of a phosphate donated is made (^)
by one ATP molecule that then is
converted into ADP (adenosinediphosphate).
The job of the sodiumalso known as sodium-p-potassiumotassium pump,
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