Biology Questions and Answers
paramecium, have two nuclei: the
macronucleus and the micronucleus.
- What are the respective
functions of the macronucleus
and of the micronucleus in the
paramecium?
The macronucleus is properly the cell
nucleus, it has the center of the cellular coas DNA and RNA and actsntrol an (^) d
regulation. The micronucleus has
reproductive functions ato the conjugation process (sexualnd it is related
reproduction).
- What do protozoans “eat”?
Do they move in search for
food?
Protozoans are they do not make theterotroph beings, i.e.,heir own food and
thus they need to search environment. Protozans havfor it in thee developed (^)
several locomotion they actively move towards fmechanisms andood.
- How do amoebae,
paramecia and trichomonas
respectively move?
Amoebae move by amoeboidmovements, small projections (^) and
invaginations of their plasma membrane
(pseudopods) tmorphology of the cell making it mhat alter the externalove (^)
on surfaces. Paramecia have the outer
face of their plasma memby cilia that flap helping the cell tobrane covered
move. Trichomonas are flagellated
protozoalong filaments ons, i.e., thutside they have relativelye cell that beat (^)
and make possible active swimming in
fluid environments.
- How is digestion performed
in protozoans?
Digestion idigestion: organic material isn protozoans is intracellular
internalized and degraded inside the
cell.
Protozoans get food by phagocytosis
and then the food is digested whenphagosomes fuse with lisosomes within (^)
the cell, forming digestive vacuoles. The
digestive vacuoles givbodies that are eliminatee origin to residuald from the cell
by exocytosis.
In the paramecium the entrance of food
into the cell and the excretion odigestive residuals occur at specializedf (^)
regions of the plasma membrane, the
cytostomrespectively. and the cytopyge,
- Are protozoans presenting
contractile, or pulsatile,
vacuoles easily found in fresh
or in salt water?
Fresh water is thsolutes than sea e less concentrated water and it (fresh of
water) tends to be less concentrated
than the intracellular emaking cells to swell. Snvironmentea water, o (^) n the
other hand, since it is very concentrated
tends to dehydrate the cell.
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