a ) Why is the cell membrane called selectively-permeable membrane?
b) Why are mitochondria called the powerhouse of the cell?
c) What are dictyosomes?
d) Identify the following organisms
ii) An oval unicellular aquatic organism.
iii) An oblong slipper shaped, single-celled organism found in stagnant water.
e) Draw a well labelled diagram of a nucleus.
f ) A single-celled irregularly shaped organism.
Answers
Answer:
(a) The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won't take place.
(b) Mitochondria are often called the “powerhouses” or “energy factories” of a cell because they are responsible for making adenosine triphosphate (ATP), the cell's main energy-carrying molecule.
(c) noun. plural: dictyosomes. (cell biology) Synonym: Golgi apparatus, i.e. the organelle that is comprised of membrane-bound stacks and is involved in glycosylation, packaging of molecules for secretion, transporting of lipids within the cell, and giving rise to lysosomes.
Answer:
a.cell membrane is called as selectively permeable membrane bze it is the outter surface ....
b. bze it contains some proteins through which it can generate the energy ...so this ia the reason it is called as power house of the cell....
c. i dont know ..means i dont have idea
d. i think hydra
ii. dont know....
e. hey mate what ia that que ..draw u r self...
f. amoeba