What would happen if the plasma membrane ruptures or breaks down?
Ans : Plasma membrane is a selectively permeable membrane of the cell that maintains
its homeostasis, i.e., constant internal composition of the cell. If it ruptures or
breaks down the constant internal chemical composition of the cell will be lost
and it will not be able to perform its basic functions. Such a cell with ruptured
plasma membrane is killed.
What would happen to the life of a cell if there is no Golgi apparatus?
Ans : The materials synthesized in the ER are stored, sorted, modified, packaged and
dispatched to various targets inside and outside the cell through the Golgi
apparatus packs products in vesicles, the secretary vesicles. In some cases
complex sugars e.g. cellulose, may be made from simple sugars in Golgi
apparatus. The Golgi apparatus is also involved in the formation of the cells which
will not be possible if Golgi apparatus is not there.
Which organelle is known as the powerhouse of the cell? Why?
Ans : Mitochondria are known as the powerhouse of the cell because they contain enzymes that are needed for stepwise oxidation of food stuffs (carbohydrate, fats and lipids) present in the cells to CO2 and water. Oxidation of food releases energy which is used to form high-energy ATP (adenosine triphosphate) molecules. ATP is known as Energy Currency of the cell and it is used as cellular fuel. Energy stored in ATP is used to bring about energy requiring activities of the cell such as photosynthesis, protein synthesis and muscle contraction.
Where do the lipids and proteins constituting the cell membrane get synthesised?
Ans : Rough Endoplasmic Reticulum (RER) – synthesizes proteins constituting cell membrane. Smooth Endoplasmic Reticulum (SER) – synthesizes lipids constituting cell membrane.
How does Amoeba obtain its food?
Ans : Amoeba has flexible cell membrane. It enables amoeba to engulf in food by the
process called endocytosis.
What is osmosis?
Ans : The diffusion of water or solvent through a semi-permeable membrane from a
solution of lower concentration of solutes to a solution of higher concentration of
solutes, to which the membrane is relatively impermeable, is called osmosis.
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