Cell Membrane
Trending Questions
Why is the plasma membrane called a selectively permeable membrane
What is the main function of plasma membrane ?
What happens if the plasma membrane ruptures or break down?
What would happen if the plasma membrane ruptures or breaks down?
Question 9 (i)
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) Keep cup A empty
(b) Put one teaspoon of sugar in cup B
(c) Put one teaspoon of salt in cup C
(d) Put one teaspoon of sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
List any six features found both in plant and animal cells.
Is there any difference between semi permeability and selectively permeability?
What are 2 functions of cell membrane?
Describe with a diagram the fluid mosaic organisation of hte plasma membrane.
What is meant by selectively permeable membrane ?
What is an example of osmosis in the human body?
Why are cells small
Why is endocytosis found in animals only?
State the major functions of the following :
(a) Plasma membrane
(b) Ribosome
(c) Lysosome
(d) Mitochondria
(e) Golgi apparatus
(f) Cytoplasm
(g) Asters of centrosome
(h) Chromosomes
(i) Glycogen granule
(j) Vacuoles
- It acts as a channel for the transport of substances within the cell.
- It gets modified to perform absorption in microvilli.
- It protects the cell from its surroundings.
- It provides a definite shape to the cell.
Do animal cells have a cell wall?
Select the odd one out?
The movement of water across a semi-permeable membrane is affected by the number of substances dissolved in it.
Membranes are made of organic molecules like proteins and lipids
Molecules soluble in organic solvents can easily pass through the membrane.
Plasma membranes contain chitin sugar in plants
- Provide mechanical strength
- Protect cells against pathogens and mechanical injury
- Permit cells to survive in very dilute external medium
- Help in transportation and communication between cells
The osmotic pressure of a solution can be increased by :
Increasing the number of solutes
Increasing the volume
Removing semipermeable membrane
Decreasing the temperature
What is the difference between semi permeable and selectively permeable?
Which one of the following is not a constituent of the cell membrane?
Cholesterol
Glycolipids
Phospholipid
Prolin
Explain cyclosis and in which organism it is absent.
Plasmolysis occurs due to:-
Absorption
Endosmosis
Diffusion
Exosmosis
- Cell shrinks.
- Cell becomes swollen and lysed.
- Remains unchanged.
- The cell becomes swollen but not lysed.
- cell wall
- cell membrane
- shell
- cytoplasm
State an example to show plasma membrane is flexible in nature.
Is osmosis movement of water from higher concentration to lower concentration or vise-vesa?