Question:
What would happen if the plasma membrane ruptures or breaks down?
Answer:
Plasma or Cell membrane is a selectively permeable membrane i.e. it allows movement of certain materials in and out to the cell. In case plasma membrane ruptures (like in hypertonic solution), the cell will shrivel and eventually die. At this time, lysosomes of the cell will come into action. Lysosomes will release digestive enzymes and eat up worn out cell organelles and foreign material.
The Fundamental Unit of Life
Q 1.
Identify cell organelle and write down its name:
A network of flattened cavities surrounded by a membrane, which links with the nuclear membrane. Help in packaging proteins.
Q 2.
Name the two postulates of the cell theory.
Q 3.
What is the plasma membrane composed of?
Q 4.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 6.
What is the full form of DNA and RNA?
Q 7.
Name the cell organelles which change energy from one form to another.
Q 8.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 9.
Identify cell organelle and write down its name:
Slipper or oval shaped, its inner membrane is multi-folded and has lot of chemical activity
Q 10.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 11.
Are plastids present in all cells? What are its types?
Q 12.
Is plasma membrane permeable or selectively permeable?
Q 13.
What are chromosomes?
Q 14.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 15.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 16.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 17.
Which cell organelle is called 'kitchen of plant'?
Q 18.
What is the thickness of cell membrane?
Q 19.
Name the biggest cell in human body.
Q 20.
Place a de-shelled egg in water for five minutes. What do you observe? (Note: De-shelled egg means,the shell of an egg is removed by dissolving it in dilute hydrochloric acid. The shell is mostly calcium carbonate. A thin outer skin now encloses the egg.)
Q 21.
Which cell organelle is known as 'protein factory'?
Q 22.
Name the sac like structure which form the grana?
Q 23.
Will the temperature have any effect on the process of the osmosis?
Q 24.
What is cytoskeleton?
Q 25.
Identify cell organelle and write down its name:
Thread like structures made up of in DNA and proteins. Converts to chromosomes when cell is dividing.
Q 26.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 27.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 28.
In which year electron microscope was invented?
Q 29.
Who coined the term 'protoplasm'?
Q 30.
Which organelle of the cell in animals helps in osmregulation?
Q 31.
Identify cell organelle and write down its name:
Powehouse of cell
Q 32.
Who observed the cells the first time?
Q 33.
Define Passive Transport.
Q 34.
What is the energy currency of the cell called?
Q 35.
Which organ of the plant body helps in osmoregulation?
Q 36.
What are the functions of Endoplasmic Reticulum (ER)?
Q 37.
Why is mitochondria absent in red blood cells?
Q 38.
Identify cell organelle and write down its name:
A partially permeable layer prevents cell contents from escaping controls what substances enter and leave the cell. Identify?
Q 39.
Name the smallest cell in human body.
Q 40.
Name the cell in human body which cannot reproduce.
Q 41.
Give an example of cells containing two nuclei (Binucleate).
Q 42.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 43.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 44.
What would happen if the plasma membrane ruptures or breaks down?
Q 45.
What are centrosomes? What functions do they perform?
Q 46.
Which cell organelle is called 'transport system'?
Q 47.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 48.
Identify cell organelle and write down its name:
Membrane-bound vesicles arranged approximately parallel to each other. Active in synthesis, modification, sorting, and Secretion of cell products
Q 49.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 50.
Name the largest cell?
