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.
What is the full form of DNA and RNA?
Q 3.
Which organelle of the cell in animals helps in osmregulation?
Q 4.
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 5.
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 6.
Which cell organelle is called 'kitchen of plant'?
Q 7.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 8.
Name the sac like structure which form the grana?
Q 9.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 10.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 11.
Name the biggest cell in human body.
Q 12.
Give an example of cells containing two nuclei (Binucleate).
Q 13.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 14.
Which cell organelle is known as 'protein factory'?
Q 15.
What are chromosomes?
Q 16.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 17.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 18.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 19.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 20.
Is plasma membrane permeable or selectively permeable?
Q 21.
What are different types transport of components across cell membrane?
Q 22.
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 23.
When chromosomes are visible in the nucleus?
Q 24.
What are centrosomes? What functions do they perform?
Q 25.
What are the functions of Endoplasmic Reticulum (ER)?
Q 26.
What are the components nucleus?
Q 27.
What is the thickness of cell membrane?
Q 28.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 29.
Who observed the cells the first time?
Q 30.
Who proposed the cell theory?
Q 31.
Name the world's smallest cell.
Q 32.
What is the plasma membrane composed of?
Q 33.
Are plastids present in all cells? What are its types?
Q 34.
Will the temperature have any effect on the process of the osmosis?
Q 35.
Which organ of the plant body helps in osmoregulation?
Q 36.
What are the function of nucleus?
Q 37.
In which year electron microscope was invented?
Q 38.
Name the two postulates of the cell theory.
Q 39.
Name the smallest cell in human body.
Q 40.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 41.
What would happen if the plasma membrane ruptures or breaks down?
Q 42.
Who is known as Father of Biology?
Q 43.
Who discovered Golgi apparatus?
Q 44.
Why can't single cells grow very large? Or Big organisms like human beings are multi-cellular? Why can't such big organisms be a single large cell?
Q 45.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 46.
Why is mitochondria absent in red blood cells?
Q 47.
Name the cell organelles which change energy from one form to another.
Q 48.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 49.
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 50.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
