Question:
Why are lysosomes known as suicide bags?
Answer:
Lysosomes are organelles that contain digestive enzymes. They digest excess or worn out organelles, food particles, and engulfed viruses or bacteria. Lysosomes fuse with vacuoles and dispense their enzymes into the vacuole, digesting its contents. Sometimes, lysosomes digest the cells that contain them. It happens when cells get damaged or destroyed. That's why lysosomes are called suicidal bags.
E.g. When a tadpole develops into a frog, lysosomes within the cells of the tadpole's tail cause its digestion. Or Lysosomes help in defense by digesting germs, as in white blood cells.
The Fundamental Unit of Life
Q 1.
Which cell organelle is known as 'protein factory'?
Q 2.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 3.
Is plasma membrane permeable or selectively permeable?
Q 4.
Are plastids present in all cells? What are its types?
Q 5.
Which cell organelle is called 'kitchen of plant'?
Q 6.
What is the plasma membrane composed of?
Q 7.
What are chromosomes?
Q 8.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 9.
What is the full form of DNA and RNA?
Q 10.
Why is mitochondria absent in red blood cells?
Q 11.
Name the two postulates of the cell theory.
Q 12.
Name the biggest cell in human body.
Q 13.
Name the sac like structure which form the grana?
Q 15.
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 16.
What are the conditions for osmosis?
Q 17.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 18.
Who observed the cells the first time?
Q 19.
Who coined the term 'protoplasm'?
Q 20.
Name the smallest cell in human body.
Q 21.
Give an example of anucleate cell i.e. cell without nucleus.
Q 22.
What are different types transport of components across cell membrane?
Q 23.
What are the function of nucleus?
Q 24.
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 25.
Who proposed the cell theory?
Q 26.
What is plasmolysis?
Q 27.
Will the temperature have any effect on the process of the osmosis?
Q 28.
Which organ of the plant body helps in osmoregulation?
Q 29.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 31.
When chromosomes are visible in the nucleus?
Q 32.
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 33.
Identify cell organelle and write down its name:
Powehouse of cell
Q 34.
In which year electron microscope was invented?
Q 35.
Which cell organelle is called 'control center'?
Q 36.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 37.
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 38.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
Q 39.
Which cell organelle is called 'transport system'?
Q 40.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 41.
Who is known as 'Father of Microscopy'?
Q 42.
What is the function of nucleoplasm?
Q 43.
What is the thickness of cell membrane?
Q 44.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 45.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 46.
Give an example of cells containing two nuclei (Binucleate).
Q 47.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 48.
Who discovered Golgi apparatus?
Q 49.
What are the components nucleus?
Q 50.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
