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.
What is the full form of DNA and RNA?
Q 2.
Name the sac like structure which form the grana?
Q 3.
Which cell organelle is called 'kitchen of plant'?
Q 4.
What are the function of nucleus?
Q 5.
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 6.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 7.
What is the energy currency of the cell called?
Q 8.
What are the components nucleus?
Q 9.
Name the biggest cell in human body.
Q 10.
Which cell organelle is known as 'protein factory'?
Q 11.
Are plastids present in all cells? What are its types?
Q 12.
Which organelle of the cell in animals helps in osmregulation?
Q 14.
Name the longest cell in human body.
Q 15.
What is the plasma membrane composed of?
Q 16.
Define Passive Transport.
Q 17.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 18.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 19.
When chromosomes are visible in the nucleus?
Q 20.
What are the conditions for osmosis?
Q 21.
Why is mitochondria absent in red blood cells?
Q 22.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 23.
Name the cell organelles which change energy from one form to another.
Q 24.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
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.
Is plasma membrane permeable or selectively permeable?
Q 28.
What is plasmolysis?
Q 29.
What are the functions of Endoplasmic Reticulum (ER)?
Q 30.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 31.
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 32.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 33.
Who observed the cells the first time?
Q 34.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 35.
Who discovered nucleus in the cell?
Q 36.
Name the two postulates of the cell theory.
Q 37.
Who coined the term 'protoplasm'?
Q 38.
Name the largest cell?
Q 39.
Name the smallest cell in human body.
Q 40.
Give an example of anucleate cell i.e. cell without nucleus.
Q 41.
Give an example of cells containing two nuclei (Binucleate).
Q 43.
What would happen if the plasma membrane ruptures or breaks down?
Q 45.
Who is known as Father of Biology?
Q 46.
Which cell organelle is called 'transport system'?
Q 47.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 48.
Name the cell organelles involved in synthesis, packaging and movement of protein (or other macromolecules) inside a cell.
Q 49.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 50.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
