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.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 7.
What is the full form of DNA and RNA?
Q 8.
What are chromosomes?
Q 10.
Name the two postulates of the cell theory.
Q 11.
What is the plasma membrane composed of?
Q 12.
Name the sac like structure which form the grana?
Q 13.
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 14.
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 15.
Who observed the cells the first time?
Q 16.
What are different types transport of components across cell membrane?
Q 17.
What are the function of nucleus?
Q 18.
Give an example of anucleate cell i.e. cell without nucleus.
Q 19.
Will the temperature have any effect on the process of the osmosis?
Q 20.
Why is mitochondria absent in red blood cells?
Q 21.
Name the biggest cell in human body.
Q 23.
Name the smallest cell in human body.
Q 24.
What are the conditions for osmosis?
Q 25.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 26.
Who proposed the cell theory?
Q 27.
Who coined the term 'protoplasm'?
Q 28.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 29.
Identify cell organelle and write down its name:
Powehouse of cell
Q 30.
Which organ of the plant body helps in osmoregulation?
Q 31.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 32.
Who is known as 'Father of Microscopy'?
Q 33.
Which cell organelle is called 'control center'?
Q 34.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 35.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 36.
In which year electron microscope was invented?
Q 37.
What is the thickness of cell membrane?
Q 38.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 39.
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 40.
Name the longest cell in human body.
Q 41.
Define Passive Transport.
Q 42.
What is plasmolysis?
Q 43.
Put dried raisins in plain water and leave them for some time. Then place them in concentrated solution of sugar or salt. What do you observe in both cases?
Q 44.
Are Viruses Prokaryotic or Eukaryotic?
Q 45.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
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 is known as Father of Biology?
Q 49.
When chromosomes are visible in the nucleus?
Q 50.
Which cell organelle is called 'transport system'?
