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.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 2.
Name the biggest cell in human body.
Q 3.
What are chromosomes?
Q 4.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 5.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 6.
What are the components nucleus?
Q 7.
Name the cell organelles which their own DNA and Ribosomes.
Q 8.
What is osmoregulation?
Q 9.
When chromosomes are visible in the nucleus?
Q 10.
What is the full form of DNA and RNA?
Q 11.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 12.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 15.
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 16.
Identify cell organelle and write down its name:
Powehouse of cell
Q 17.
Who is known as Father of Biology?
Q 18.
Who discovered Virus?
Q 19.
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 20.
Who coined the term 'protoplasm'?
Q 21.
Name the longest cell in human body.
Q 22.
What are centrosomes? What functions do they perform?
Q 23.
What is the function of nucleoplasm?
Q 24.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 25.
Which organelle of the cell in animals helps in osmregulation?
Q 26.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 27.
Why is mitochondria absent in red blood cells?
Q 28.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 29.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 30.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 31.
What are the function of nucleus?
Q 32.
What is cytoskeleton?
Q 33.
Name the cell organelles which change energy from one form to another.
Q 34.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 35.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 36.
Name the two postulates of the cell theory.
Q 37.
Name the smallest cell in human body.
Q 38.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 39.
Who proposed the cell theory?
Q 40.
Define Passive Transport.
Q 41.
What do you mean by Endocytosis? How does an Amoeba obtain its food?
Q 42.
Which cell organelle is known as 'protein factory'?
Q 43.
Will the temperature have any effect on the process of the osmosis?
Q 44.
Which organ of the plant body helps in osmoregulation?
Q 45.
Are Viruses Prokaryotic or Eukaryotic?
Q 46.
Which cell organelle is called 'transport system'?
Q 47.
Name the largest cell?
Q 48.
Give an example of anucleate cell i.e. cell without nucleus.
Q 49.
Give an example of cells containing two nuclei (Binucleate).
Q 50.
What are different types transport of components across cell membrane?
