Question:
What do you mean by Endocytosis? How does an Amoeba obtain its food?
Answer:
The process by which a cell engulfs material to bring it into the cell is called endocytosis. It is a type of active transport. Endocytosis is of two types:
- Phagocytosis: It refers to the process of engulfing large particles (or cell eating).
- Pinocytosis: it refers to engulfing macromolecules. (or cell drinking)
For example, Amoeba obtains its food by endocytosis in which the flexibility of the cell membrane enables the cell to engulf in food and other material from its external environment.
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.
Name the cell organelles which their own DNA and Ribosomes.
Q 7.
What are the components nucleus?
Q 8.
When chromosomes are visible in the nucleus?
Q 9.
What is osmoregulation?
Q 10.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 11.
What is the full form of DNA and RNA?
Q 12.
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 14.
Who discovered Virus?
Q 15.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 17.
Who is known as Father of Biology?
Q 18.
Identify cell organelle and write down its name:
Powehouse of cell
Q 19.
Who coined the term 'protoplasm'?
Q 20.
What are centrosomes? What functions do they perform?
Q 21.
What is the function of nucleoplasm?
Q 22.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 23.
Why is mitochondria absent in red blood cells?
Q 24.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 25.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 26.
Name the longest cell in human body.
Q 27.
Which organelle of the cell in animals helps in osmregulation?
Q 28.
What are the function of nucleus?
Q 29.
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 30.
Name the smallest cell in human body.
Q 31.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 32.
Will the temperature have any effect on the process of the osmosis?
Q 33.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 34.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 35.
Which cell organelle is known as 'protein factory'?
Q 36.
Are Viruses Prokaryotic or Eukaryotic?
Q 37.
Which cell organelle is called 'transport system'?
Q 38.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 39.
What is cytoskeleton?
Q 40.
Name the cell organelles which change energy from one form to another.
Q 41.
In which year electron microscope was invented?
Q 42.
Name the two postulates of the cell theory.
Q 43.
Name the largest cell?
Q 44.
Is plasma membrane permeable or selectively permeable?
Q 45.
What are different types transport of components across cell membrane?
Q 46.
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 47.
Why are lysosomes known as suicide bags?
Q 48.
Which organ of the plant body helps in osmoregulation?
Q 49.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 50.
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.
