Question:
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Answer:
Yes there are exceptions to cell theory. These are:
- Cell theory do not explain nature of Virus. They become live and multiply though they are made up of non-living material.
- How come the first living cell originated or how life began on the earth. (Scientists J.B.S. Haldane, Stanley L. Miller and Harold C. Urey did experiments to on this.).
- Mitochondria and chloroplasts have their own genetic material and can reproduce independently.
The Fundamental Unit of Life
Q 1.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 2.
What are chromosomes?
Q 3.
Name the biggest cell in human body.
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.
Who coined the term 'protoplasm'?
Q 17.
Who is known as Father of Biology?
Q 18.
What are centrosomes? What functions do they perform?
Q 19.
What is the function of nucleoplasm?
Q 20.
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 21.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 22.
Who discovered Virus?
Q 23.
Identify cell organelle and write down its name:
Powehouse of cell
Q 24.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 25.
Name the smallest cell in human body.
Q 26.
Name the longest cell in human body.
Q 27.
Which organelle of the cell in animals helps in osmregulation?
Q 28.
Name the cell organelles which change energy from one form to another.
Q 29.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 30.
What are the function of nucleus?
Q 31.
Why is mitochondria absent in red blood cells?
Q 32.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 33.
Who proposed the cell theory?
Q 34.
Name the two postulates of the cell theory.
Q 35.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 36.
Will the temperature have any effect on the process of the osmosis?
Q 37.
Which organ of the plant body helps in osmoregulation?
Q 38.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 39.
What are different types transport of components across cell membrane?
Q 40.
Define Passive Transport.
Q 41.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 42.
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 43.
Which cell organelle is known as 'protein factory'?
Q 44.
What is the energy currency of the cell called?
Q 45.
What are the conditions for osmosis?
Q 46.
Are Viruses Prokaryotic or Eukaryotic?
Q 47.
Which cell organelle is called 'transport system'?
Q 48.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 49.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
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.
