Biology

The Fundamental Unit of Life

Question:

Name the longest cell in human body.

Answer:

Human nerve cell about 1 meter long.
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The Fundamental Unit of Life

Q 1.

What are chromosomes?

Q 2.

Why can't single cells grow very large? Or Big organisms like human beings are multi-cellular? Why can't such big organisms be a single large cell?

Q 3.

Name the biggest cell in human body.

Q 4.

Define Exocytosis.

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.

Are plastids present in all cells? What are its types?

Q 7.

What are the functions of Endoplasmic Reticulum (ER)?

Q 8.

What would happen if the plasma membrane ruptures or breaks down?

Q 9.

Who proposed fluid-mosaic model of cell or plasma membrane?

Q 10.

Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?

Q 11.

Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.

Q 12.

Give an example of cells containing two nuclei (Binucleate).

Q 13.

What is plasmolysis?

Q 14.

Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable

Q 15.

Define Cell

Q 16.

Who discovered nucleus in the cell?

Q 17.

Why is mitochondria absent in red blood cells?

Q 18.

Who observed the cells the first time?

Q 19.

Name the smallest cell in human body.

Q 20.

Why are lysosomes known as suicide bags?

Q 21.

Who discovered Virus?

Q 22.

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 23.

Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.

Q 24.

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 25.

Name the book in which Robert Hooke published his observations about cork cells.

Q 26.

Who discovered Golgi apparatus?

Q 27.

Which organelle of the cell in animals helps in osmregulation?

Q 28.

What are the components nucleus?

Q 29.

What is the thickness of cell membrane?

Q 30.

Identify cell organelle and write down its name:
Appear brown dots either present freely in cell or bound to a membrane and make proteins.

Q 31.

Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed

Q 32.

Define Passive Transport.

Q 33.

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 34.

Name the sac like structure which form the grana?

Q 35.

Which organ of the plant body helps in osmoregulation?

Q 36.

Who is known as 'Father of Microscopy'?

Q 37.

What is Endoplasmic Reticulum(ER)? Name its types?

Q 38.

What is the function of nucleoplasm?

Q 39.

Why do we stain cells while observing under microscope? List commonly used stains.

Q 40.

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 41.

Name the world's smallest cell.

Q 42.

Give an example of anucleate cell i.e. cell without nucleus.

Q 43.

Give examples of cells which are muti-nucleate (i.e. having many nuclei).

Q 44.

What is the plasma membrane composed of?

Q 45.

Is plasma membrane permeable or selectively permeable?

Q 46.

Define Osmosis. What are different types of osmosis? Give examples of osmosis.

Q 47.

When chromosomes are visible in the nucleus?

Q 48.

What are centrosomes? What functions do they perform?

Q 49.

Are Viruses Prokaryotic or Eukaryotic?

Q 50.

Which cell organelle is called 'kitchen of plant'?