Tag: cell discovery

Questions Related to cell discovery

The size of the cells of an organism has no relation with the size of its body.

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. True

  2. False

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Correct Option: A
Explanation:
  • A cell is the smallest form containing genetic material, cell organelles, cytoplasm and it can replicate to give rise to new cells. The cell size is the same in the elephant and in ant. 

Which of the following is he chief reason to indicate that proto - cell was probably a fermenter?

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. Fermentation provides the most amount of energy

  2. Atmosphere didn't have any oxygen

  3. It didn't have any enzymes

  4. All of the above

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Correct Option: B
Explanation:

The photocell was probably a fermenter living on the preformed organic molecules in the organic soup. The primitive atmosphere was a reducing atmosphere with no free oxygen gas. So, the correct option is "Atmosphere didn't have any oxygen".

Which of the following gives a possible sequence of organic chemicals prior to the proto -cell?

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. Water, salts, protein, oxygen

  2. Inorganic gases, amino acids, polypeptide, microsphere

  3. Inorganic gases, nucleotides, nucleic acids, genes

  4. Both (b) and (c)

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Correct Option: D
Explanation:

The photocell was not considered a cell until it contained the genes. According to the first RNA hypothesis, the first genes and enzymes were RNA molecules. The first protein hypothesis suggested that protein enzymes were needed before nucleic acids could form. So, the correct option is "both (b) and (c)".

Who wrote the book Micrographia, which contains some of the most beautiful drawings of microscopic observations ever made?

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. Anton Van Leeuwenhock

  2. Robert Hooke

  3. Sir Christopher Wren

  4. Ivan Pavlov

Show answer
Correct Option: B
Explanation:

Micrographia: or Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses. With Observations and Inquiries Thereupon. is a historically significant book by Robert Hooke about his observations through various lenses. It is particularly notable for being the first book to illustrate insects, plants etc. as seen through microscopes. Published in January 1665, the first major publication of the Royal Society, it became the first scientific best-seller, inspiring a wide public interest in the new science of microscopy. It is also notable for coining the biological term cell.

So the correct option is 'Robert Hooke'.

Cells are autonomous because___________________

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. They synthesize components of living protoplasm from non-living materials.

  2. They are able to grow and divide.

  3. Each cell has its own life span.

  4. All of the above.

Show answer
Correct Option: D
Explanation:
  • All of the living organisms are made up of cells. Cells can give rise to new cells by cell division. Each cell has a particular life span. Cells possess machinery, enzymes to form living protoplasm from non-living materials. 
  • For example, plant cells take up CO$ _2$ and O$ _2$ from the environment and make food in the presence of sunlight. Animal cells break down or oxidize glucose and form ATP. 
  • Such ATPs are used as energy currency in cell and various processes of cell formation organelle are carried out. Thus, the correct answer is option D.
Robert Hooke actually observed .......... of cells. 
bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

  1. Cell walls.

  2. Protoplasts.

  3. Wall-less cells.

  4. Walled cells.

Show answer
Correct Option: A
Explanation:

Robert Hook discovered cells in 1655 with the help of compound microscope. He was observing insects, sand, bird feathers, fossils and plants. Once he was observing a thin slice of cork under the microscope he found a framework similar to honeycomb-like structure. He named those structures as cells but those were actually non living cell walls. So option A is correct.

Schleiden and Schwann formulated the cell theory.

bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory

  1. True

  2. False

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Correct Option: A

Robert Hook was the first person to see cells in:

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  1. Various ants

  2. Fungi

  3. Animals

  4. Cork

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Correct Option: D
Explanation:

Robert cook first discovered the cells in a cork. He saw small spaces under a microscope and called them cells meaning "little rooms".

So, the correct option is 'cork'.

One of the following is an exception to the 'cell theory'. 

bio-chemistry taxonomy of angiosperms cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

  1. Bacteria

  2. Fungi

  3. Virus

  4. Lichens

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Correct Option: C
Explanation:

  • Schleiden and Schwann in 1839 formulated cell theory. 
  • There are several exceptions to cell theory, e.g., viruses do not have a cellular structure. 
  • They replicate but are non-living particles made up of proteins and nucleic acids. 
  • Only one nucleic acid is found in a virus particle either RNA or DNA.
Thus, the correct answer is option C.

Who applied the cell theory to plants?

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  1. Schwann

  2. Schleiden

  3. Dutrochet

  4. Virchow

Show answer
Correct Option: B
Explanation:

In 1838, German botanist, Matthias Schleiden found that all plant tissues are made up of cells which have been essentially similar structure. German zoologist, Theodor Schwann in 1839 working independently observed that animal cells do not have cell walls but are otherwise similar amongst themselves. He put forward cell hypothesis which states that bodies of animal and plants are made up of cells. Schleiden and Schwann in 1839 compared their findings and formulated cell theory.