Tag: cell as structural and functional unit

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Multiple choice 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
Robert Hooke actually observed .......... of cells. 

  1. Cell walls.

  2. Protoplasts.

  3. Wall-less cells.

  4. Walled cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Bacteria

  2. Fungi

  3. Virus

  4. Lichens
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice biology cell - the structure and functions cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

Who applied the cell theory to plants?

  1. Schwann

  2. Schleiden

  3. Dutrochet

  4. Virchow
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice biology cell - the structure and functions cell as structural and functional unit introduction to cell discovery and cell theory cell discovery

Who first proposed that new cells are formed by the division of preexisting cells?

  1. Rudolph Virchow

  2. W. Flemming

  3. Karl Nageli

  4. C.P. Swanson
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • By carefully observing the process of cell division, Rudolph Virchow in 1858, argued that cells only arose from the division of pre-existing cells.