Tag: cell discovery

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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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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".

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

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

  1. Water, salts, protein, oxygen

  2. Inorganic gases, amino acids, polypeptide, microsphere

  3. Inorganic gases, nucleotides, nucleic acids, genes

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
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)".

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

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

  1. Anton Van Leeuwenhock

  2. Robert Hooke

  3. Sir Christopher Wren

  4. Ivan Pavlov
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Cells are autonomous because___________________

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
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.