Tag: cell : the basis of life

Questions Related to cell : the basis of life

Cells were found to develop from pre-existing cells by

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Lamarck

  2. Schleiden and Schwann

  3. Virchow

  4. Leeuwenhoek

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Correct Option: C

Who initiated cell concept?

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Robert Hooke

  2. Leeuwenhoek

  3. Grew

  4. Schleiden and Sohwann

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Correct Option: C
Explanation:

Nehmiah Grew initiate cell concept when he found that plant tissues contain minute elementary structures or cells. Thus, it was a 'basic generalization' extended to all the plants by Schleiden. Schleiden by himself neither discovered cell nor described their structure but extended the cell concept to all plants.

Therefore C is the correct option. 

"Omnis cellula e cellula" is a generalization, given by

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Lamarck.

  2. Dutrochet.

  3. Leeuwenhoek.

  4. Virchow.

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Correct Option: D
Explanation:

Rudolf Virchow explained that cells divided and new cells are formed from pre-existing cells. "Omnis cellula e cellula" is also attributed to the Cell Theory, that works on a similar principle. The cell theory asserts that every organism is formed of the same units of the organisation, known as cells.

So, D is the correct option.

An individual has a number of different type of cells was first stated by ______________.

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Dujardin.

  2. Robert Brown.

  3. Dutrochet.

  4. Schleiden and Schwann.

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Correct Option: C
Explanation:

Leeuwenhoek was the first to see 'free-living cells' under his microscope. In 1809, Lamarck concluded that all living beings are formed of cells. Living substance was first observed by Corti in 1772 and was named sarcode by Dujardin in 1835. Dutrochet believed in the individuality of cells, i.e., living organisms are made up of a number of individual cells. The nucleus was discovered by Robert Brown and Schleiden and Schwann are credited with the formulation of the cell theory. 

Thus, the correct answer is option C.

Cell theory was propounded by

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. A botonist.

  2. A zoologist.

  3. Both a botanist and a zoologist.

  4. A psychlologist.

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Correct Option: C

New cells generate from

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Bacterial fermentation.

  2. Regeneration of old cells.

  3. Pre-existing cells.

  4. Abiotic material.

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Correct Option: C
Explanation:
New cells generate from pre-existing cells. Rudolf Virchow (1985) first explained that cells divide and new cells are formed from pre-existing cells (omnis cellula-e cellula). He modified the hypothesis of Schleiden and Schwann to give cell theory a final shape.
Cell theory now is understood as:
All living organisms are composed of cells and the product of cells.
All cells arise from pre-existing cells.

New cells generate from :

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Bacterial fermentation

  2. Regeneration of old cells

  3. Pre-existing cells

  4. Abiotic materials

Show answer
Correct Option: C
Explanation:

New cells generate from pre-existing cells. Rudolf Virchow (1985) first explained that cells divide and new cells are formed from pre-existing cells (omnis cellula-e cellula). He modified the hypothesis of Schleiden and Schwann to give cell theory a final shape.
Cell theory now is understood as:

  1. All living organisms are composed of cells and the product of cells.
  2. All cells arise from pre-existing cells.

    Choose the correct answer from the alternatives given.


    Which is not true about the cell theory?

    biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

    1. It states that all organisms are composed of cells

    2. It states that all cells come from pre-existing cells

    3. It states that bacteria and other small organisms can arise spontaneously

    4. It is accepted today by biologists as applying to virtually all forms of life

    Show answer
    Correct Option: C
    Explanation:

    According to the cell theory all organisms (unicellular or multicellular) are formed of cells. It also states that all cells arise from pre-existing cells by cell division and do not originate spontaneously. Bacteria and other organisms therefore cannot arise spontaneously. So, the correct answer is 'It states that bacteria and other small organisms can arise spontaneously'.

    State the following statements are true or false.

    New cells originate from the division of pre-existing cells. 

    biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

    1. True

    2. False

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    Correct Option: A
    Explanation:

    • Reproduction is based on the phenomenon that new cells arise from preexisting cells. 
    • Spontaneous generation is not possible.
    This is one of the postulates of the cell theory.
    So, the correct statement is 'New cells originate from the division of pre-existing cells'.

    Choose the correct answers from the alternatives given .
    Evolution of the DNA $\rightarrow$ RNA $\rightarrow$ protein system was a milestone because the protocell could now

    biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

    1. be a heterotrophic fermenter

    2. passon genetic information

    3. use energy to grow

    4. take in preformed molecules

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    Correct Option: B