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

One millionth of a metre is

  1. Millimetre

  2. Micrometre

  3. Nanometre

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

A micrometre is also known as a micron. It is an SI derived unit of length. Its value is 1×10$^{−6}$ metres or one millionth of a metre. Thus the correct answer is option B.

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

Mark the correct option

  1. Every living organism is made up of cells and organs

  2. Living organisms have capacity to divide

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Living organisations have capacity to reproduce for ex animals give both to young ones of their kind, either directly or through egg.

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 discovered Endoplasmic reticulum?

  1. Porter

  2. Altmann

  3. Golgi

  4. Benda
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Endoplasmic reticulum (ER) is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes. 
  • Endoplasmic reticulum was discovered by Porter and Thompson (1945). 
  • The name endoplasmic reticulum was given by Porter in 1953.
    Hence, option A is correct.
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

"Lysosomes" were discovered by

  1. Haekel

  2. Christian de Duve

  3. Hugo de Vries

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

Lysosomes are small vesicles containing hydrolyzing enzymes and surrounded by a single membrane of lipids. They were discovered by Christian de Duve in 1955 but were named and observed under an electron microscope by Novikoff in 1956. 

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

___________ are the non-living components of the cell.

  1. Lysosomes

  2. Vacuoles

  3. Nuclei

  4. Golgi bodies
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Cell inclusions are tiny droplets which contain stored nutrients, secretory products and pigment granules.
Eg- lipid droplets in fat cells, pigment granules in skin cells and hair cells, water-containing vacuoles.
Vacuoles are non-living cell inclusions present in the cytoplasm which contain inorganic and organic molecules.Each droplet is a small vacuole filled up with cell-sap. These small vacuoles enlarge and finally coalesce to give rise to a large vacuole.They are present in the form of minute droplets in the cytoplasm of the cells (small vacuole filled with cell sap).
So, the correct answer is 'Vacuoles'.
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

An exception to cell theory is 

  1. Fungi

  2. Bryophyte

  3. Virus

  4. Pteridophyte
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Virus are an exception to cell theory. Because of the following reasons
1. The viruses are non-cellular organism that are characterized by having an inert crystalline structure outside the cell. 
2. Once they infect a cell they take over the machinery of the host cell to replicate themselves, killing the host.
So, the correct answer is 'Virus'.
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 phrase omnis cellula e cellula was given by

  1. Virchow

  2. Pasteur

  3. Schleiden and Schwann

  4. Robert Brown
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pasteur work on fermentation and germ theory of biology. Schleiden and Schwann are the co-founders of cell theory. Robert Brown was a Botanist and he discovered the nucleus. Rudolf Virchow was a German Physician, Biologist, Pathologist as well as a writer. The phrase 'Omnis cellula e cellula' is coined by Virchow which means all cells come from a cell, all cells born from a previous cell. So the answer is 'Virchow'.

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

Cell principle is not applicable to

  1. Bacteria.

  2. Viruses.

  3. Algae.

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

Cell principle states that the cell is a fundamental unit of life and has all structural and functional properties of an organism. Also according to this principle cells are made from pre-existing cells and all organisms are made up of cells. Bacteria, algae and fungi obey the cell principle rules whereas viruses are under debate of being living or dead. They have many features of life but according to cell theory, they are not alive. Viruses lack cellular structure (cell wall, cytoplasm, ribosomes etc.) but do have genetic material in the form of RNA and they can only multiply when inside a host cell. Outside a host, they are unable to survive. Since a virus is not a cell, cell principle is not applicable to them. 

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

Cell is a unit of

  1. Structure.

  2. Function.

  3. Mass of protoplasm.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A cell is a unit mass of protoplasm which is surrounded by protective and semi-permeable plasma membrane which separates the cell contents from the environment. 
  • It is the basic unit of life and carries out the different functions of life. The body of all organisms is made up of cells so it is the structural unit of life. 
  • Also, all the physiological, biochemical and genetic functions of the body are carried out by cells so it is called a functional unit of life. So, 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

'Micrographia' was written by which of the following scientists?

  1. Grew

  2. Hooke

  3. Brown

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

Micrographia is a book written by Robert Hooke when he discovered the cells in 1665. His all observation about the discovery of cells is detailed in this book. Hans and Zacharias designed the first compound microscope and by using this microscope Robert Hooke studied insects, sand, bird feathers, snowflakes and plants. He also observed a piece of cork which made him discover a framework of cells with empty spaces within it. its visual similarity with honeycomb cells made him name those units as the cell. He recorded all such observation through different lenses in the book Micrographia which is the first scientific bestseller.