Tag: cell-the basic unit of life

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Questions Related to cell-the basic unit of life

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 statements is true?

  1. The structural unit of living things is molecule.

  2. All animals are autotrophs.

  3. All organisms reproduce sexually.

  4. Organisms follow a life cycle of birth, growth, reproduction, ageing and death.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • All the living organism is made up of cells which constitute some organic and inorganic molecules and perform all the life process like nutrition (autotrophic or heterotrophic), reproduction (sexual or asexual), excretion. 
  • Each cell arises from pre-existing cells, they divide and increase their numbers and has a certain life span, thus they undergo aging and then death. 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

Each cell of unicelluler organism performs certain functions such as____________

  1. Nutrition

  2. Transport

  3. Excretion and reproduction

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • In unicellular (single-celled) organisms, the single cell performs all life processes for survival such as nutrition, transport, excretion, and reproduction. 
  • They do not depend on another cell for function and thus exist independently.
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

Each cell is amazing world in itself because 

  1. It can take in nutrients, converts these nutrients into energy.

  2. It carry out specialized functions.

  3. It can reproduce as necessary.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Cells are called an amazing world in itself because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. 
  • These have the specialized enzymes, which catalyze the biochemical reaction and regulates the specialized functions of the body such as the conversion of nutrients into the energy, reproduction in unicellular and division or replication in multicellular.
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

Which scientist coined the term cell?

  1. Robert hooke

  2. Robert brown

  3. Robert clay

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

Robert Hooke was an English scientist who coined the term cell for the Honeycomb structures he saw in a cork slice. Through he didn't see the inside of a cell, he discovered the cell and coined the term. He used a primitive compound microscope . He only saw cell walls as it a dead tissue. He discovered it in $1665$. The first man to witness a live cell under microscope was Antonie Philips van Leeuwenhoek in $1674$.

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'.