Tag: cell-the basic unit of life

Questions Related to cell-the basic unit of life

Which of the following is not a cell?

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

  1. Red Blood Corpuscle (RBC)

  2. Bacterium

  3. Spermatozoa

  4. Virus

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Correct Option: D
Explanation:
  • Virus is an acellular microscopic infection-causing agent. It has only protein cover and a nucleic acid (either DNA or RNA). These are intracellular parasites that depend upon the host for nutrition.

The ______ is the basic structural and functional unit of life.

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

  1. Tissue

  2. Organ

  3. Cell

  4. Organelle

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Correct Option: C
Explanation:

The cell is the basic structural and functional unit of life. Whether it is a complex organism like humans, animals or plants or simple organisms like the bacteria, they are all made of cells. So, the cell forms the most basic level of organization of organisms.

The shape of the cell is related to

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

  1. the habitat of the organism

  2. the body size of the organism

  3. the function it performs

  4. the number of cells in an organism

Show answer
Correct Option: C
Explanation:

There is a direct correlation between the shape of the cell and the function it performs. For example, the Red Blood Cells (RBCs) have a biconcave disc-shaped structure because they have to squeeze through blood capillaries to deliver oxygen to the various parts of the body. If the RBCs had any other shape, it would be difficult to perform the same function efficiently.

Cells were determined to be the basic structural units of plants and animals, in which of the following time period?

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

  1. 1600's

  2. 1700's

  3. 1800's

  4. 1900's

Show answer
Correct Option: C
Explanation:

  • The cell was discovered by Robert Hook in 1665. But the statement that cell is the structural and functional unit of life generalized as cell theory in 1839 by Schleiden and Schwann. Thus, the correct answer is option C.

1 A$^o$ is

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

  1. 10$^{-6}$m

  2. 10$^{-9}$m

  3. 10$^{-10}$m

  4. 10$^{-3}$m

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Correct Option: C
Explanation:

(a) 1 Micrometer= 10$^{-6}$m
(b) 1 Nanometer= 10$^{-9}$m
(c) 1 Angstrom= 10$^{-10}$m

THus, the correct answer is option C.

Auxospores are formed in the life cycle of diatoms these structure are ________________.

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

  1. Vegetuative cells with ploidy level N

  2. Asexual spores with ploidy level N

  3. Statosspores with 2N ploidy Level

  4. Sexual spores with ploidy level $2N$

Show answer
Correct Option: A
Explanation:
Auxospores are formed by diatoms at an important stage of their life cycle. They are specialized cells which help the diatoms in regaining their normal size. After cell division in diatoms, each daughter cell inherits one of the two valves and hence results in reduction of size of the diatom, to retain the size diatoms produce auxospores and hence they are vegetative.
So, the correct option is, 'Vegetuative cells with ploidy level N'.

Which one of the following is incorrect for the members of chrysophyta?

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

  1. These are nonmotile bivalved organism

  2. Presence of primordial utricle around a central vacuole

  3. Resetve food materials are paramylon and volutin granules

  4. Movement occurs by mucilage propulsion

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Correct Option: A
Explanation:

Chrysophyta are motile. They sometime produce flagellated motile zoospores during reproduction. They are also bivalved.

Therefore the right answer is "These are nonmotile bivalved organism".

The concept ''OMNIS cellula-e-cellala'' means that ,new cells are formed from:

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

  1. Non living materails

  2. Pre-existing living cells

  3. Dead organic matter

  4. As the results of chemical reaction

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Correct Option: B
Explanation:

"Omnis cellula e- cellula" means new cells are formed from pre-existing living cells. 

So the correct option is 'pre existing living cells'.

Which of the following statement is false?

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

  1. Properties of cellular organelles are present in the molecular constituents of the organelles

  2. Interaction among the molecular components of the organelles results into properties of cell organelles

  3. Biology is the story of life on earth(formation, evolution and biodiversity)

  4. Biology is the life sciences dealing with every aspect of life

Show answer
Correct Option: A
Explanation:

A cell possesses several cellular organelles. Each of the organelle such as mitochondria, endoplasmic reticulum etc. have their own specific function in the cell. These organelles are composed of several molecules and ions such as proteins, lipids, calcium and magnesium ions etc. These molecules together help the organelles perform their specific function. However, when present outside the organelle or in a different organelle the same molecules may perform functions that are different. So, the correct option is 'Properties of cellular organelles are present in the molecular constituents of the organelles'.

The size of the cell is not related to the size of the body of an animal.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
The size of cell of an organism has no relation with the size of its body. The size of the cell does not matter. It is always the number of cells. If the organism is unicellular, it is very microscopic. If it is multicellular, as the cell number increases, the size of the organism will also increase. 
Thus, the correct answer is 'True.'