Tag: cell as structural and functional unit

Questions Related to cell as structural and functional unit

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

Show answer
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.'

Simple one-celled cyanobacteria-like organisms developed on earth.

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. $5600$ million years

  2. $5000$ million years

  3. $4600$ million years

  4. $3600$ million years

  5. $3000$ million years

Show answer
Correct Option: A

The 'cell doctrine' was given by____________.

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. Robert Hooke

  2. Schwann, Schleiden and Virchow

  3. Dutrochet

  4. Huxley

Show answer
Correct Option: B
Explanation:

Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. Cell theory was considered as the most acceptable theory which, elucidated the functioning of a cell. The cell theory includes the following points -
1) All living things are made up of cells.
2) The cell is the smallest living thing that can perform all the functions of life.   
Later on, in the year 1855, Rudolf Virchow added a new point in cell theory that all cells must come from pre-existing cells, which was also known as "Omnis cellula e cellula". The modern cell theory is called as 'Cell Principle' or 'Cell Doctrine'.
So, the correct answer is option B.

Who reported that entity of an organism is not because of the cell but collection of many cells?  

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. Dutrochet

  2. Dujardin

  3. Robert Brown

  4. Schleiden and Schwann

Show answer
Correct Option: A
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 A.

The ratio of inorganic matter to organic matter in the cell 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. Variable

  2. 1:9

  3. 9:1

  4. 10:5

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Correct Option: B