Tag: biology

Questions Related to biology

In a hypotonic solution, the cell 

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Shrinks

  2. Remains of the same size

  3. Swells

  4. All of the above

Show answer
Correct Option: C
Explanation:

Hypotonic solution is a type of solution in which water concentration in the medium is more than the cell. Water crosses the membrane in both directions, but more water will come into the cell than will leave. The net result is that the water enters the cell. The cells will swell up. 

Solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell is a 

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Hypertonic solution

  2. Isotonic solution

  3. Hypotonic solution

  4. Both A and C

Show answer
Correct Option: A
Explanation:

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. Therefore, the cell will shrink due to exosmosis.

If a cell is in a hypotonic environment, this means

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. There are fewer solutes inside the cell than in the extra-cellular environment

  2. There is an equal amount of solutes inside as outside the cell

  3. There is more solute outside the cell than in the cell

  4. There is less solute outside the cell than inside of the cell

Show answer
Correct Option: D
Explanation:

A hypotonic environment is when the solute concentration outside the cell is less than inside the cell.

When both the regions have the same solute concentration it is an isotonic environment.
When the solute concentration outside the cell is higher than inside the cell then it is in a hypertonic environment.
So the correct answer is 'There is less solute outside the cell than inside the cell'.

Roots will absorb water when external medium will be

biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Concentrated

Show answer
Correct Option: A
Explanation:

Osmosis happens along a concentration gradient. If outside medium is hypotonic, it means that relatively more of water is present outside the cells in the surrounding medium and water will flow inside the root hair cells.

The structure that are involved in the manufacture and supply of energy to the cell are:

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. Centroies

  2. Nucleoius

  3. Pestide

  4. Mitochondria

Show answer
Correct Option: D
Explanation:

Mitochondria is responsible for manufacturing and supplying chemical energy by releasing energy stored in food molecules and synthesising ATP. It is called the power house of the cell. 

So, the correct option is 'Mitochondria'.

Which of the following cells kill virus infected cells ?

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. NK cells

  2. $T _K$ cells

  3. B - lymphocytes

  4. Both (1) and (2)

Show answer
Correct Option: A

$\beta$-TGF promotes and is useful in

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. new Angiogenesis

  2. Epidermal growth

  3. wound healing and burns

  4. all of these

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Correct Option: A

The function of bulliform cells is to.

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. These are present in some desertic grasses

  2. These are large and empty

  3. Reduce the rate of transpiration

  4. Perform nitrogen fixation

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Correct Option: A

Assume a spherical mammalian cell has diameter of 27 $\mu m$, If a polypeptide chain with alpha helical canfoemation has to stretch across the cell, how many amino acids should it comprise of: 

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. 18000

  2. 27000

  3. 1800

  4. 12000

Show answer
Correct Option: A
Explanation:

No. of amino acid in one term in α helix = 3.6

Pitch length for α Helix = 5.4 Aº  
The No. of Amino acid in polypeptide
= 1.8 x $10^4$ Amino acid = 18000 amino acid
Thus A is the correct answer.

Branched sclerenchyma occurring as isolated cells scattered in any tissue are called.

biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

  1. Libriform fibers

  2. Tracheidal cells

  3. Idioblasts

  4. Stone cells

Show answer
Correct Option: A