Tag: biology

Questions Related to biology

Keeping is view the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other(flip flop movement).

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. While proteins can flip flop, liquids can not

  2. Neither lipids, nor proteins can flip flop

  3. Both lipids and proteins can flip flop

  4. While lipids can rarely flip flop, proteins can not

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Correct Option: A

Which of the following statement is INCORRECT regarding biological membrane?

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. It is composed of lipids and proteins

  2. Peripheral proteins are loosely associated with the membrane

  3. Integral proteins span the lipid bilayer

  4. Lipids and membrane proteins do not provide structural and functional asymmetry

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Correct Option: D

Cell membrane is not permeable to ___________.

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. CO

  2. Glutamic acid

  3. Both of above

  4. None of these

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Correct Option: A

Lipids are arranged within the membrane with ________.

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. polar heads toward inner side and the hydrophobic tails toward outerside

  2. both heads and tails toward outerside

  3. heads toward outerside and tail towards inside

  4. both heads and tails toward innerside

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Correct Option: C
Explanation:
In lipid bilayer, lipids are arranged with the polar head towards the outer side and the hydrophobic/ non-polar tails towards the inner side.
Therefore the correct option is C. 

The best material for the study of structure of cell membrane is _______.

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. RBC of human

  2. liver cell

  3. kidney cell

  4. muscle cell

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Correct Option: A
Explanation:

RBC (red blood cell) of the human is the best material for the study of structure of cell membrane. Chemical studies on the RBC cell membrane enabled the scientists to infer the possible structure of plasma membrane.

Hence the correct option is A.


The three major components that constitute a typical cell are

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. Plasma membrane, nucleus, organelles

  2. Organelles, nucleus, cytosol

  3. Cytosol, organelles, plasma membrane

  4. Plasma membrane, cytosol, nucleus

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Correct Option: C

The main function of the cell membrane is to:

biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

  1. Provide support

  2. Maintain the cell shape and size

  3. Regulate the flow of materials into and outside the cell

  4. All of the above

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Correct Option: D

Which of the following show higher rate of respiration?

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. Collenchyma

  2. Leaf

  3. Dry seeds

  4. Germinating seeds

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Correct Option: D
Explanation:

An alarmed rate of respiration is seen in germination of seeds. Higher respiration rate is seen in floral vegetative bud, germinating seedlings, young leaves, etc.

Oxygen is necessary for the germination of seeds.

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. True

  2. False

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Correct Option: A

Choose the correct answer from the alternatives given.
With the increase in temperature, the respiratory rate will

biology photosynthesis and respiration experiments on photosynthesis cellular respiration introduction to respiration

  1. decrease slowly

  2. decrease rapidly

  3. increase

  4. remain unaffected

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Correct Option: C
Explanation:

As the temperature increases, the kinetic energy also increases and this increases the rate of reactions. Due to this the rate of cellular respiration also increases. So, the correct option is 'increase'.