Tag: cell membrane and cell wall

Questions Related to cell membrane and cell wall

Consider the following and choose correct features w.r.t. bacillariophycean members. 
(a) Girdle
(b) Cnidoblast
(c) Sewage pollution indicator
(d) Zygotic meiosis
(e) Auxospores
(f) Diplontic life cycle

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

  1. $\text{a, d, e & f}$

  2. $\text{b, c, d & e}$

  3. $\text{c, d, e & f}$

  4. $\text{c, e & f}$

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Correct Option: A

Robert Hooke discovered the ___ of a cell

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

  1. cell membrane

  2. Nucleus

  3. Cell wall

  4. cytoplasm

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Correct Option: C
Explanation:

Cell wall was discovered by Robert Hooke, in 1665, when he saw an empty box like compartments in a very thin slice of cork under his microscope. He wrote a book Micrographia and coined the term Cellula which was later on changed into cells. Robert Hooke thought cells to be passages for conducting fluids. Actually, he had observed compartments made up of the cell wall and not true living cells.

The cell membrane is selectively permeable, it can be best deduced by?

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

  1. The entry of water

  2. The entry of selective mineral salts

  3. Both A and B

  4. The rise of sap in plants

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Correct Option: A
Explanation:
A selectively permeable membrane will allow free passage of solvent or water molecules, however, the entry of solute particles will be selectively allowed. In other words, not all but selected solute particles will be allowed to pass through.

Which one of the following is wrong statement.

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

  1. Anabaena and Nostoc are capable of fixing nitrogen- in

    free living state also

  2. Root nodule forming nitrogen fixers live as aerobes

  3. Phosphours is a constituent of all members ,certain

    nucleic acids and all proteins

  4. Nitrosomonas and Nitrobacter are chemoautotrophs

Show answer
Correct Option: B
Explanation:
Anabaena and Nostoc are also free-living nitrogen fixers.
Root nodule forming nitrogen fixers enzyme (nitrogenase) works only under the anaerobic condition.
Phosphorus is a constituent of cell membranes as a phospholipid, in nucleic acid as phosphate group and proteins are rich in phosphorus.
Nitrosomonas and Nitrobacter play an important role in nitrification. They are chemoautotrophs.
So the correct answer is 'Root nodule forming nitrogen fixers live as aerobes under free-living conditions'

Which one occurs in both prokaryotic and plant cells?

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

  1. Nucleus

  2. Chloroplast

  3. Cell wall

  4. Mitochondria.

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Correct Option: C

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.