Tag: cell wall

Quizzes (3) Questions (22)

Questions Related to cell wall

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

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

  1. $\text{a, d, e & f}$
  2. $\text{b, c, d & e}$
  3. $\text{c, d, e & f}$
  4. $\text{c, e & f}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacillariophyceae (diatoms) are characterized by features like auxospores, zygotic meiosis, and a diplontic life cycle. Girdle refers to their frustule structure.

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

Robert Hooke discovered the ___ of a cell

  1. cell membrane

  2. Nucleus

  3. Cell wall

  4. cytoplasm
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. The entry of water

  2. The entry of selective mineral salts

  3. Both A and B

  4. The rise of sap in plants
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

Which one of the following is wrong statement.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

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).

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the fluid mosaic model of the cell membrane, lipids can rapidly diffuse laterally and occasionally flip flop from one monolayer to the other, though this transverse movement is very rare without the help of enzymes like flippases. Integral membrane proteins, on the other hand, never undergo flip flop movement due to the thermodynamic barrier of hydrophilic regions passing through the hydrophobic core.

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

Which of the following statement is INCORRECT regarding biological membrane?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biological membranes are highly asymmetric in both lipid composition and protein distribution, which is essential for their functional diversity.

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

Cell membrane is not permeable to ___________.

  1. CO

  2. Glutamic acid

  3. Both of above

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The lipid bilayer of a cell membrane is hydrophobic in its interior, allowing small uncharged molecules like gases (CO) to pass freely. Large polar molecules and charged amino acids, such as glutamic acid, cannot easily cross the lipid bilayer without specific transport proteins.

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

Lipids are arranged within the membrane with ________.

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 
Multiple choice biology cell and cell organelles cell membrane and cell wall cell wall cell division in embryo development

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

  1. RBC of human

  2. liver cell

  3. kidney cell

  4. muscle cell
Reveal answer Fill a bubble to check yourself
A Correct answer
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.