Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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.

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


The three major components that constitute a typical cell are

  1. Plasma membrane, nucleus, organelles

  2. Organelles, nucleus, cytosol

  3. Cytosol, organelles, plasma membrane

  4. Plasma membrane, cytosol, nucleus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A typical cell is composed of the plasma membrane (boundary), the cytosol (fluid matrix), and various organelles (functional structures).

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

The main function of the cell membrane is to:

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

The cell membrane acts as a selective barrier that regulates the transport of materials, provides structural integrity, and maintains the internal environment of the cell. All listed functions are primary roles of the plasma membrane.

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

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

  1. decrease slowly

  2. decrease rapidly

  3. increase

  4. remain unaffected
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.