Quiz 6. Cell - Basic Unit Of Life

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It includes Cell Membrane of Eukaryotic cells

Name *

1 point

Plasma membrane "Fluid Mosaic Model" was proposed by *

1 point

Watson and Crick

Darwin

Singer and Nicolson

Anton von Leeuwenhoek

The lipids are arranged within the membrane with the orientation of .....
*

1 point

Polar head towards inner side, Hydrophobic tail towards outside

Non-Polar head towards inner side, Hydrophobic tail towards outside

Polar head towards outer side, Hydrophobic tail towards inner side

Non-Polar head towards inner side, Hydrophilic tail towards outside

In human beings, the membrane of the erythrocyte has approximately ....... protein and ....... lipids.
*

1 point

40 % and 60%

60% and 40%

52% and 40%

40% and 52%

Cell membrane is mainly composed of
*

1 point

Carbohydrates and lipids

Lipids and proteins

Prteins and carbohydrates

Carbohydrates and cholesterol

Major component of membrane is ....... which is arranged as a bilayer *

1 point

Protein

Lipids

Carbohydrates

Lipid and proteins both

Select incorrect statement regarding plasma membrane *

1 point

In addition to phospholipids membrane also contains cholesterol.

Quasi-fluid nature of lipid enables lateral movement of proteins within the bilayer

Peripheral proteins lie on the surface of membrane

Lipids are arranged in bilayer with head towards inner side

Electron Microscope was advent in the years *

1 point

1930s

1940s

1950s

1960s

Plasma membrane mainly consist of *

1 point

Phospholipids embedded in proteins bilayer

Proteins embedded in phospholipids bilayer

Lipids embedded in carbohydrates bilayer

Proteins embedded in carbohydrates bilayer

Heads and tails of phospholipids are *

1 point

Head is non polar, tail is hydrophilic

Head is non polar, tail is hydrophobic

Head is polar, tail is hydrophilic

Head is polar, tail is hydrophobic

Select incorrect regarding to tail of phospholipid of membrane *

1 point

It is hydrophobic

It is made of saturated hydrocarbon

It is non polar

It is protected from the aqueous environment

All are correct

Which of the following is largest constituent of cell membrane in human erythrocyte *

1 point

Lipids

Phospholipid

Proteins

Carbohydrates

Which one is wrong about membrane ? *

1 point

Proteins are more than lipids in human RBC

The carbohydrates are more than protein

Movement of water by diffusion is called osmosis

Neutral solutes may move across the membrane by simple diffusion

The most important function of cell membrane is *

1 point

Growth

Endocytosis

Transport of molecule across it

Cell division

.......... molecules cannot pass through the .......... lipid bilayer, they require a carrier protein of the membrane to facilitate their transport across the membrane.
*

1 point

Non polar, Hydrophilic

Polar, polar

Polar, non polar

Non polar both

The movement of molecules across membrane with and without requirement of energy *

1 point

Passive and active transport

Active and passive transport

Passive both

Active both

Movement of water across membrane is from *

1 point

Higher concentration to lower concentration of water

Lower concentration to higher concentration of water

Outside to inside of cell

Inside to outside cell

Movement of sodium and potassium across membrane is example of *

1 point

a. Active transport

b. Transport against concentration gradient

c. Passive transport

d. Both a and b

In which of the following process movements of substance takes place along concentration gradient ? *

1 point

Diffusion

Osmosis

Passive transport

All of the above

Which type of substance face difficulty in passing through cell membrane ? *

1 point

Hydrophilic moiety

Hydrophobic moiety

Substance which are soluble in lipid

Irrespective of hydrophilic and hydrophobic moiety

Which one is correct for transport proteins in lipid bilayer of plasma membrane ? *

1 point

They are absent in animal cell

They act as channel proteins

They are absent in plant cell

They are only externally located

Detailed structure of plasma membrane was studied only after the advent of *

1 point

Electrone microscope

Compound microscope

X Ray crystallography

X Ray diffraction

Integral and peripheral protein classified on the base of *

1 point

Protein size

Ease of extraction

Ease of study

Ease of function

Lateral movement of which biomolecules takes place within bilayer *

1 point

Lipids

Protein

Carbohydartes

Both a and b

The ability to move within the membrane is measured as its *

1 point

Liquidity

Fluidity

Solubility

Stability

Fluid nature of membrane is also important from point of view of functions like
*

1 point

Growth

Secretion

Cell division

All of the above

Fluidity of membrane is measured *

1 point

The amount of protein and cholesterol in membrane

Lateral movement of protein in lipid bilayer

Amount of carbohydrates

Amount of cholesterol

Select the wrong statement regarding Na+/ K+ Pump *

1 point

It is active process

ATP is not utilised

It is energy dependant process

All are wrong statement

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