Cell membrane

Question 1

A generalized animal cells diameter

Answer 1

20μm

Question 2

CELL SURFACE MEMBRANE diameter

Answer 2

7nm

Question 3

Cell membrane is which membrane and allow exchange of

Answer 3

semipermeable membrane and allows exchange of certain biological molecule and ions.

Question 4

CELL MEMBRANE

Answer 4

1). is extremely thin with trilaminar ((Using the transmission electron microscope (TEM), the plasma membrane has a trilaminar appearance which has been designated as the “unit membrane” (unit membrane). The trilaminar structure is visualized as a dense outer layer, a clear staining middle, and dark staining inner layer.))appearance
2).it is comprised of phospholipid bilayers which are assembled with the hydrophilic phosphate heads facing the aqueous environment (inside and out side the cell ) and hydrophobic tails facing each other .
3).

Question 5

FUNCTION OF CELL MEMBRANE

Answer 5

1) Barrier between cytoplasm and external environment
2)Cell signaling
3)Cell recognition (surface antigens)
4)Cell-to-Cell adhesion
5)Site for enzyme catalyzed reactions
6)Anchoring the cytoplasm
7)Selection of substances that enter/leave the cell
8)Formation of hydrogen bonds with water for stability
9)receptors
10)communication
11)control the movement of ions
12)protect the cytoplasm

Question 6

CELL membrane is LIVING OR NONLIVING & COMPOSITION of cell membrane

Answer 6

Living in nature
arrangement of two layers parallel hydrophobic end face each other and hydrophilic and opposite to each other
Composition Phospholipid bilayer

Question 7

composition of Lipid ,protein and carbohydrate in Plasma membrane

Answer 7

It consists of 50% of lipid and
60%-80% of protein
small amount of carbohydrate(5-10%) in the form of glycoprotein and glycolipid

Question 8

Which substance or biological molecule is responsible for
fluidity selectively permeability of cell membrane( and in which organism this compound is found and where it is not present (2)

Answer 8

50% cholesterol in animals but not present in plants and bacteria

Question 9

Sandwich modle is and by and how can it be seen

Answer 9

Danielli and Davson and It is a unit cell
[lipid layer]
{protein layer}
[lipid layer ]

Question 10

FLUID mosaic modle by and explain

Answer 10

Plasma membrane is made up of Phospholipid bilayer. lipid in plasma membrane is a fluid

Question 11

Cell membrane in FMM show which types of movement

Answer 11

Two types of Movement
1)Transient(linear movement
2)Flip Flop(vibrate and rotate)

Question 12

Mosaic is a

Answer 12

Discontinuous layer of protein

Question 13

How protein is present in fluid mosaic modle

Answer 13

Proteins are mosaic ,discontinuous ,fully inserted in lipid sheath

Question 14

Two groups of protein

Answer 14

1)intrinsic protein
Integral or channel protein
2) extensive protein peripheral protein

Question 15

Glycoprotein

Answer 15

Coat of recognition
Receptors by peripheral protein

Question 16

What happens when glucose levels increases

Answer 16

glucose levels increase (connect with peripheral protein) and trigger liver cells to convert glucose into glycogen

Question 17

If ionic concentration changes become more acidic or basic then what will happen to enzyme

Answer 17

Activity of enzyme decreases

Question 18

Fluidity (change according to temperature)
effect of decreases temperature and increase of temperature

Answer 18

Decreases temperature more unsaturated fatty acids
Increases temperature (low unsaturated fatty acid)

Question 19

Fluid nature helps to maintain

Answer 19

Polar nature

Question 20

Plasma membrane is selectively permeable due to which type of orotein

Answer 20

Integral protein

Question 21

Transport and it’s type and kind

Answer 21

1)active transport
..diffusion
..osmosis
…calculated
…diffusion
2)passive transport

Question 22

Diffusion

Answer 22

Movement of gas molecules from the higher concentration to lower concentration

Question 23

Osmosis

Answer 23

Movement of water molecules from the higher concentration to the lower concentration

Question 24

Facilitated diffusion

Answer 24

Movement of ions through channel protein

Question 25

Active transport in plants example

Answer 25

Ascents of sap
Mineral absorb from soil closing and opening of stomata

Question 26

Phagocytosis and example

Answer 26

When cell engulf or intake of food particle a(also known as eating process)
Example .
WBCs picks (HLA ..plasma membrane receptors) up bacterial from blood stream

Question 27

HLA is a

Answer 27

(human leucocytic antigen )9_Plasma membrane receptors

Question 28

Pinacocytosis

Answer 28

Intake of liquid also known as drinking process of cell. ((Misunderstood as water enter by osmosis )) It is cell absorb hormone ((steroid))

Question 29

Exocytosis(outside)

Answer 29

,,Pancreas B cell secretes insulin
,,Zymogen protein digest by pepsin
,,Saliva by salivary gland

Question 30

How many cells in our body

Answer 30

36 trillion cells I out body

Question 31

Extensive protein features

Answer 31

*Make receptors when bind with lipid glycoprotein.it helps to cell to cell interaction
*HLA(human leucocytic antigen) found in WBCs
*Some time acts as an enzyme Adenylate anhydrase
Atpase F° -F1 particle
*Acts as an antigen when binds with glucose. (Glycoprotein) antigen on RBCs (blood group

Question 32

During transport of substances many substances passes through membrane but some have difficulty? Explain whoo

Answer 32

Natural gas molecules,glucose can pass ,which substances having charge can have difficulty in passing

Question 33

Red blood cell have special type of protein

Answer 33

A,B,AB and 0type

Question 34

Other molecular label lead to either acceptance orr rejection of transplanted kidney

Answer 34

Protein on plasma membrane

Question 35

Cell membrane is asymmetric due to

Answer 35

Protein