Plasma membrane

Question 1

Biomembranes include ____ and ________

Answer 1

Cell membrane & organellar membrane

Question 2

What 3 substances constitute cell membrane ?

Answer 2

Lipids , proteins , carbohydrates

Question 3

Human RBCs ( erythrocytes)

percentage of substances in cell membrane

Answer 3

Lipids = 40 percent
Proteins = 52 percent
Carbohydrates = 8

Question 4

True or False

Structurally , cell membrane of prokaryotes & eukaryotes is similar

Answer 4

TRUE

Question 5

Who gave the fluid mosaic model & when ?

Answer 5

Singer & Nicolsan ; 1972

Question 6

What is the fluid mosaic model ?

Answer 6

Proteins in mosaic pattern arranged in phospholipid bi-layer

Question 7

Lipid other than phospholipid present in cell membrane.

Answer 7

Cholestrol

Question 8

Cholestrol function

Answer 8

Provides strength

Question 9

Types of Proteins

Answer 9

Intrinsic ; Peripheral

Question 10

Types of Intrinsic protein

Answer 10

totally buried ; partially buried

Question 11

Types of totally buried proteins

Answer 11

Tunnel ; Carrier

Question 12

Carbohydrates in plasma membrane are also known as ________

Answer 12

Oligosaccharides

Question 13

Oligosaccharides meaning

Answer 13

Oligo = small => small chains
Saccharides = sugar

Question 14

Types of carbohydrates in cell membrane

Answer 14

Glycoprotein ; Glycolipid

Question 15

Glycoproteins are carbohydrates associated with

Answer 15

Proteins

Question 16

Glycolipids are carbohydrates associated with

Answer 16

Lipids

Question 17

2 components of phospholipids

Answer 17

Phosphate ion ; lipids

Question 18

Which component of phospholipid is polar ?

Answer 18

Phosphate ion ( PO4 3- )

Question 19

Which component of phospholipids is non - polar ?

Answer 19

Lipids

Question 20

True or false

SPhospholipid is an amiphipathic molecule as it has dual nature ( both polar head & non-polar tails)

Answer 20

TRUE

Question 21

Straight tail refers to

Answer 21

Saturated fatty acid

Question 22

Bent tail refers to

Answer 22

Unsaturated fatty acid

Question 23

Tails are ________ while head is _______

Answer 23

Hydrophobic ; hydrophilic

Question 24

Head is made up of

Answer 24

Phosphate ion

Question 25

Carbs are always found in which aspect of plasma membrane ?

Answer 25

Outer

Question 26

Carbs are always found in association with

Answer 26

Lipids , proteins

Question 27

__________nature of ______ enables ___________ of ________- and ability to move is measured in terms of its __________

Answer 27

quasifluid ; lipids ; lateral movement ; proteins ; fluidity

Question 28

functions enabled by fluid nature

Answer 28

Cell growth , intercellular junction , endocytosis , secretion , cell division

Question 29

Proteins are classified on the basis of

Answer 29

ease of extraction

Question 30

extrinsic proteins are involved in

Answer 30

Enzymatic activity

Question 31

Proteins which are tightly bound with phospholipids are

Answer 31

Intrinsic proteins

Question 32

Carbs are involved in

Answer 32

Cell to cell recognition

Question 33

give 2 examples of cell to cell recognition

Answer 33

Fertilisation ( sperm & ova) ; blood group antigens

Question 34

neutral solutes transport through which process & through which part of plasma membrane ?

Answer 34

Simple diffusion ; phospolipid bilayer

Question 35

Two types of transport are

Answer 35

active & passive

Question 36

2 types of passive transport are

Answer 36

Facilitated diffusion , simple diffusion

Question 37

Passive transport is ________ the concentration gradient& does not require ______. It is called __________ process.

Answer 37

(along ; energy(ATP) ; down - hill

Question 38

active transport is ________ the conc. gradient & requires ________ . It is called __________ process.

Answer 38

against ; energy( ATP) ; uphill

Question 39

Osmosis of water & ions takes place through

Answer 39

tunnel proteins

Question 40

Transport of polar molecules , large molecule , amino acids takes place through

Answer 40

Carrier proteins

Question 41

Active transport like Na+ K+ pump takes place via

Answer 41

Carrier(pump) proteins

Question 42

Bulk transport involves two processes which are

Answer 42

Endocytosis ( taking in ) ; Exocytosis / Emiocytosis ( throwing out/egestion of waste materials)

Question 43

Cell taking in solid complex materials in form of vesicles called _______ is called _________

Answer 43

phagosome , phagocytosis

Question 44

Cells taking in liquid material in form of vesicles called _________ is called ________

Answer 44

pinosomes ; pinocytosis