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Cell : The Unit of Life > Plasma membrane > Flashcards

Plasma membrane Flashcards

1
Q

Biomembranes include ____ and ________

A

Cell membrane & organellar membrane

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2
Q

What 3 substances constitute cell membrane ?

A

Lipids , proteins , carbohydrates

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3
Q

Human RBCs ( erythrocytes)

percentage of substances in cell membrane

A

Lipids = 40 percent
Proteins = 52 percent
Carbohydrates = 8

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4
Q

True or False

Structurally , cell membrane of prokaryotes & eukaryotes is similar

A

TRUE

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5
Q

Who gave the fluid mosaic model & when ?

A

Singer & Nicolsan ; 1972

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6
Q

What is the fluid mosaic model ?

A

Proteins in mosaic pattern arranged in phospholipid bi-layer

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7
Q

Lipid other than phospholipid present in cell membrane.

A

Cholestrol

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8
Q

Cholestrol function

A

Provides strength

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9
Q

Types of Proteins

A

Intrinsic ; Peripheral

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10
Q

Types of Intrinsic protein

A

totally buried ; partially buried

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11
Q

Types of totally buried proteins

A

Tunnel ; Carrier

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12
Q

Carbohydrates in plasma membrane are also known as ________

A

Oligosaccharides

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13
Q

Oligosaccharides meaning

A

Oligo = small => small chains
Saccharides = sugar

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14
Q

Types of carbohydrates in cell membrane

A

Glycoprotein ; Glycolipid

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15
Q

Glycoproteins are carbohydrates associated with

A

Proteins

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16
Q

Glycolipids are carbohydrates associated with

A

Lipids

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17
Q

2 components of phospholipids

A

Phosphate ion ; lipids

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18
Q

Which component of phospholipid is polar ?

A

Phosphate ion ( PO4 3- )

19
Q

Which component of phospholipids is non - polar ?

A

Lipids

20
Q

True or false

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

A

TRUE

21
Q

Straight tail refers to

A

Saturated fatty acid

22
Q

Bent tail refers to

A

Unsaturated fatty acid

23
Q

Tails are ________ while head is _______

A

Hydrophobic ; hydrophilic

24
Q

Head is made up of

A

Phosphate ion

25
Q

Carbs are always found in which aspect of plasma membrane ?

A

Outer

26
Q

Carbs are always found in association with

A

Lipids , proteins

27
Q

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

A

quasifluid ; lipids ; lateral movement ; proteins ; fluidity

28
Q

functions enabled by fluid nature

A

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

29
Q

Proteins are classified on the basis of

A

ease of extraction

30
Q

extrinsic proteins are involved in

A

Enzymatic activity

31
Q

Proteins which are tightly bound with phospholipids are

A

Intrinsic proteins

32
Q

Carbs are involved in

A

Cell to cell recognition

33
Q

give 2 examples of cell to cell recognition

A

Fertilisation ( sperm & ova) ; blood group antigens

34
Q

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

A

Simple diffusion ; phospolipid bilayer

35
Q

Two types of transport are

A

active & passive

36
Q

2 types of passive transport are

A

Facilitated diffusion , simple diffusion

37
Q

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

A

(along ; energy(ATP) ; down - hill

38
Q

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

A

against ; energy( ATP) ; uphill

39
Q

Osmosis of water & ions takes place through

A

tunnel proteins

40
Q

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

A

Carrier proteins

41
Q

Active transport like Na+ K+ pump takes place via

A

Carrier(pump) proteins

42
Q

Bulk transport involves two processes which are

A

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

43
Q

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

A

phagosome , phagocytosis

44
Q

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

A

pinosomes ; pinocytosis

Cell : The Unit of Life (16 decks)

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