Lipids And Membranes Osmosis Flashcards

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1
Q

List some properties of lipids

A
Made up of C,H and O 
Macromolecules 
They are insoluble in water 
Dissolve in ethanol 
Good energy source 
Poor conductor heat and electricity
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2
Q

List some functions of lipids

A
Component of cell membranes 
Protection of vital organs 
Water proofing, to prevent evaporation 
To thermally insulate the body 
For electrical insulation, forming the myelin sheath around some neurones 
As a water source
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3
Q

Testing for lipids

A
  1. Break up small sample into a test tube with a glass rod. Add approx 2cm3 of ethanol mix well with glass rod
  2. Put approx 2cm3 of distilled water in a test tube
  3. Pour ethanol from first test tube into the body water in the second test tube and invert it to mix
    Milky white emulsion forms lipid is present
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4
Q

Triglyceride:-
Formed by?
Molecules?
Bond?

A

Formed by a condensation reaction between a Glycerol and 3 fatty acids

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5
Q

Draw how a triglyceride is formed

A

Remove the H20

Called esterification

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6
Q

Draw fluid mosaic model

A

Phospholipid bilayer with embedded proteins.
Glycoproteins and glycolipids involved in cell recognition and signalling
Cholesterol

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7
Q

Functions of the plasma membrane

A

Partially permeable membrane
Selectively permeable
Cell recognition
Cell signalling

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8
Q

Movement of molecules across the plasma membrane list?

A

Simple diffusion
Facilitated diffusion
Active transport
Endocytosis and exocytosis

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9
Q

Define diffusion

A

The passive movement of molecules from an area of high concentration to an area of low concentration until an equilibrium is reached

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10
Q

Define osmosis

A

The diffusion of water from an area of higher water potential to an area of lower water potential, through a partially permeable membrane

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11
Q

What is a isotonic solution
What is a hypotonic solution
What is a hypertonic solution

A

Where there is no net movement of water
Water may enter the cell
Water may leave the cell

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12
Q

Percentage change equation

A

Change = (change/original)x100

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13
Q

What is facilitated diffusion?

A

A passive process where substances pass through a carrier protein, down a concentration gradient e.g amino acids, glucose

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