Topic 2

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What is Fick's diffusion law?
Rate of diffusion is proportional to surface area x concentration gradient / diffusion distance
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Name three ways that the mammalian lung system is adapted for rapid diffusion
Many alveoli, thin endothelial cells and constant oxygen supply
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Why is a phospholipid bilayer known as a fluid mosaic
It can move and is made up of many parts
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Name all the parts of the fluid mosaic model
Extrinsic and intrinsic proteins, cholesterol, lipids and proteins
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What is the difference between an intrinsic and an extrinsic protein
Extrinsic spans one layer and intrinsic spans both q
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What is each layer of the membrane called
Leaflet
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Describe the structure of a phospholipid
It contains a polar hydrophilic head that faces outwards into the fluid and a non polar hydrophobic tail facing inwards
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What does passive transport mean and give three examples
Flow of substances down a concentration gradient with no energy required, diffusion, facilitated diffusion and osmosi
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Describe facilitated diffusion
Big and polar molecules can't enter through the phospholipids and so travel along a channel or carrier protein
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Describe osmosis
Net movement of water down a concentration gradient through a partially permeable membrane
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Describe active transport
Substances move against the concentration gradient through carrier proteins, this requires energy
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What is the difference between exo and endocytosis
Endo is the movement into the cell and exo is the movement out of the cell, both use vesicles
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Which bond holds together two nucleotides in a nucleic acid
Phosphodiester bond
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Name the 4 complementary base pairs and which bonds holds them together
Adenine, guanine, thymine, cytosine and hydrogen bonds
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Name two differences between RNA and DNA
DNA contains deoxyribose and RNA contains ribose, RNA doesn't contain thymine but uracil instead
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What is unique about the DNA sugar phosphate backbone
It is inverted
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What reaction forms nucleic acids?
Condensation reactions
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Name the two strands of DNA
sense and antisense or coding and template
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What is the purpose of tRNA
Carries anticodons complementary to codons on the mRNA
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Card 2

Front

Name three ways that the mammalian lung system is adapted for rapid diffusion

Back

Many alveoli, thin endothelial cells and constant oxygen supply

Card 3

Front

Why is a phospholipid bilayer known as a fluid mosaic

Back

Preview of the front of card 3

Card 4

Front

Name all the parts of the fluid mosaic model

Back

Preview of the front of card 4

Card 5

Front

What is the difference between an intrinsic and an extrinsic protein

Back

Preview of the front of card 5
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