Topic 2 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelEdexcel Created by: champion1607Created on: 15-05-18 19:57 What is Fick's diffusion law? Rate of diffusion is proportional to surface area x concentration gradient / diffusion distance 1 of 19 Name three ways that the mammalian lung system is adapted for rapid diffusion Many alveoli, thin endothelial cells and constant oxygen supply 2 of 19 Why is a phospholipid bilayer known as a fluid mosaic It can move and is made up of many parts 3 of 19 Name all the parts of the fluid mosaic model Extrinsic and intrinsic proteins, cholesterol, lipids and proteins 4 of 19 What is the difference between an intrinsic and an extrinsic protein Extrinsic spans one layer and intrinsic spans both q 5 of 19 What is each layer of the membrane called Leaflet 6 of 19 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 7 of 19 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 8 of 19 Describe facilitated diffusion Big and polar molecules can't enter through the phospholipids and so travel along a channel or carrier protein 9 of 19 Describe osmosis Net movement of water down a concentration gradient through a partially permeable membrane 10 of 19 Describe active transport Substances move against the concentration gradient through carrier proteins, this requires energy 11 of 19 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 12 of 19 Which bond holds together two nucleotides in a nucleic acid Phosphodiester bond 13 of 19 Name the 4 complementary base pairs and which bonds holds them together Adenine, guanine, thymine, cytosine and hydrogen bonds 14 of 19 Name two differences between RNA and DNA DNA contains deoxyribose and RNA contains ribose, RNA doesn't contain thymine but uracil instead 15 of 19 What is unique about the DNA sugar phosphate backbone It is inverted 16 of 19 What reaction forms nucleic acids? Condensation reactions 17 of 19 Name the two strands of DNA sense and antisense or coding and template 18 of 19 What is the purpose of tRNA Carries anticodons complementary to codons on the mRNA 19 of 19
Essay 22: The transfer of energy between different organisms and between these organisms and their environment 0.0 / 5
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