5.7.3 structure of mitochondrion - NOT FINISHED

Question 1

cristae

Answer 1

inner highly-folded mitochondrial membrane

Question 2

mitochondrial matrix

Answer 2

fluid-filled inner part of mitochondria

Question 3

structure of mitochondria

Answer 3

• inner & outer phospholipid membrane = envelope
• outer membrane = smooth
• inner membrane = folded into cristae (large SA)
• proteins embedded in inner membrane & protein channels
• inter-membrane space between
• mitochondrial matrix = enclosed by inner membrane, semi-rigid & gel-like

Question 4

what does the mitochondrial matrix contain

Answer 4

• mitochondrial ribosomes
• looped mitochondrial DNA
• enzymes for link reaction/Krebs cycle

Question 5

what does the matrix contain? - link to function

Answer 5

1. enzymes - catalyse stages of respiration reactions
2. molecules of coenzymes NAD & FAD
3. oxaloacetate - 4 carbon compound which accepts acetyl group from link reaction
4. mitochondrial DNA - code for enzymes & other proteins
5. mitochondrial ribosomes - proteins are assembled

Question 6

structure of outer membrane - link to function

Answer 6

• phospholipid composition
• contain proteins = some form channels/carrier proteins allowing passage of molecules (eg, pyruvate) into mitochondrion

Question 7

structure of inner membrane - link to function

Answer 7

• lipid composition
• less permeable than outer membrane to small ions (eg. hydrogen ions - protons)
• folds (cristae) give large SA for electron carriers & ATP synthase enzymes embedded

Question 8

describe electron carriers (inner membrane)

Answer 8

protein complexes arranged in electron transport chains (involved in oxidative phosphorylation)

Question 9

structure of intermembrane space (relate to function)

Answer 9

• between outer/inner layers of mitochondrial envelope
• involved in oxidative phosphorylation
• inner membrane in close contact with matrix = NADH & FADH can easily deliver hydrogens to electron transport chain