Mitochondrion

Question 1

What are the 7 parts of the mitochondrion?

Answer 1

Matrix, crista, ribosomes, outer membrane, fluid filled space, inner membrane, loop of DNA

Question 2

What does the double membrane do?

Answer 2

Isolates reactions of the Kreb cycle and electron transfer from the general cytoplasm

Question 3

Why does the double membrane isolate reactions of the Kreb’s cycle and electron transfer from the general cytoplasm?

Answer 3

To maintain high concentrations of enzymes and substrates which increases the rate of respiratory reactions

Question 4

What is a feature of the outer membrane?

Answer 4

Permeable to small molecules like sugars, salts and nucleotides

Question 5

Feature of the inner membrane?

Answer 5

Selectively permeable

Question 6

Why is the inner membrane selectively permeable?

Answer 6

So the mitochondrion can control the chemical composition of the matrix, optimising conditions for enzyme activity

Question 7

What is the inner membrane spanned by?

Answer 7

Proteins (porins)

Question 8

What do the proteins on the inner membrane of the mitochondrion allow?

Answer 8

Entry of pyrovic acid and oxygen, exit of ATP and CO2

Question 9

What is the inner membrane folded in to?

Answer 9

Cristae

Question 10

Why is the inner membrane folded into cristae?

Answer 10

To increase the SA for attachment of enzymes and co-enzymes involved in the electron transfer chain.
Allows the sequential attachment of electron carriers in the ETC

Question 11

What does the matrix contain?

Answer 11

70S ribosomes, DNA and enzymes