7.2 - Energy for action

Question 1

How many phospholipid membranes does a mitochrondria cell have?

Answer 1

2

Question 2

What are the 2 characteristics of the outer membrane of a mitochondria?

Answer 2

1. smooth
2. permeable to several small molecules

Question 3

What are the 4 characteristics of the inner membrane of a mitochondria?

Answer 3

1. folded (cristae)
2. less permeable
3. site of electron transport chain
4. location of ATP synthase

Question 4

What are the 2 characteristics of the intermembrane space?

Answer 4

1. low pH - due to high conc of protons
   2.

Question 5

What are the 2 characteristics of the matrix in the mitochondria?

Answer 5

• it is an aqueous solution within the inner membranes of the mitochondrion
• contain ribosomes, enzymes & circular mitochondrial DNA necessary for mitochondria

Question 6

What is the first reaction of substrate-level respiration?

Answer 6

glycolysis

Question 7

What are the 2 reactions which take place during glycolysis?

Answer 7

• phosphorylation
• oxidation

Question 8

What happens during the phosphorylation reaction, of glycosis?

Answer 8

• glucose is phosphorylated by adding 2 phosphates from 2 molecules of ATP
• increases the reactivity of glucose
• the molecules are then split into 2 molecules of 3C intermediate compounds
• 2 ADP are also made

Question 9

What happens in the oxidation react, of glycosis?

Answer 9

1. triose phosphates are oxidised forming 2 molecules of pyruvate
2. 2 hydrogen ions are also removed
3. Coenzyme NAD+ collects the hydrogen ions, to form 2 reduced NAD molecules