4bRespiration

Question 1

Organisms which generate ATP using light energy…

Answer 1

Photoautotrophs

Question 2

A coenzyme which removes hydrogen atoms from substrates…

Answer 2

NAD

Question 3

The breakdown of large molecules into smaller molecules…

Answer 3

Catabolism

Question 4

The splitting of glucose into 2 molecules of pyruvate…

Answer 4

Glycolysis

Question 5

Glycolysis occurs where ???

Answer 5

Cytoplasm of the cell

In both aerobic and anaerobic respiration

Question 6

Link reaction occurs where??

Answer 6

Matrix of mitochondria

Question 7

Kerbs cycle occurs where???

Answer 7

Matrix of Mitochondria

Question 8

Oxidative phosphorylation occurs where??

Answer 8

Inner mitochondrial membrane / cristae

Question 9

What are the 4 main stages of aerobic respiration??

Answer 9

Glycolysis
Link reaction
Krebs cycle
Oxidative phosphorylation

Question 10

Anaerobic respiration has two main stages - what are they???

Answer 10

Glycolysis and

Ethanol or Lactate Pathway (cytoplasm for all)

Question 11

What is the purpose for glucose being broken down into 2 pyruvate in glycolysis??

Answer 11

Glucose is a big 6C molecule and can’t fit through the mitochondrial membrane
Pyruvate is smaller 3C molecule and can fit through the mitochondrial later!!!

Question 12

Explain how glycolysis has a net gain of 2 ATP?

Answer 12

2 ATP are used and 4 ATP are made !

Question 13

Definition of a coenzyme ???

Answer 13

A coenzyme carrier a product from one reaction so it can be used in another reaction

Question 14

Products of the link reaction ???

Answer 14

2 CO2
2 NADH
2 acetyl coenzyme A

Question 15

What is the job of acetyl coenzyme A?

Answer 15

To transport acetyl form the link reaction to the Krebs cycle

Question 16

What are the products of the Krebs cycle??

Answer 16

4 CO2
6 NADH
2 FADH
2 ATP

Question 17

Respiration = ?

Answer 17

Respiration = turning glucose (and OTHER molecules) into ATP!!

Question 18

What happens is glycolysis??

Answer 18

1 glucose is broken down into 2 pyruvate

There is a net gain of 2 ATP

2 hydrogens are made, these reduce 2 NAD to make NADH

Question 19

Describe the part played by the inner membrane of the mitochondrion in producing ATP? (3 marks)

Answer 19

1) electrons transferred down electron transfer chain
2) produces energy to take protons into space between membranes
3) protons pass back through membrane/ into matrix/ through ATP synthase
4) energy used to combine ADP + Pi&raquo_space; ATP

Question 20

Give 2 ways in which the properties of ATP make it a suitable source of energy in biological processes ??

Answer 20

1. Energy released in small / suitable amounts
2. Soluble
3. Involves a single/ simple reaction