Respiration

Question 1

The need for cellular respiration

Answer 1

Respond to abiotic changes to the environment, for metabolic reactions like active transport

Question 2

where does glycolysis occur

Answer 2

cytoplasm of cells

Question 3

outline the process of glycolysis

Answer 3

glucose gets 2 phosphates from atp to become hexose bisphosphate, this splits in half to form 2x triose phosphate, phosphate groups get added to this to form triose bisphosphate, ADP molecules take up the 4x phosphate groups to form 4 ATP molecules. 2 NAD molecules take each take 1 H+ atom and become reduced , left with 2 pyruvate molecules

Question 4

Products of glycolysis and where they go (per 1 glucose molecule)

Answer 4

2 reduced NAD- oxidative phosphorylation
net gain of 2 ATP
2 pyruvate - krebs and link reacton

Question 5

Where does the link reaction occur

Answer 5

Mitochondrial matrix

Question 6

What Happens in the Link Reaction

Answer 6

Pyruvate (3c)- NAD takes a H+ to form reduced NAD, CO2 is lost. Acetate is formed (2c). Acetate combines with coenzyme A to form Acetyl Coenzyme A (2c)

Question 7

Decarboxylation

Answer 7

CO2 is lost

Question 8

Products of link reaction (per 1 glucose) and where do they go

Answer 8

2x Acetyl Coenzyme A- krebs
2x CO2- waste product
2x Reduced NAD- oxidative phosphorylation

Question 9

Where does the Krebs cycle occur

Answer 9

Mitochondrial matrix

Question 10

What Happens in the Krebs Cycle

Answer 10

Acetyl Coenzyme A (2c) loses the Coenzyme A and combines with oxaloacetate (4c) to form citrate (6c)- loses Co2, NAD gets reduced and a 5 carbon compound is formed Co2 is lost 2x NAD is reduced and 1x FAD and ATP is produced and oxaloacetate is reformed.

Question 11

Products of the Krebs Cycle and what happens to them (per 1 glucose molecule)

Answer 11

2x Oxaloacetate- reused
2x Coenzyme A- reused
4x Co2- waste product
2x ATP- energy
6x reduced NAD- oxidative phosphorylation
2x reduced FAD- oxidative phosphorylation