A.8 - Photosythesis and respiration

Question 1

What do light dependent reations convert?

Answer 1

ADP → ATP

NADP⁺ → NADPH

Question 2

Give the light independent reaction

Answer 2

CO₂ → Glucose

with RuBisCO Enzyme

Question 3

What role does water play in the light dependent reactions?

Answer 3

H₂O → O₂

Oxidation

Question 4

The NADPH and ATP is used to power…

Answer 4

The Reduction and Regeneration steps of the light independent reactions.

Question 5

What is the fate of Triose Phosphate (formed in the Calvin Cycle)?

Answer 5

• Used in Starch Formation
• Transported into cytosol

Question 6

What is Triose Phosphate used for in the Cytosol?

Answer 6

Converted to sucrose

Question 7

What is a fructan?

Answer 7

Polymers of fructose

e.g Inulin

Question 8

What can Grazing Fructans cause?

Answer 8

Laminitis in Horses

Caused by toxins released by bacteria in the caecum

Question 9

What is the C₄ cycle?

Answer 9

1. CO2 capture by mesophyll cells, forming C4
2. C4 is then decarboxylated to form CO2
3. This is used in the Calvin cycle
4. The remaining C3 is recycled in the mesophyll cells

Question 10

What occurs in CAM photosynthesis?

Answer 10

At night

1. Cells absorb CO₂
2. CO₂ → Malate

This is then used as a CO₂ reservoir

Question 11

1. Which reaction converts sugars to organic acids?
2. Where does it occur?

Answer 11

1. Glycolysis & Pentose Phosphate pathways
2. Cytosol and Plastid

Question 12

What is a byproduct of glycolysis and penose phosphate pathways?

Answer 12

NADH/NADPH and ATP

Question 13

NADH provides energy for…

Answer 13

ATP synthesis