RESPIRATION

Question 1

photosynthesis

Answer 1

chloroplast
reactants: CO2 and H20
products: sugars and O2
energy: stored
role: pathway of carbon fixation

Question 2

respiration

Answer 2

mitochondrion
reactants: sugars and O2
products: Co2 and H2O
energy: released
role: oxidation of photosynthesis

Question 3

glycolysis

Answer 3

Conversion of the hexose sugar glucose into 2 pyruvates
- 4 ATP formed + 2 ATP used = net gain of 2 ATP
- Chemical reactions in cytoplasm
- 1 Glucose → 2 Pyruvate + 2 ATP + 2 NADH + 2

Question 4

Oxidative pentose phosphate pathway

Answer 4

Chemical reactions in cytoplasm and plastid
- Release of CO2and production of 2 NADPH
Products: NADPH and Ribulose-5-phosphate
Chemical reactions of oxidative pentose phosphate pathway in plastids:
- Major supplier of NADPH in non-
photosynthetic plastids (e.g.
Amyloplastin roots)

Question 5

Citric acid cycle

Answer 5

Pyruvate enters the mitochondrion
- Chemical reactions in
mitochondrion matrix
- Oxidation of pyruvate
- Stage 1: C4 + C2 → C6
(Carbon condensation)
- Stage 2: OAA regeneration
from Succinyl CoA
Reaction of 2 Pyruvate molecules from glycolysis

Question 6

Citric acid cycle yields

Answer 6

6 CO2, 2 ATP, 8 NADH, 2 FADH2

Question 7

Oxidative phosphorylation

Answer 7

The final step in energy producing metabolism
Electron energy in NADHand FADH2 is used to produce ATP

Question 8

Mitochondrion

Answer 8

NADH and FADH2 are e- donors
O2 is an e- acceptor

Question 9

Chloroplast

Answer 9

Light converts H2O to be an e- donor
NADP+ is e- acceptor