Cellular Respiration Chapter 6.9

Question 1

Compare Photosynthesis and respiration pathways

Answer 1

Photosynthesis Respiration

Glucose End product Start product

O2 released as The last electron acceptor
waste (split from ( joins with H+ to become water)
water)

Co2 Taken in the
Carbon Cycle

Question 2

The most ancient metabolic pathway

Answer 2

Glycolysis

Question 3

Why is Gly the most ancient pathway

Answer 3

Glycolysis evolved when the atmosphere lacked or had very little O2.

It enabled organisms to extract energy from simple compounds in the non living environment

Question 4

How did Photsynthesis evolve

Answer 4

May have originated in anaerobic cell that used hydrogen sulphide instead of water as an electron donor, releasing sulphur not oxygen in the environment

Question 5

what evidence that photosynthesis evolved from glycosis

Answer 5

some of the reactions from the calvin cycle are the reverse of some of those in the Calvin Cycle