3.5 - Photosynthesis

Question 1

Where did photosynthesis first evolve?

Answer 1

Prokaryotic cells

Question 2

What is responsible for the oxygenated atmosphere?

Answer 2

prokaryotic cyanobacterial photosynthesis

Question 3

Chlorophyll function

Answer 3

Absorb light energy to boost electrons in photosystems I and II.

Question 4

What are photosystems I and II?

Answer 4

Captures light in the internal membranes of the chloroplasts.
- transfers high energy electrons through ETC.

Question 5

What is established as electrons are transferred?

Answer 5

The electrochemical gradient of protons across the internal membrane

Question 6

Why is the proton gradient important?

Answer 6

It synthesizes ATP from ADP.

Question 7

Light independent reactions

Answer 7

• Calvin Cycle
  Occurs in the stroma

Question 8

Light-dependent reactions

Answer 8

Photosynthesis
Occurs in the thylakoids
- Light and water needed
- Releases oxygen

Question 9

Light dependent reactions produce

Answer 9

NADPH & ATP to the Calvin cycle

Question 10

The Calvin Cycle produces

Answer 10

ADP + PI and NADP+ to the light dependent reaction
- releases glucose
- requires CO2

Question 11

Major processes of photosynthesis:

Answer 11

• Excited electrons leave chlorophyll and reduce NADP+ to NADPH
• Move through ETC & provide energy to pump H+ into inner thylakoid
  H+ converts ADP to ATP

Question 12

Photosystem II

Answer 12

Hydrolyzes water and releases oxygen and H+