FerredoxinNADP+ Oxidoreductase (Photosynthesis Part 6)

The video explains the role of ferredoxin in photosynthesis, focusing on its interaction with the enzyme ferredoxin-NADP+ oxidoreductase to produce NADPH, which is crucial for the Calvin Cycle and glucose synthesis. It details the electron transfer mechanism within the enzyme, highlighting the formation of FADH and NADPH. The video also distinguishes between cyclic and non-cyclic electron flow and discusses the regulation of the enzyme under different light conditions, emphasizing its activity in the stroma during light reactions.

What is the primary role of NADPH in the Calvin Cycle?

• To supply electrons for glucose synthesis

• To transport oxygen molecules

• To act as a structural component of chlorophyll

• To provide energy for cellular respiration

Which amino acids are involved in the electron transfer process in ferredoxin ADP plus oxidoreductase?

• Lysine and Methionine

• Threonine and Isoleucine

• Serine and Valine

• Alanine and Glycine

What is the result of the electron transfer process in ferredoxin ADP plus oxidoreductase?

• Production of NADPH

• Formation of ATP

• Synthesis of chlorophyll

• Release of oxygen

What distinguishes non-cyclic electron flow from cyclic electron flow?

• Non-cyclic flow involves only photosystem II

• Cyclic flow produces NADPH

• Non-cyclic flow results in the production of NADPH

• Cyclic flow generates glucose directly

Under what conditions does ferredoxin ADP plus oxidoreductase exist as a monomer in the stroma?

• In the presence of high light intensity

• During dark conditions

• Under acidic conditions

• When the stroma has a low pH

How does the pH of the stroma affect the activity of ferredoxin ADP plus oxidoreductase?

• Higher pH increases enzyme activity

• Lower pH increases enzyme activity

• pH has no effect on enzyme activity

• Higher pH decreases enzyme activity

What happens to ferredoxin ADP plus oxidoreductase in the dark?

• It dissociates from the thylakoid membrane

• It converts NADPH back to NADP+

• It dimerizes and attaches to the thylakoid membrane

• It becomes more active