Fundamentals of Biology

Photosynthesis

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Session Overview

This session will introduce the general ideas of both cyclic and non-cyclic photophosphorylation and how these two processes are used by cells to generate the ATP and the NADPH needed for the Calvin Cycle in photosynthesis. Learning Objectives To know that photosynthesis can convert light energy into chemical energy. To understand how the light reactions convert solar energy into ATP and NADPH. To understand that the Calvin cycle uses the chemical energy of ATP and NADPH produced in the light reactions to reduce CO2 to sugar. To understand the relationships between cellular respiration and photosynthesis.

Session Activities

Lecture Video

Watch the lecture video excerpt

• Photosynthesis

Check Yourself

Question 1

The light reactions of non-cyclic photophosphorylation supply the Calvin Cycle with…

CO₂ and ATP close

NADPH and ATP check

light energy close

sugar and O₂ close

water and sugar close

Check

Question 2

Which of the following does not occur in the Calvin Cycle?

carbon fixation close

consumption of ATP close

oxidation of NADPH close

regeneration of NADP⁺ close

release of oxygen check

Check

Question 3

Which of the following is not true?

The light reactions of cyclic photophosphorylation generate ATP. close

The light reactions of cyclic photophosphorylation involve redox reactions. close

The light reactions of cyclic photophosphorylation produce NADPH. check

The light reactions of cyclic photophosphorylation use chemiosmosis. close

The light reactions of cyclic photophosphorylation use only
photosystem I. close

Check

Session Activities

Practice Problems

• Problems (PDF)
• Solutions (PDF)

Further Study

Useful Links

• Photosynthesis
• Shedding Light on Photosynthesis
• What is Photosynthesis?

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