Biochemistry

Photosynthesis

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Session Overview

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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

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

Further Study

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Learning Resource Types

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theaters Lecture Videos