Lesson Worksheet: The Light-Dependent Reactions Biology
In this worksheet, we will practice describing the reactions that occur in the light-dependent stage of photosynthesis and recalling the products formed.
What is the primary role of the proton pumps in the thylakoid membrane?
- ATo allow the diffusion of H⁺ ions from the thylakoid lumen into the stroma
- BTo absorb wavelengths of light to provide the energy needed for the light-dependent reaction
- CTo actively transport H⁺ ions from the stroma into the interior of the thylakoid (the lumen)
- DTo transport electrons along the electron transport chain
Which of the following tables correctly summarizes what happens to substances involved in the light-dependent reactions?
Substance Water ADP NADP+ Effect Synthesized Synthesized Reduced
Substance Oxygen ADP NADP+ Effect Photolyzed Synthesized Oxidized
Substance Water ATP NADP+ Effect Photolyzed Synthesized Reduced
Substance Water ATP NADP+ Effect Oxidized Synthesized Oxidized
Which of the following are products of the light-dependent reactions in photosynthesis?
- AATP and water
- BNADH and FADH
- CADP and NADP
- DATP and NADPH
Where in the chloroplast do the light-dependent reactions take place?
- AIn the inner membrane
- BIn the stroma
- CIn the cristae
- DIn the thylakoid membrane
At the beginning of the light-dependent reactions, water is split using light energy in a reaction known as photolysis.
What is produced when water is split in photolysis?
- A, oxygen, and electrons
- B and
- C, , and protons
A product of the light-dependent reactions is oxygen. What specific process produces oxygen?
- AThe photolysis of water
- BThe phosphorylation of ADP
- CThe movement of electrons through the electron transport chain
- DThe active transport of hydrogen ions
What happens to the coenzyme NADP+ in the light-dependent stage of photosynthesis?
- AIt loses electrons and a phosphate ion to become NAD.
- BIt gains an oxygen ion to become oxidized NADP (NADPO+)
- CIt gains electrons and H+ ions to become reduced NADP (NADPH).
- DIt loses electrons and a H+ ion to form NADP+.
What is the primary role of ATP synthase in the light-dependent reactions?
- ATo actively transport ions from the stroma and into the thylakoid lumen
- BTo phosphorylate ADP to create ATP
- CTo actively transport electrons along the electron transport chain
- DTo absorb wavelengths of light to provide the energy needed for the light-dependent reactions
Which charged particle generates the energy required for the phosphorylation of ADP when it moves through ATP synthase?
The diagram provided shows a simple outline of the light-dependent reaction, with key reactants and products removed.
What reactant has been replaced with label 1?
What product has been replaced with label 2?