Photosynthesis: Light-Dependent Reactions and Calvin Cycle

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Questions and Answers

What does ATP stand for?

Adenosine triphosphate

What is the name of the process that uses light energy to convert carbon dioxide and water into glucose and oxygen?

Photosynthesis

What is the name of the process that breaks down glucose to release energy in the form of ATP?

Cellular respiration

What is the name of the molecule that is used by cells to store energy?

<p>ATP</p> Signup and view all the answers

What is the name of the molecule that is formed when ATP loses a phosphate group?

<p>ADP</p> Signup and view all the answers

What is the name of the process that uses energy to move molecules across a membrane against their concentration gradient?

<p>Active transport</p> Signup and view all the answers

What is the name of the process that uses energy to move molecules across a membrane with their concentration gradient?

<p>Passive transport</p> Signup and view all the answers

What is the name of the molecule that is used to carry electrons in the electron transport chain?

<p>NADH</p> Signup and view all the answers

What is the name of the process that occurs in the mitochondria and produces ATP?

<p>Oxidative phosphorylation</p> Signup and view all the answers

What is the name of the molecule that accepts electrons at the end of the electron transport chain?

<p>Oxygen</p> Signup and view all the answers

What is the name of the process that uses carbon dioxide to produce glucose?

<p>Calvin cycle</p> Signup and view all the answers

What is the name of the molecule that is used to carry energy from the light-dependent reactions to the Calvin cycle?

<p>NADPH</p> Signup and view all the answers

What is the name of the molecule that is used to store energy in the chloroplasts?

<p>ATP</p> Signup and view all the answers

What is the name of the process that occurs in the thylakoid membrane of chloroplasts?

<p>Light-dependent reactions</p> Signup and view all the answers

What is the name of the pigment that absorbs light energy in plants?

<p>Chlorophyll</p> Signup and view all the answers

What is the name of the process that converts carbon dioxide and water into glucose?

<p>Carbon fixation</p> Signup and view all the answers

What is the name of the molecule that is formed during carbon fixation?

<p>3-PGA</p> Signup and view all the answers

What is the name of the enzyme that catalyzes carbon fixation?

<p>Rubisco</p> Signup and view all the answers

What is the name of the molecule that is the starting material for the Calvin cycle?

<p>RuBP</p> Signup and view all the answers

What is the name of the molecule that is the product of the Calvin cycle?

<p>G3P</p> Signup and view all the answers

What is the name of the process that converts G3P into glucose?

<p>Glycolysis</p> Signup and view all the answers

Flashcards

Chemiosmosis

ATP is created by protons (H+) moving across the thylakoid membrane.

High Proton Concentration

Protons build up inside thylakoid membranes during light-dependent reactions.

Photophosphorylation

Making ATP using light energy.

NADPH

High energy molecule created in light-dependent stage

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Light-Independent Reactions

Reactions in photosynthesis not directly driven by light.

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Stroma

Fluid-filled space surrounding thylakoid membranes where Calvin cycle happens.

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Carbon Fixation

CO2 joins with RuBP, creating 3-PGA, a critical first step in the Calvin Cycle

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RuBP

5-carbon molecule that combines with CO2 in carbon fixation.

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3-PGA

3-phosphoglycerate, a 3-carbon molecule produced in carbon fixation.

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ATP

Adenosine triphosphate; carries energy

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ADP

Adenosine diphosphate; lower energy form of ATP.

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Light-Dependent Reactions

Reactions in photosynthesis that use light energy.

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Thylakoid membrane

Membranes inside chloroplasts where light-dependent reactions occur.

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6 G3P

Product of reactions from 3-PGA (using ATP and NADPH)

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Calvin Cycle

Light-independent reactions. uses ATP and NADPH to build glucose.

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Glucose

A sugar produced by plants during photosynthesis.

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CO2

Carbon dioxide. Taken in by plant for photosynthesis.

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$ 3-PGA + ATP + NADPH = 6G3P$

An equation showing the process in the Calvin Cycle where 3-PGA's become 6 G3P's in the presence of ATP and NADPH.

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G3P

Glyceraldehyde-3-phosphate, a 3-carbon carbohydrate produced in Calvin cycle.

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Study Notes

Photosynthesis - Light-Dependent Reactions

  • ATP is created through a process called chemiosmosis
  • High concentration of H+ protons builds up inside the thylakoid membrane
  • H+ ions move across the membrane to generate ATP
  • ADP combines with a free phosphate, forming ATP, a high-energy molecule
  • High-energy molecules NADPH and ATP are used in the Calvin Cycle

Calvin Cycle

  • Takes place in the stroma (outside thylakoid)
  • Carbon fixation: CO2 combines with RuBP
  • This unstable molecule splits into two 3-carbon molecules (3-PGA)
  • 3-PGA molecules combine with phosphate from ATP and H+ from NADPH
  • The result is G3P, a 3-carbon sugar molecule
  • One G3P molecule is used to make glucose
  • Other G3P molecules are used to regenerate RuBP, to continue the cycle

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