Photosynthesis Light Dependent Reaction

What does light do when it strikes the chlorophyll molecules of photosystem I & II?

• Light causes glucose to be synthesized (created) directly inside the chlorophyll molecules of the photosystems.

• Light causes the conversion of water into carbon dioxide, oxygen, and electrons

• Light directly causes carbon dioxide to attach to NADP+ to make NADPH

• Light causes electrons to get excited (gain energy) and travel down an electron transport chain embedded in the thylakoid membrane

Tags

NGSS.HS-LS1-5

After light excites electrons and they leave Photosystem II to travel down the first electron transport chain. How are these electrons replaced in Photosystem II?

• Oxygen is reduced and the electrons are given to the chlorophyll molecules of photosystem II

• Carbon dioxide is split. The electrons are given to the chlorophyll molecules of photosystem II

• Hydrogen undergoes fusion. The electrons are given to the chlorophyll molecules of photosystem II

• Water is split. The electrons are given to the chlorophyll molecules of photosystem II

The splitting of water at photosystem II is known as ________ and results in the production of __________.

• Photosynthesis: Carbon Dioxide, Water, ADP, and NADP+

• Photolysis: Oxygen, Hydrogen Ions (protons), and electrons that are given to photosystems II

As the electrons travel from photosystem II down the first electron transport chain, their energy is used to...

• Form oxygen, water, NADPH, and Glucose

• Pump hydrogen ions into the thylakoid space, producing a concentration gradient that will later be used by ATP synthase to form ATP

• Pump hydrogen ions into the stroma, producing a concentration gradient that will later be used by ATP synthase to form ATP.

Tags

NGSS.HS-LS2-3

Why do hydrogen ions flow from the thylakoid space to the stroma through ATP synthase?

• They are pumped actively through ATP synthase. This uses up ATP energy and creates ADP and Phosphate

• They flow passively from high to low concentration via facilitated diffusion. As they flow through ATP synthase, the enzyme spins and produces ATP

• Hydrogen ions do not actually flow from the thylakoid space to the stroma. They flow against equilibrium

After the electrons get excited by light a second time (at photosystem I), where do they end up going?

• They travel down a second electron transport chain and are donated to ADP, to make ATP

• They remain excited and then travel to photosystem II where they get even more excited until they combust

• They travel down a second electron transport chain and are donated to NADP+ to make NADPH (an electron carrier)

Tags

NGSS.HS-LS1-5

What are the products (created) from the light-dependent reactions?

• Oxygen, ATP, & NADPH

• Water and CO2

• Light, Water, and CO2

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Which of the following is NOT a product of the light-dependent reaction?

• NADPH

• ATP

• Oxygen

• Glucose

Tags

NGSS.HS-LS1-5

What does ATP Synthase do in the light-dependent reaction?

• Breaks down ATP into ADP + a phosphate group

• Converts NADP+ into NADPH

• Converts ADP + P into ATP

• Converts NADPH into NADP+

Where does the light-dependent reaction take place?

• Outer Membrane

• Thylakoid

• Stroma

• Inner membrane