Photosynthesis Recap 1 - 2022

Which part organelle in the cell does Photosynthesis?

• Mitochondria

• Chlorophyll

• Chloroplast

• Cell membrane

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

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.

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)

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

• Oxygen, ATP, & NADPH

• Water and CO2

• Light, Water, and CO2

What is the purpose of ATP Synthase?

• Creates ATP

• Creates NADPH

• Creates NADP+

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

• NADPH

• ATP

• Oxygen

• Glucose