BIOL 171 Exam 4

Photosynthesis

What formula is this?

CO₂ + H₂O + light energy → C₆H₁₂O₆ + O₂ + H₂O

reduction

What reaction occurs to CO₂ during photosynthesis?

oxidation

What reaction occurs to H₂O during photosynthesis?

Heterotroph

Term for an organism that cannot make its own food

Autotroph

Term for an organism that can make organic molecules from inorganic sources

Photoautotroph

Term for an organism that makes its own food from light

Stomata

Term for pores on a leaf where gases enter and exit

photoexcited

Electrons become ________________ through absorption

Photosystem II

Which photosystem occurs first?

Photolysis

Term for the oxidation of water by light

NADPH production

What is the primary goal of Photosystem I?

ETC

Where is energy released in Photosystem II?

H+ gradient

In photosynthesis, the chemiosmotic mechanism of ATP synthesis is driven by ___________?

P680

What is the name of the “reaction center” in PSII?

P700

What is the name of the “reaction center” in PSI?

2

When O₂ is produced in the thylakoid lumen by oxidation, how many electrons are transferred to P680?

NADP⁺ + 2 electrons + H⁺

How is NADPH created in photosynthesis?

Non-cyclic

Describe the electron flow where electrons begin at PSII and eventually transfer to NADPH through a linear process

Cyclic

Describe the electron flow where energy is released from PSI to transport H⁺ into the lumen then returns to PSI

Z scheme

What is the term for the zigzag figure depicting energy flow in photosynthesis?