Photosynthesis and Light Reactions

These flashcards cover key concepts from the lecture on photosynthesis, focusing on energy acquisition, the role of pigments, the processes involved in light-dependent reactions, and their outcomes.

What do heterotrophs obtain their energy from?

Heterotrophs obtain food from other sources.

What do autotrophs produce their food from?

Autotrophs produce food from inorganic sources.

What is the role of ATP in plants?

ATP is needed for cellular respiration and energy transfer.

What is the formula for cellular respiration?

6H12O6 + 6O2 → 6CO2 + 6H2O.

What are the two main types of photosynthetic reactions?

Light-dependent reactions and light-independent reactions.

What is the goal of light-dependent reactions?

To capture light energy and generate ATP and NADPH.

Which pigments are involved in photosynthesis?

Chlorophyll a, Chlorophyll b, and Carotenoids.

What effect do carotenoids have on plants in the fall?

Carotenoids capture additional light wavelengths, protecting chlorophyll and causing colorful fall leaves.

What happens to an electron when it absorbs light energy?

The electron becomes photoexcited and moves to a higher energy state.

What is NADP+ reduced to in photosynthesis?

NADP+ is reduced to NADPH.

What is the electron donor for Photosystem II (PSII)?

The electron donor for PSII is H2O.

How do photosystems pass energy?

Electrons move from excited to grounded states, transferring energy until they reach the reaction center.

What powers ATP synthase during the light-dependent reactions?

An electrochemical gradient powers ATP synthase and produces ATP via chemiosmosis.

What is the primary function of chlorophyll in photosynthesis?

Chlorophyll absorbs light energy for the photosynthetic process.

What does the Calvin Cycle use from the light-dependent reactions?

The Calvin Cycle uses ATP and NADPH produced in the light-dependent reactions.