Question

multiple choice question
during the light-dependent reactions, an excited electron is passed to a series of carrier molecules and proteins embedded in the thylakoid membrane called

the electron transport system.

the calvin cycle.

the reaction center chlorophyll.

the photosystem.

Explanation:

1. Analyze each option:

• The Calvin cycle is part of the light - independent reactions (dark reactions) of photosynthesis, so it can be eliminated.
• The reaction center chlorophyll is the part of the photosystem where the electron gets excited initially, not the series of carrier molecules that the excited electron is passed to, so this option is incorrect.
• The photosystem is a complex that contains the reaction center and antenna pigments, but the series of carrier molecules and proteins that the excited electron is passed through is the electron transport system.
• The electron transport system in the thylakoid membrane consists of a series of carrier molecules and proteins that accept the excited electron and pass it along, which matches the description in the question.

Answer:

A. the electron transport system.