BIOS 2011 Lab 2 Photosynthesis

The antenna system the thylakoid membrane contains

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: r through the mediation of soluble enzymes in the stroma (that is, unlike the molecules involved in the light reactions, the enzymes involved in the dark reactions are not embedded in a membrane). The Antenna System The thylakoid membrane contains many proteins, including pigments such as chlorophyll a and chlorophyll b, the two predominant pigments in green plants. Chlorophyll normally exists in a ground state. However, when light strikes a chlorophyll molecule, its chemical structure allows it to achieve an excited state. The "state" refers to the level of energy of the electrons associated with the molecule. When a photon of light strikes a chlorophyll molecule, the light energy is used to elevate an electron to a higher energy state. If the electron returns immediately to its original state, the energy is re ­emitted as fluorescence or heat. Otherwise, the excitation energy is...
View Full Document

Ask a homework question - tutors are online