an electron carrier that can accept two electrons. it has an additional phosphate group.
the distance between the peaks in a wave pattern.
encompasses all possible wavelengths of electromagnetic radiation, from relatively short wavelengths (gamma rays) to much longer wavelengths (radio waves).
massless particles traveling in a wavelike pattern and moving at the speed of light.
used to describe a molecule that can absorb light energy.
Chlorophyll a & b
pigments found in green plants and green algae.
pigment found in chloroplasts. yellow to red.
a diagram that depicts the wavelengths of electromagnetic radiation that are absorbed by a pigment.
shows the rate of photosynthesis plotted as a function of different wavelengths of light.
Photosystem 1 & 2
found in the thylakoid membrane they are two distinct complexes of proteins and pigment molecules.
a series of electron carriers-located in the thylakoid membrane.
a pattern of electron flow that is cyclic and generates only ATP. Also called the Cyclic Electron Flow.
When two or more genes are similar because they are derived from the same ancestral gene.
in the thylakoid membrane it is composed of several dozen pigment molecules that are anchored to transmembrane proteins. They directly absorb photons of light.
Resonance Energy Transfer
a process that transfers energy to adjacent pigment molecules.
another term for the light-harvesting complex because it acts like an antenna that absorbs energy from light and funnels that energy to P680 in the reaction center.
Primary Electron Acceptor
a molecule that is more stable and accepts the high energy electron from P680.
where water oxidation occurs. it is located on the side of D1 that faces the thylakoid lumen.
a method researchers used to determine the three-dimensional structure of photosystem 2. they must purify a protein or protein complex and expose it to conditions that cause the proteins to associate with each other in an ordered array.
increasing the rate of photosynthesis by exposing algae to two wavelengths at the same time rather than just one.
a model that shows an electron proceeds through a series of energy changes during photosynthesis.
CO2 becomes incorporated into ribulose biphosphate (RuBP), a five-carbon sugar. The product of the reaction is a six-carbon intermediate that immediately splits in half to form two molecules of 3-phosphoglycerate.
the enzyme that catalyzes carbon fixation. it is most abundant protein in chloroplasts and perhaps the most abundant protein on earth.
uses O2 and liberates CO2. it decreases the efficiency of photosynthesis.
an enzyme that adds CO2 to phosphoenolpyruvate (PEP), a three carbon molecule, to produce oxaloacetate, a four carbon compound malate, which is transported into the bundle- sheath cell.
they avoid water loss by keeping their stomata closed during the day and open them at night, when it is cooler and the relative humidity is higher.