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Chapter 8
Thomas More College
44
Biology
Undergraduate 1
11/01/2012

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Term
What is life powered by?
Definition
the sunshine
Term
What percentage of the supply of energy is powered by photosynthesis?
Definition
1 %
Term
What is photosynthesis?
Definition
the process by which certain organisms capture energy from the sun and uses it to build food molecules
Term
What are photons?
Definition
units or pockets of energy in light
Term
What waves have the most energy? least?
Definition
gamma, radio
Term
The higher the energy, the wavelength is what?
Definition
shorter
Term
visible light is between what nm?
Definition
400 to 740
Term
What is the absorbance spectrum?
Definition
  the arrangment of photons that a substance is capable of absorbing
Term
What are the three stages of photosynthesis?
Definition

1. capture energy from the sun

2. use the energy captured to make ATP and NADPH 

3. the ATP and NADPH are used to "power" the synthesis of organic molecules from CO2. 

Term
What is the photosystem composed of?
Definition
attena complex and reaction center
Term
What are the two critical components of photosystem one?
Definition
700 nm
Term
What are the critical componenets of photosystem two?
Definition
680 nm, atp 
Term
What are the first two stages of photosynthesis known as?
Definition
light dependent reactions
Term
What is the third stage of photosynthesis known as?
Definition
carbon fixation
Term
The photosynthesis equation is opposite of what?
Definition
respiration
Term
What does the stroma contain?
Definition
enzymes needed to assemble organic molecules from co2
Term
What forms photosystems?
Definition
clusters of photosynthetic pigments
Term
What is the photoelectric effect?
Definition
a beam of light that is able to remove electrons from certain molecules and create an electrical current
Term
Green plant photosynthesis uses what two things?
Definition
chlorophyll and carotenoids
Term
Describe chlorophyll a.
Definition
is the main photosynthetic pigments in plants and cyanobacteria and the only pigment that can convert light to chemical energy
Term
describe chlorophyll b.
Definition
these are accessory pgiments, it adds to the absorption of cholorphyll a
Term
what are carotenoids?
Definition
they are carbon rings linked to chains with alternating single and double bonds
Term
what are phycobiloproteins?
Definition
these are accessory pigments found in cyanobacteria and some algae
Term
What kind of complex is the antenna complex? reaction center?
Definition
light harvesting, transmembrane protein-pigment
Term
Light-Dependent Reactions are also known as what?
Definition
thylakoid reactions
Term
What are the four stages of thylakoid reactions?
Definition
primary photoevent, charge separation, electron transport, and chemisosmosis
Term
what happens in the primary photoevent stage?
Definition
 a photon of light is captured by a pigment 
Term
what happens in the charged separation stage?
Definition
excited energy is transferred to the reaction center and an electron transfers to an acceptor molecule
Term
what happens in the electron transport stage?
Definition
electrons are shuttled along a series of electron carrier molecules that are embedded in the photosynthetic membrane
Term
what happens in the chemiosmosis stage?
Definition
the protons accumulate on one side of the membrane and flow throught the membrane through atp synthase
Term
What is noncyclic photophosphorylation?
Definition
when plants use both photosystem one and two in a two stage process
Term
What contains the calvin cycle?
Definition
the stroma
Term
what four complexes are responsible for light dependent reactions?
Definition
 photosystem one and two, cytochrome b6-f, and atp synthase
Term
where is photosystem two found?
Definition
the grana
Term
where is photosystem one and atp synthase found?
Definition
stroma lamella and cytochrome
Term
where is the cytochrome b6-f complex found?
Definition
between the grama and stroma lamella
Term
what cycle of reactions allows carbon fixation?
Definition
calvin cycle
Term
what event makes the reduction of co2 possible?
Definition
the attachment of ribulose 1,5 bisphosphate
Term
What are the 3 phases of the calvin cycle?
Definition
carbon fixation, reduction, and regeneration
Term
describe carbon fixation
Definition
when RuBP reacts with a 6 carbon molecule and immediately splits into 2, 3 phosphoglycerates
Term
What enzyme carries out the carbon fixation reaction?
Definition
rubisco
Term
What is photorespiration?
Definition
the oxidizing of RuBP
Term
What happens when 3 turns of the calvin cycle occurs?
Definition
molecule of G3P
Term
What happens in 6 turns of the calvin cycle?
Definition
one gluclose molecule
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