Download Photosynthesis Study Guide ANSWERS

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Photosynthesis Study Guide – Test Monday
What are the energy carriers in photosynthesis?
APT and NADPH
How does ATP work (where is energy stored, how regenerated)?
Energy is stored in the 3rd phosphate bond; ADP is regenerated (recharged) into ATP by adding a Pi to ADP with
the help of ATP Synthase. Energy for the ATP Synthase comes from the H+ ion moving from high concentration
to low concentration.
What is a pigment? What is specific pigment involved in photosynthesis? How does light wavelength
(different colors) work with this pigment?
Pigment is a molecule which absorbs specific wavelengths of light (colors). Chlorophyll in involved in
photosynthesis. Blue and Reds are absorbed while GREEN is reflected.
What is balance equation for photosynthesis?
6CO2 + 6 H2O + light  C6H12O6 + 6O2
How do the reactants (inputs) get into the plant and what happens to the products (outputs)?
Water enter plant through roots and Carbon Dioxide enters through the stomata/stoma of the leaves.
Products: oxygen leaves thru stomata and glucose stay in plant to be used as food or as building block for
other molecules
What are the 2 phases or photosynthesis? Where do they take place in the chloroplast?
Light dependent reaction – thylakoid membrane
Light Independent (Calvin Cycle) - stroma
What are the reactants and products of each phase of photosynthesis?
Light dependent reaction –
Reactants – H2O & ADP/NADP
Light Independent (Calvin Cycle) –
Reactants – CO2 & ATP/NADPH
Products – O2 & ATP/NADPH
Products – Glucose & ADP/NADP
In basic terms, what happens to the reactants which make the products for each phase?
Light dependent reaction – water is split (photolysis); electrons are used to replace high energy electrons
which help make ATP and NADPH
Light Independent (Calvin Cycle) –CO2 is fixed/combined with other carbon molecule to make glucose. ATP &
NADPH provide energy needed to do this.
What organisms do photosynthesis?
Autotrophs – all plants, some protists, some bacteria