Lecture 8 - Photosynthesis Flashcards
process by which plants, algae, and some microorganisms harness solar energy and convert it to chemical energy
Photosynthesis
True/False: with few exceptions, all life on earth ultimately depends on photosynthesis
True
Photosynthesis Equation
6CO2 + 6H2O + light –> C6H12O6(Glucose) + 6O2
range of all possible frequencies of radiation
electromagnetic spetrum
organelle of photosynthesis
chloroplast
Chloroplast physiology:
2 outside membranes enclosed
stroma
grana
gelitonous with enzymes, ribosomes, DNA, and grana
stroma
stack of thylakoids
grana
where do light eractionsoccur
in thylakoid membrane
what do light reactions do
convert solar energy to chemical energy
Light Reactions:
energy from captured photons used to make ____ and ____
ATP
NADPH
ATP or NADPH:
stores energy
ATP
ATP or NADPH:
carries electron
NADPH
2 types of Light Reactions, which comes first
Photosystem ll (First) Photosystem I (Second)
Which Photosystem deals makes NADPH
PSI
Which photosystem makes ATP
PSII
All plants use ____ to make glucose
C3 Pathway (Calvin Cycle)
Describe Carbon Reactions:
- Calvin Cycle assembles CO2 into glucse
1. Carbon Fixation
2. PGAL Synthesis
3. RUBP regenerated
Where does energy used to create PGAL come from?
Light Reactions (PSII and PSI)
ATP and NADPH from light reactions provide ______ _____ and _______
potential energy
electrons
ATP and NADPH used to reduce _____ to glucse
CO2
where do carbon reactions occur
in stroma
True/False: Carbon Reactions require light
FALSE
light = __________ ____________
independent reaction
Which part of photosynthesis s used to split water
PSII
Photorespiration is a problem….
in hot, dry, conditions
What is the name of the enzyme that combines RUBP sugar and CO2 and splits it in half
Rubisco
Photorespiration:
Rubisco uses _____ as a substrate (instead of ____) starting a process that removes already fixed Carbon
O2CO2
If stomata kept closed it prevents _____ loss, ____ builds up and photorespiration _____
water, O2, increases
what happens if you don’t water your plants?
everything shuts down
- don’t make ATP
- don’t make NADPH
- don’t make sugar/glucose
True/False: C4 plants use additional pathway
True
What does the additional pathway that C4 plants use do?
conserve H2O and CO2
absorbs photons of energy
Antana Pigments
2 antana pigments
Chlorophyll
Keratinoids
Chlorophyll:
absorbs:
reflects:
red and blue
green
Keratinoids:
absorbs:
reflects:
blue and green
orange and red
most abundant antana pigment
chlorophyll
photosynthesis pigment in plants, algae, and cyanobacteria
chlorophyll
only ______ light is photosynthetically active
absorbed
unit with chlorophyll A and other pigment molecules and proteins anchored in the thylakoid membrane
photosystem
excites electrons…chlorophyll A molecule that uses the light energy
Reaction Center
other pigments that capture energy and funnel it to reaction center
antenna pigments
phosphorylation adds P to ADP
Chemiostmotic Phosphorylation
movement of proton across membrane
chemiosmosis
Photosynthesis Equation:
What molecule substrate makes up organs mass of the plant
CO2 (air)
what is H2O main purpose in photosynthesis equation
provide proton and electron
