Module 5- Photosynthesis Flashcards
what is the reversible reaction for photosynthesis/respiration?
6CO2 + 6H2O → C6H12O6 + 6O2
explain the interrelationship between photosynthesis and respiration in organisms?
what are the 8 components of the chloroplast?
outer+inner membrane, lamellae, grana, thylakoid, stroma, DNA, starch granule
how is grana identified on a micrograph?
it appears darker as it is stacked thylakoid membrane
what is the primary pigment for photosynthesis?
chlorophyll a
how are the photosynthetic pigments arranged?
in photosystems
in what type of organisms does photosynthesis occur?
autotrophic
what membrane structure does a chloroplast have?
double membrane
what fluid is a chloroplast filled with?
stroma
what is the purpose of the accessory pigments?
to absorb different (a range) wavelengths of light to allow more energy from light to be passed to electrons
what are the accessory pigments?
carotenoids, chlorophyll B
what are the two carotenoids?
xanthophyll and beta carotene
PAG- why do you have to make sure the dot dries before re applying?
to make it more concentrated
PAG- what are some precautions that should be taken during chromatography?
what are the two differences between non-cyclic phosphorylation and cyclic phosphorylation?
-Cyclic photophosphorylation only involves photosystem I (whereas non-cyclic photophosphorylation involves photosystems I and II)
-Cyclic photophosphorylation does not produce reduced NADP (whereas non-cyclic photophosphorylation does)
where are the photosynthetic pigments found?
photosystems in the thylakoid membrane
what wavelength of light does β carotene absorb?
orange
what wavelength of light does xanthophyll absorb?
yellow
what wavelength of light does Chlorophyll a absorb?
blue-green
what wavelength of light does Chlorophyll b absorb?
yellow-green
what light do chlorophylls reflect?
green
where does the light-dependent stage of photosynthesis take place?
in the thylakoid
where does the light-independent stage take place?
in the stroma
what happens during the light dependent stage of photosynthesis?
Reduced NADP is produced when hydrogen ions combine with the carrier molecule NADP using electrons from the photolysis of water
ATP is produced from ADP and Pi by ATP synthase in a process called photophosphorylation (ADP + Pi → ATP)
Photophosphorylation uses the proton (H+) gradient generated by the photolysis of water
Energy from ATP and hydrogen from reduced NADP are passed from the light-dependent stage to the light-independent stage of photosynthesis
what is NADP?
acts as final electron acceptor & is reduced
what are the 3 limiting factors of photosynthesis?
Light intensity
Carbon dioxide concentration
Temperature
what is a limiting factor?
the factor that will limit the rate of photosynthesis increasing
what is the photolysis of water?
2H2O → O2 + 4e- + 4H+
what is the first electron donor in cyclic phosphorylation?
photosystem 1
what is the last electron donor in cyclic phosphorylation?
photosystem 1
what is the last electron donor in non-cyclic phosphorylation?
NADP
what is the first electron donor in non-cyclic phosphorylation?
water
why isn’t water a limiting factor?
water shortages usually affect other processes before affecting photosynthesis therefore isn’t one of the main limiting factors
why does the rate of photosynthesis increase if temperature increases?
the reaction is controlled by enzymes
