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Chapter 10 BIOL 101
Terms in this set (31)
Where do living organisms obtain organic compounds?
heterotrophs or autotrophs
-organic compounds from the environment
-consumers of the biosphere
-producers of the biosphere
what is photosynthesis?
light energy to chemical energy
equation for photosynthesis
6CO2 + 6H2O -----(light energy)---- C6H12O6 + 6O2
Why is Photosynthesis Important to Life on Earth?
-decreases CO2 in the atmosphere (lowers global temperature)
-adds O2 to the atmosphere
Some anaerobic bacteria use CO2 in photosynthesis, but do not release O2
CO2 + 2H2S → [CH2O] + H2O + 2S
Does this observation support or refute the idea that O2 in plant photosynthesis comes from CO2?
CB Van Niel proposed what reaction?
CO2 + 2H2X----CH2O + H20 + 2X
What is being oxidized and reduced in the equation for photosynthesis?
6CO2 + 6H2O + light energy → C6H12O6 + 6O2
What is being oxidized and reduced in the equation for cellular respiration?
C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
What is light?
-Travels in waves
-Disturbances of electric and magnetic fields
-Amount of energy inversely related to wavelength
-Discrete quantity of light that behaves like a particle
If a pigment molecule is least absorbed, it will...
reflect that color
how do plants absorb light energy?
-pigments called chlorophyll
What can pigments do?
pigments can increase the efficiency of photosynthesis and can protect from harmful wavelengths
A chlorophyll molecule contains a....
porphyrin ring and hydrocarbon tail
the porphyrin ring....
captures light energy
the hydrocarbon tail...
acts as an anchor
A new flower species has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are not being absorbed by this pigment?
red and yellow
Light energy captured and transformed into chemical energy
-ATP and NADPH
ATP and NADPH used to convert CO2 to glucose.
the _______ layer is where cells contain chlorophyll
the stomata is _____ regulated
(CO2 ____ and O2 ____)
the stomata is highly regulated
(CO2 in and O2 out)
the space around the thinakoid membrane is...?
-makes sugar in photosynthesis
If thylakoid is punctured so that the interior of the thylakoid is no longer separated from the stroma, this damage will have the most direct effect on which of the following processes?
the synthesis of ATP
Noncyclic electron flow and chemiosmosis in the chloroplast results in the production of:
ATP, O2 and NADPH
What happens when its hot and dry?
Plants close stomata to prevent water loss.
When its hot and dry, many plants...
prevent CO2 entry and O2 exit
Consequences when it is hot and dry....
C3 plants = photorespiration
Light energy is used to fix O2 instead of CO2
No ATP generated
No carbohydrates produced
CO2 concentrated in bundle sheath cells
Stomata open only at night to let CO2 into cells
Leaf anatomy in C4 plants
Spatial separation of carbon fixation and Calvin cycle
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