BIOL 1P91 Prep Test Questions
Answered Correctly | LATEST
UPDATE
2 reactions that make up photosynthesis - ANSWER Light
reactions
Calvin cycle
light reaction - ANSWER - Uses light energy
- Occurs in the thylakoid membrane
- Produces ATP, NADPH and O2
Calvin Cycle - ANSWER - Occurs in stroma
- Uses ATP and NADPH to incorporate CO2 into carbohydrate
Equation for photosynthesis - ANSWER 6CO2 + 6H2O + light
energy = C6H12O6 + 6O2
Where CO2 is reduced and H2O is oxidized
Photosynthesis powers the ______ - ANSWER biosphere
The 3 types of organisms that can sustain life - ANSWER
Heterotroph, Autotroph, Photoautotroph
Heterotroph - ANSWER An organism that cannot make its own
food; a consumer
Autotroph - ANSWER An organism that makes its own food
(producer)
Photoautotroph - ANSWER Creates energy from sunlight for
itself. (Photosynthesis)
Where does photosynthesis occur - ANSWER chloroplasts
(plant cells)
Where does the majority of photosynthesis occur - ANSWER In
the leaves, the mesophyll
In photosynthesis, where does CO2 enter and O2 exit -
ANSWER Stomata
Plant membrane containing pigment molecules - ANSWER
Thylakoid membranes
granum (grana) - ANSWER stack of thylakoids inside the
chloroplast
What is the fluid-filled region between the thylakoid membrane
and the inner membrane? - ANSWER stroma
What are the 3 membranes in a plant? - ANSWER Outer
membrane, inner membrane, thylakoid membrane
Why are leaves green? - ANSWER Chlorophyll molecules
mainly absorb light in the blue-violet and red-orange part of the
electromagnetic spectrum. Chlorophyll does not absorb much
green light, which is reflected to our eyes.
What happens to an electron after it absorbs energy? -
ANSWER It's put into an excited state and is usually unstable,
and can be transferred to another molecule
photosystem II (PS II) - ANSWER 1st step in photosynthesis
Splits water, creating O2 and H+
Excited electrons are created and enter an ETC
Has a P680 pigment molecule that absorbs light energy and
transfers it to electrons, exciting them
Photosystem I - ANSWER Primary role is to make NADPH
Has a P700 pigment molecule that absorbs light energy and
transfers it to electrons, exciting them
Excited electrons are transferred to a primary electron acceptor,
and eventually reduce NADP+ to NADPH
Electron journey in PSI - ANSWER 2 high-energy electrons --->
primary electron acceptor ---> Ferrodoxin ---> NADP+ reductase -
--> NADP+ ---> NADPH
How is ATP synthesis in chloroplasts achieved - ANSWER By a
chemiosmotic mecha
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