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bio test 2
chapter 9
32
Biology
Undergraduate 1
02/28/2012

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Term
What is photosynthesis?
Definition
Conversion of light energy to chemical energy in the form of sugar and other organic molecules
Term
What is the difference between producers and consumers?
Definition
Producers make their own food, consumers eat plants or other animals
Term
Autotrophs
Definition
– organisms that make required organic molecules
Term
Heterotrophs
Definition
– consumers and decomposers need a source of organic molecules to survive
Term
What are the two stages of photosynthesis?
Definition
light – dependent reactions
light – independent reactions (Calvin cycle)
Term
What is carbon dioxide fixation?
Definition
A reduction reaction in which electrons and proton (H+) are added to CO_2
Term
During carbon dioxide fixation process, what is being made?
Definition
glucose
Term
During carbon fixation, where do the electrons come from?
Definition
water
Term
What is the chemical equation for photosynthesis?
Definition
6 CO_2 + 6 H_2 O ---- C_6 H_12 O_6 + 6 O_2
Term
Where does photosynthesis take place in?
Definition
chroloplasts
Term
The fluid found within photosynthesis is called the
Definition
stroma
Term
Within the fluid are flattened sacs called
Definition
thylakoids
Term
Where do the light reactions occur?
Definition
Thylakoids membrane
Term
Where does the Calvin cycle occur?
Definition
stomata
Term
Basically, what happens during the light reaction?
Definition
Convert light energy to chemical energy
Term
What are the two steps of light reactions?
Definition
1. light absorption
2. synthesis of nadph and atp
Term
What is visible light?
Definition
Form of radiant energy that makes up a small part of the electromagnetic spectrum
Term
Energy in a unit of light is called
Definition
photon
Term
In photosynthesis, light is absorbed by ? and ?
Definition
chlorophylls, carotenoids
Term
Why are plants green?
Definition
Chlorophyll absorbs blue and red light, and transmits or reflects green light
Term
What are photosystems?
Definition
The sites at which light energy is converted into chemical energy
Term
Each photosystem is made up of
Definition
Antenna complex and Reaction center
Term
Antenna complex
Definition
– capture of light energy
Term
Reaction center
Definition
– contains a pair of specialized chlorophyll a molecules that hold the electrons to be excited
Term
Basically, what is happening during the Calvin cycle?
Definition
to produce sugar
Term
What are the three phases of Calvin cycle?
Definition
1. phase 1; carbon fixation
2. phase 2; reduction
3. phase 3; regeneration
Term
How many turns does it take to make one glucose during the Calvin cycle?
Definition
Six turns
Term
What causes photorespiration?
Definition
When rubisco binds to O_2 instead of CO_2
Term
Why is photorespiration bad for the plant?
Definition
Sugar will not be produced
Term
What are the two alternative processes that
minimize the effects of photorespiration by using alternative processes of carbon fixation.
Definition
C_4 pathway
CAM (crassulacean acid metabolism)
Term
C_4 pathway
Definition
- Calvin cycle occurs in the bundle sheath cells where there is no O_2
Term
CAM (crassulacean acid metabolism)
Definition
– carbon fixation and the Calvin cycle both accur in mesophyll cells, but run at different times
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