Chapter 8-Photosynthesis Flashcards
The final product of the Calvin Cycle is
G3P
Photosynthesis takes place in the membranes of small sacs called
Thylakoids
The dark reaction in photosynthesis is limited by
CO2, temperature, and light
During what stage of photosynthesis is O2(Oxygen) produced?
The light dependent reactions involving photosystem I and II
Colors of light most useful in photosynthesis are
Red, violet, and blue
The pigment molecules responsible for photosynthesis are located in the
Thylakoid membrane of the chloroplast
Both carotenoids and chlorophylls
Are pigments.
The light reaction of photosynthesis does not include
Oxygen Liberation
Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?
water à P680 à P700 à NADP+
What pigment is used in human vision?
retinal
During what stage of photosynthesis are ATP and NADPH converted to ADP + Pi and NADP+?
the light-independent reactions
Water vapor exits and CO2 enters a leaf through the
stomata
Which of the following organisms have the greatest problem with photorespiration?
C3 Plants
What energy-rich organic compound is produced as a result of the Calvin cycle?
glucose
High-energy photons
have short wavelengths
Light that is visible to humans occupies what part of the electromagnetic spectrum?
a small portion in the middle
During photosynthesis, photons raise electrons to higher energy levels. These excited electrons belong to what compound?
chlorophyll
Which of the following occurs during the light-dependent reactions of plants?
electron transport, chemiosmosis, splitting of water
Compared to retinal, chlorophyll can be described as a pigment that has a
narrow absorption range but high efficiency
The earliest photosynthesizers probably used what as a source of hydrogen?
H2S
How many carbon atoms are in a molecule of RuBP?
five
The oxygen that is released as O2 during photosynthesis came from _____________ molecules.
water
Which of the following is mismatched?
CAM plants - open their stomata during the day and close them at night to avoid photorespiration
Which of the following statements about photosynthesis is true?
the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions
Which of the following statements accurately describes the relationship between photosynthesis and cellular respiration?
photosynthesis uses solar energy to convert inorganics to energy-rich organics; respiration breaks down energy-rich organics to synthesize ATP
In sulfur bacteria, how many pigment electrons must get transported during cyclic photophosphorylation to produce one molecule of ATP?
three
Production of one molecule of 3-phosphoglyceraldehyde requires how many turns of the Calvin cycle?
3
To reduce six molecules of carbon dioxide to glucose via photosynthesis, how many molecules of NADPH and ATP are required?
12 NADPH and 18 ATP
The primary form of sugar transported from the site of photosynthesis to the rest of the plant is:
sucrose
Rubisco:
catalyzes the carboxylation of CO2 to ribulose 1,5-bisphosphate.
and initiates photorespiration when the CO2/O2 ratio is low.
The immediate products of C3 and C4 photosynthesis are, respectfully:
3-phosphoglycerate; oxaloacetic acid
Light-driven electron transport in the chloroplast pumps H+ into the intermembrane space between the outer and inner membranes.
(true or false)
FALSE
CO2 fixation occurs within the storm.
false or true
TRUE
If you know the absorption spectrum of a pigment, you can predict the pigment’s color.
(true or false)
TRUE.
For every CO2 molecule fixed by photosynthesis, one molecule of O2 is produced.
(true or false)
TRUE
Light is required for the light dependent reactions because
it energizes electrons in the reaction center
