05 17

Photosynthesis multiple choice questions doc


The light reaction of photosynthesis does not include
A) chemiosmosis
B) oxygen liberation
C) charge separation
D) electron transport


The final product of the Calvin cycle is
D) G3P


Photosynthesis takes place in the membranes of small sacs called
A) thylakoids
B) grana
C) photosystems
D) photons


The dark reaction in photosynthesis is limited by
A) CO2, temperature, and light
B) CO2, light, and water
C) water, temperature, and CO2
D) oxygen, water, and temperature


Colors of light most useful in photosynthesis are
A) green, yellow, and orange
B) red, violet, and blue
C) infrared, red, and yellow
D) red, white, and blue


During what stage of photosynthesis is O2 produced?
A) cyclic photophosphorylation
B) the light-dependent reactions involving photosystems I and II
C) carbon fixation
D) the Krebs cycle
E) O2 is not produced during photosynthesis


The pigment molecules responsible for photosynthesis are located in the
A) mitochondria
B) cytoplasm of the cell
C) stroma of the chloroplast
D) thylakoid membrane of the chloroplast
E) all of the above


Both carotenoids and chlorophylls
A) are pigments
B) absorb photons of all energy ranges
C) contain porphyrin rings
D) all of the above
E) none of the above


Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?
A) P680 à P700 à water à NADP+
B) water à P700 à NADP+à P680
C) P700 à P680 à NADP+à water
D) P680 à water à P700 à NADP+
E) water à P680 à P700 à NADP+


What pigment is used in human vision?
A) chlorophyll a
B) beta-carotene
C) retinal
D) vitamin A
E) ferredoxin


During what stage of photosynthesis are ATP and NADPH converted to ADP + Pi and NADP+?
A) the light-dependent reactions
B) the light-independent reactions
C) both of the above
D) none of the above


Water vapor exits and CO2 enters a leaf through the
A) stomata
B) grana
C) porphyrin rings
D) photons
E) stroma


Which of the following organisms have the greatest problem with photorespiration?
A) C4 plants
B) heterotrophs
C) C3 plants
D) CAM plants
E) purple sulfur bacteria


What energy-rich organic compound is produced as a result of the Calvin cycle?
B) CO2
D) H2O
E) glucose


High-energy photons
A) have long wavelengths
B) have short wavelengths
C) are more likely to produce red light than blue light
D) cannot be absorbed


Light that is visible to humans occupies what part of the electromagnetic spectrum?
A) the entire upper half
B) the entire lower half
C) a small portion in the middle
D) the entire spectrum
E) visible light is not part of the electromagnetic spectrum


During photosynthesis, photons raise electrons to higher energy levels. These excited electrons belong to what compound?
A) H2O
D) glucose
E) chlorophyll


Which of the following occurs during the light-dependent reactions of plants?
A) electron transport
B) chemiosmosis
C) splitting of water
D) all of the above
E) none of the above


The oxygen that is released as O2 during photosynthesis came from _____________ molecules.
A) carbon dioxide
B) water
C) glucose
D) chlorophyll


Compared to retinal, chlorophyll can be described as a pigment that has a
A) narrow absorption range but high efficiency
B) narrow absorption range but low efficiency
C) wide absorption range but high efficiency
D) wide absorption range but low efficiency


The earliest photosynthesizers probably used what as a source of hydrogen?
A) H2S
B) H2O
C) CO2
D) C6H12O6


How many carbon atoms are in a molecule of RuBP?
A) zero
B) one
C) two
D) three
E) five


Which of the following is mismatched?
A) Photosystem I - uses the P700 molecule in its photocenter
B) PGA - a 3-carbon compound
C) antenna complex - contains hundreds of pigment molecules
D) CAM plants - open their stomata during the day and close them at night to avoid photorespiration
E) C4 plants - expend ATP to concentrate CO2 in bundle-sheath cells to avoid photorespiration


Which of the following statements about photosynthesis is true?
A) the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark
B) photorespiration is more efficient at producing glucose than is photosynthesis
C) the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions
D) all of the above are true


Which of the following statements accurately describes the relationship between photosynthesis and cellular respiration?
A) photosynthesis occurs only in autotrophs; cellular respiration occurs only in heterotrophs
B) photosynthesis uses solar energy to convert inorganics to energy-rich organics; respiration breaks down energy-rich organics to synthesize ATP
C) photosynthesis involves the oxidation of glucose; respiration involves the reduction of CO2
D) the primary function of photosynthesis is to use solar energy to synthesize ATP; the primary function of cellular respiration is to break down ATP and release energy
E) photosynthesis and cellular respiration occur in separate, specialized organelles; the two processes cannot occur in the same cell at the same time


In sulfur bacteria, how many pigment electrons must get transported during cyclic photophosphorylation to produce one molecule of ATP?
A) one
B) two
C) three
D) four
E) five


Production of one molecule of 3-phosphoglyceraldehyde requires how many turns of the Calvin cycle?
A) 1
B) 2
C) 3
D) 6
E) 12


To reduce six molecules of carbon dioxide to glucose via photosynthesis, how many molecules of NADPH and ATP are required?
A) 6 NADPH and 6 ATP
B) 12 NADPH and 12 ATP
C) 12 NADPH and 18 ATP
D) 18 NADPH and 12 ATP
E) 24 NADPH and 18 ATP


The primary form of sugar transported from the site of photosynthesis to the rest of the plant is:
A) glyceraldehyde 3-phosphate
B) glucose
C) fructose
D) ribulose 1,5-bisphosphate
E) sucrose


A) catalyzes the carboxylation of CO2 to ribulose 1,5-bisphosphate.
B) initiates photorespiration when the CO2/O2 ratio is low.
C) catalyzes the reduction of two molecules of PGAL to form glucose.
D) all of the above (a-c).
E) a and b, but not c.


The immediate products of C3 and C4 photosynthesis are, respectfully:
A) ribulose 1,5-bisphosphate; malic acid
B) malate; carbon dioxide
C) 3-phosphoglycerate; oxaloacetic acid
D) glyceraldehyde 3-phosphate; phospho-enol-pyruvate (PEP)
E) malic acid; glucose


Light-driven electron transport in the chloroplast pumps H+ into the intermembrane space between the outer and inner membranes.
A) True
B) False


CO2 fixation occurs within the stroma.
A) True
B) False


If you know the absorption spectrum of a pigment, you can predict the pigment's color.
A) True
B) False


For every CO2 molecule fixed by photosynthesis, one molecule of O2 is produced.
A) True
B) False


Light is required for the light dependent reactions because
A) it is the source for electrons
B) it splits the water molecule
C) it energizes electrons in the reaction center
D) it splits ATP molecules which generates the energy necessary to power the light independent reactions
E) none of the above

Choice Quiz Multiple Biology |


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