Approximately how many light harvesting chromophores ar found per photosystem enzyme, such as in PSI and PSII?
A. 2
B. About a dozen
C. About 100 to 200
D. About 1000 to 2000 correct answers C. About 100 to 200
All of the following are true of both chloroplasts and mitochondria EXCEPT that t...
approximately how many light harvesting chromophor
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BIOC 385 Final Exam || with Error-free Solutions.
Approximately how many light harvesting chromophores ar found per photosystem enzyme,
such as in PSI and PSII?
A. 2
B. About a dozen
C. About 100 to 200
D. About 1000 to 2000 correct answers C. About 100 to 200
All of the following are true of both chloroplasts and mitochondria EXCEPT that they
A. have one highly folded membrane
B. Produce ATP inside the organelle
C. Produce NADPH inside the organelle
D. Are present in photosynthetic plant cells correct answers C. Produce NADPH inside the
organelle
The chloroplast contains a highly folded membrane called the
A. Thlyakoid
B. Lumen
C. Inner membrane
D. Matrix correct answers A. Thylakoid
On excitation by a photon, the fate of the excited chlorophyll molecule is to
A. Transfer an electron to an acceptor molecule
B. Transfer an electron to ATP
C. Relax and release a proton to a neighboring chlorophyll
D. Relax and accept an electron from a nearby donor correct answers A. Transfer an electron to
an acceptor molecule
The following picture is an example of what phenomenon?
A. Resonance energy transfer
B. Electron transfer
C. Photoexcitation
D. Fluorescence correct answers A. Resonance energy transfer
The photosynthetic Z scheme describes the
A. Synthesis of glucose from CO2
B. Movement of electrons driven by the absorption of light energy
C. production of O2
D. Reduction of NADPH correct answers B. Movement of electrons driven by absorption of light
energy
What group in photosystem II (PSII) directly reacts with H2O during its light-driven oxidation?
A. Oxygen evolving center
B. P680
C. Tyrosine
,D. Pheophytin correct answers A. Oxygen evolving center
What is NOT a correct analogy between the photosynthetic PQ cycle and the mitochondrial
electron transport chain Q cycle?
A. Plastocyanin is analogous is cytochrome C
B. Pastoquinone is analogous to coenzyme Q
C. Cytochrome b6f is analagous to Complex III
D. Photosystem I is analogous to Complex I correct answers D. Photosystem I is analogous to
Complex I
In addition to the pumping of protons with the photosynthetic electron transport, what else
contributes to establishing a proton gradient?
A. The loss of electrons form NADPH
B. The reduction of P680+
C. The movement of plastocyanin
D. The formation of O2 from 2 H2O correct answers D. The formation of O2 to 2 H2O
The herbicide paraquat operates by stealing electrons from photosystem I (PSI). Which of the
following is true of chloroplasts treated with paraquat?
A. NAPDH levels drop
B. Photosystem II is not re-reduced
C. Plastocyanin has nowhere to donate electrons
D. No protons are pumped across the chloroplast membranes correct answers A. NADPH levels
drop
Per O2 molecule generated in photosynthetic light reactions, approximately how many protons
are moved across the thylakoid membrane?
A. 3
B. 4
C. 8
D. 12 correct answers D. 12
Approximately how many ATP are synthesized per O2 molecule generated in photosynthesis
light reactions?
A. 3
B. 4
C. 8
D. 12 correct answers A. 3
Which protein or enzyme is NOT involved in the cyclic photophosphorylation pathways?
A. Ferredoxin
B. Photosystem II
C. Cytochrome b6f
D. Plastocyanin correct answers B. Photosystem II
,In the chloroplasts, photosystem I (PSI) and photosystem II (PSII) are known to localize in
different regions. Photosystem I generally localizes in the __________, whereas photosystem II
generally localizes in the __________.
A. Thylakoid lumen; thylakoid grana
B. Thylakoid lamellae; thylakoid grana
C. Stroma; thylakoid lumen
D. Thylakoid grana; thylakoid lamellae correct answers B. Thylakoid lamellae; thylakoid grana
Why are Calvin cycle reactions also referred to as the dark reactions?
A. They occur primarily at night
B. They absorb, and do not reflect, the sunlight energy
C. They do not absorb sunlight energy
D. They do not require sunlight energy correct answers C. They do not absorb sunlight energy
Which of the following is true of stage 2 of the Calvin Cycle?
A. Stage 2 involves the net incorporation of CO2 into the 6 carbon glucose molecule
B. Almost all of the NADPH and ATP from the light reactions are used in Stage 2
C. Stage 2 reactions are localized on the thylakoid membrane of the chloroplasts
D. C3, C4, C5,and C6 sugars are all involved in stage 2 reactions correct answers B. Almost all
of the NADPH and ATP from the light reactions are used in Stage 2
C4 plants are thought to be more effiicient than C3 plants because they
A. Make larger sugar molecules from CO2
B. Can concentrate the CO2 in chloroplasts and therefore minimize side reactions with O2
C. Can produce sugar molecules at night in addition to during the day
D. Can live in dry climates correct answers B. Can concentrate the CO2 in chloroplasts and
therefore minimize side reactions with O2
Which cell type in C4 plants is isolated from O2 exposure as they perform Calvin cycle
reactions?
A. Hatch-Slack cells
B. Bundle sheath cells
C. Guard cells
D. Mesophyll cells correct answers B. Bundle sheath cells
The glyoxylate cycle reaction shown below is catalyzed by which enzyme class?
A. Lyase
B. Hydrolase
C. Transferase
D. Oxidoreductase correct answers A. Lyase
The glyoxylate cycle enzymes
A. Are active at night when sugar reserves are high and lipid synthesis is activated
B. Bypass the decarboxylation steps of the TCA cycle, resulting in the net synthesis of a sugar
molecule from acetyl-CoA
C. Replace the mitochondrial TCA cycle enzymes
, D. Require ATP and NADPH from the light reactions correct answers B. Bypass the
decarboxylation steps of the TCA cycle, resulting in the net synthesis of a sugar molecule from
acetyl-CoA
Which glucose homopolymer would be used if a person had to sprint quickly?
A. Sucrose
B. Galactose
C. Starch
D. Glycogen correct answers D. Glycogen
Glycoconjugates are linked to proteins or lipids via
A. London forces
B. Ionic bonds
C. Covalent bonds
D. Hydrogen bonds correct answers C. Covalent bonds
The growth rate of nonruminating animals often decreases when they eat feed containing
_______ because of the inability to digest it.
A. Glucose
B. Lactose
C. Starch
D. Raffinose correct answers D. Raffinose
How are glycosaminoglycans attached to proteins?
A. London forces
B. Ionic bonds
C. Covalent bonds
D. Hydrogen bonds correct answers C. Covalent bonds
Compared with amylopectin, amylose has ______ glycosidic bonds.
A. More alpha-1,6
B. Fewer alpha-1,6
C. Only alpha-1,4
D. Only alpha-1,6 correct answers C. Only alpha-1,4
If one homozygous parents expresses the GTA glycosyltransferase and the other homozygous
parent expresses the GTP glyosyltransferase, what is the probability of a child with blood type of
O?
A. 0%
B. 25%
C. 75%
D. 100% correct answers B. 25%
Compared with Gram-negative bacteria, Gram-positive bacteria have a
A. Thicker peptidoglycan layer
B. Thinner peptidoglycan layer
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