PCB 3023 UCF Exam 3 | UPDATED Questions with 100% Verified
Answers
Question:
Which of these processes require a membrane? Choose one
or more:
A) generation of ATP by photosynthesis in plants
B) generation of ATP by photosynthesis in bacteria
C) generation of energy by mitochondria
D) generation of ATP by oxidative phosphorylation
E) generation of ATP by glycolysis
Answer:
A) generation of ATP by photosynthesis in plants
B) generation of ATP by photosynthesis in bacteria
C) generation of energy by mitochondria
D) generation of ATP by oxidative phosphorylation
Question:
In the electron-transport chain, as electrons move along a
series of carriers, they release energy that is used to do what?
Choose one:
A) phosphorylate ADP to form ATP
B) hydrolyze ATP
C) oxidize food molecules
D) split water into protons and oxygen
E) pump protons across a membrane
Answer:
E) pump protons across a membrane
Question:
Now, where do you find an electron to give to the original
low-energy electron donor (the first one in the row)?
A. take a low energy electron from water
B. take a high energy electron from water
,C. take a low energy electron from NADPH
D. take a high energy electron from NADPH
E. return the high energy electron from reduced acceptor
Answer:
A. take a low energy electron from water
Question:
In the light reactions of photosynthesis, a proton gradient is
generated which drives ATP synthesis. Where do protons
become concentrated in the chloroplast?
A. stroma
B. thylakoid space
C. inner membrane
D. thylakoid membrane
E. cytosol
Answer:
B. thylakoid space
Question:
Which of the following statements is true?
A. The light-independent reactions of photosynthesis occur
only in the absence of light.
B. Each round of the Calvin cycle uses five molecules of
CO2 to produce one molecule of glyceraldehyde 3-
phosphate and one of pyruvate.
C. Ribulose 1,5-bisphosphate is similar to oxaloacetate in the
Citric acid cycle in that they are both regenerated at the end
of their respective cycles.
Answer:
C. Ribulose 1,5-bisphosphate is similar to oxaloacetate in the Citric acid cycle in that they
are both regenerated at the end of their respective cycles.
Question:
,Which could be the activated intermediate in the dehydration
synthesis forming a phosphodiester bond?
A. P,
B. AMP
C. ADP
D. ATP
Answer:
D. ATP
Question:
Figure 14–38 illustrates the pathway of electron flow in
photosynthesis. In an alternative pathway of photosynthesis,
called cyclic photophosphorylation, electrons from
photosystem I are passed to ferredoxin and are then
transferred back to plastoquinone. Which of the following
would be expected to result from cyclic
photophosphorylation?
A. Electrons from cyclic photophosphorylation will be
returned to the reaction center chlorophyll molecules of
photosystem II, preventing the need to split water and
reducing the production of molecular oxygen.
B. Electrons from cyclic photophosphorylation will be used
to pump protons into the thylakoid lumen, leading to
production of additional ATP.
C. Electrons from cyclic photophosphorylation will be used
to reduce NADP+ to NADPH.
D. Cyclic photophosphorylation will require the splitting of
additional water molecules, resulting in the production of
more molecular oxygen.
Answer:
B. Electrons from cyclic photophosphorylation will be used to pump protons into the
thylakoid lumen, leading to production of additional ATP.
, Question:
What is true of the organelles that produce ATP in eukaryotic
animal cells?Choose one:
A) They evolved from bacteria engulfed by ancestral cells
billions of years ago.
B) They reproduce sexually.They harbor eukaryotic-like
biosynthetic machinery for making RNA and protein.
C) They contain the same genes as the chloroplasts of plant
cells.
D) They have a separate set of DNA that contains many of
the same genes found in the nucleus.
Answer:
A) They evolved from bacteria engulfed by ancestral cells billions of years ago.
Question:
In additions to chlorophylls, chloroplasts also contain
accessory pigments. These pigments help to capture light of
wavelengths not readily captured by chlorophylls. In addition,
some pigments are also anti-oxidant molecules and protect
the photosystems from oxidative damage caused by high
intensity light. Using the chlorophyll a absorbance spectrum
shown in Figure 14–31, determine which of the following
pigments has an absorbance that MOST overlaps with the
absorbance of chlorophyll a?Figure 14–31 Choose one:
A. Oenin (an anthocyanin pigment): peak absorbance range
~450–550 nm
B. Phycoerythrin (a phycobilin pigment): peak absorbance
range ~500–575 nm
C. β-Carotene (a carotenoid pigment): peak absorbance
Answers
Question:
Which of these processes require a membrane? Choose one
or more:
A) generation of ATP by photosynthesis in plants
B) generation of ATP by photosynthesis in bacteria
C) generation of energy by mitochondria
D) generation of ATP by oxidative phosphorylation
E) generation of ATP by glycolysis
Answer:
A) generation of ATP by photosynthesis in plants
B) generation of ATP by photosynthesis in bacteria
C) generation of energy by mitochondria
D) generation of ATP by oxidative phosphorylation
Question:
In the electron-transport chain, as electrons move along a
series of carriers, they release energy that is used to do what?
Choose one:
A) phosphorylate ADP to form ATP
B) hydrolyze ATP
C) oxidize food molecules
D) split water into protons and oxygen
E) pump protons across a membrane
Answer:
E) pump protons across a membrane
Question:
Now, where do you find an electron to give to the original
low-energy electron donor (the first one in the row)?
A. take a low energy electron from water
B. take a high energy electron from water
,C. take a low energy electron from NADPH
D. take a high energy electron from NADPH
E. return the high energy electron from reduced acceptor
Answer:
A. take a low energy electron from water
Question:
In the light reactions of photosynthesis, a proton gradient is
generated which drives ATP synthesis. Where do protons
become concentrated in the chloroplast?
A. stroma
B. thylakoid space
C. inner membrane
D. thylakoid membrane
E. cytosol
Answer:
B. thylakoid space
Question:
Which of the following statements is true?
A. The light-independent reactions of photosynthesis occur
only in the absence of light.
B. Each round of the Calvin cycle uses five molecules of
CO2 to produce one molecule of glyceraldehyde 3-
phosphate and one of pyruvate.
C. Ribulose 1,5-bisphosphate is similar to oxaloacetate in the
Citric acid cycle in that they are both regenerated at the end
of their respective cycles.
Answer:
C. Ribulose 1,5-bisphosphate is similar to oxaloacetate in the Citric acid cycle in that they
are both regenerated at the end of their respective cycles.
Question:
,Which could be the activated intermediate in the dehydration
synthesis forming a phosphodiester bond?
A. P,
B. AMP
C. ADP
D. ATP
Answer:
D. ATP
Question:
Figure 14–38 illustrates the pathway of electron flow in
photosynthesis. In an alternative pathway of photosynthesis,
called cyclic photophosphorylation, electrons from
photosystem I are passed to ferredoxin and are then
transferred back to plastoquinone. Which of the following
would be expected to result from cyclic
photophosphorylation?
A. Electrons from cyclic photophosphorylation will be
returned to the reaction center chlorophyll molecules of
photosystem II, preventing the need to split water and
reducing the production of molecular oxygen.
B. Electrons from cyclic photophosphorylation will be used
to pump protons into the thylakoid lumen, leading to
production of additional ATP.
C. Electrons from cyclic photophosphorylation will be used
to reduce NADP+ to NADPH.
D. Cyclic photophosphorylation will require the splitting of
additional water molecules, resulting in the production of
more molecular oxygen.
Answer:
B. Electrons from cyclic photophosphorylation will be used to pump protons into the
thylakoid lumen, leading to production of additional ATP.
, Question:
What is true of the organelles that produce ATP in eukaryotic
animal cells?Choose one:
A) They evolved from bacteria engulfed by ancestral cells
billions of years ago.
B) They reproduce sexually.They harbor eukaryotic-like
biosynthetic machinery for making RNA and protein.
C) They contain the same genes as the chloroplasts of plant
cells.
D) They have a separate set of DNA that contains many of
the same genes found in the nucleus.
Answer:
A) They evolved from bacteria engulfed by ancestral cells billions of years ago.
Question:
In additions to chlorophylls, chloroplasts also contain
accessory pigments. These pigments help to capture light of
wavelengths not readily captured by chlorophylls. In addition,
some pigments are also anti-oxidant molecules and protect
the photosystems from oxidative damage caused by high
intensity light. Using the chlorophyll a absorbance spectrum
shown in Figure 14–31, determine which of the following
pigments has an absorbance that MOST overlaps with the
absorbance of chlorophyll a?Figure 14–31 Choose one:
A. Oenin (an anthocyanin pigment): peak absorbance range
~450–550 nm
B. Phycoerythrin (a phycobilin pigment): peak absorbance
range ~500–575 nm
C. β-Carotene (a carotenoid pigment): peak absorbance
