Biochemistry 385 - Final Exam
questions and answers graded A+
passed
The term greenhouse effect refers to the idea that - correct answer ✔✔the temperature of the
earth is increasing because of heat trapped by gases such as CO2.
In the five steps used by photosynthetic organisms to convert solar energy into chemical energy,
which molecules store the solar energy before sugar synthesis? - correct answer ✔✔ATP and
NADPH
All of the following are true of both chloroplasts and mitochondria EXCEPT that they - correct
answer ✔✔produce NADPH inside the organelle
What is the overall balanced reaction for the light reactions of photosynthesis? - correct answer
✔✔2 H2O + 8 photons + 2 NADP+ + 3 ADP + 3 Pi --> O2 + 2 NADPH + 3 ATP
Which of the following is a photosynthetic light harvesting pigment? - correct answer ✔✔beta-
carotene
Resonance energy transfer from one chlorophyll in the photosystems results in - correct answer
✔✔a neighboring chlorophyll in an excited state
Which of the following is an electron transfer molecule in photosynthesis light reactions? -
correct answer ✔✔plastoquinone
The energy derived from photosynthesis and used to make ATP is manifested in what form? -
correct answer ✔✔an acidic thylakoid lumen
,Under what conditions does cyclic photophosphorylation take place? - correct answer ✔✔with
high levels of NADPH
In the chloroplasts, photosystem I (PSI) and photosystem II (PSII) are known to localize in
different regions. PSI generally localizes in the ____, whereas PSII localizes in the ____ - correct
answer ✔✔thylakoid lamellae; thylakoid grana
The third stage of the three-stage Calvin cycle - correct answer ✔✔regenerates a C5 sugar for
the Calvin cycle to continue
Overall, the net balanced reaction of the Calvin cycle converts 3 CO2 into one - correct answer
✔✔glyceraldehyde-3-phosphate
What is the name of the enzyme that catalyzes the reaction shown below? - correct answer
✔✔ribulose bisphosphate carboxylase
The five-step mechanism of ribulose bisphosphate carboxylase (rubisco) - correct answer
✔✔adds a CO2 molecule to a C5 ribulose sugar, yielding an unstable C6 molecule that cleaves
into two C3 molecules
Which of the following groups of molecules are found in the shuffling reactions of stage 3 of
photosynthesis? - correct answer ✔✔erythrose-4-phosphate, glyceraldehyde-3-phosphate, and
xylulose-5-phosphate
Under what condition(s) do the wasteful side reaction of O2 with rubisco become significant? -
correct answer ✔✔increased temperature and intense light
The glyoxylate cycle enzymes - correct answer ✔✔bypass the decarboxylation steps of the TCA
cycle, resulting in the net synthesis of a sugar molecule from acetyl-CoA
, Which of the following is classified as a monosaccharide? - correct answer ✔✔glucose
Glycoconjugates are linked to proteins or lipids via - correct answer ✔✔covalent bonds
The following figure shows the cellular processes that synthesize, secrete, and recognize
glycoconjugates in eukaryotic cells. Identify the cell surface glycoconjugates. - correct answer
✔✔5
Raffinose-series oligosaccharides are hard for humans to digest because - correct answer
✔✔humans do not have the enzyme necessary to hydrolyze the glycosidic bonds
The product Beano contains ____, which helps humans digest raffinose-series oligosaccharides.
- correct answer ✔✔alpha-galactosidase
The growth rate of nonruminating animals often decreases when they eat feed containing ____
because of the inability to digest it. - correct answer ✔✔raffinose
What type of bond is responsible for the rigid nature of the polysaccharide fibril structure? -
correct answer ✔✔hydrogen bonds
Amylose can form stable left-handed helical structures because of - correct answer
✔✔hydrogen bonds
Which glycan contains a covalently linked dimeric protein that functions as a protein anchor? -
correct answer ✔✔glycogen
A person who only expresses the GTB enzyme and not the GTA enzyme will have which blood
type? - correct answer ✔✔B
questions and answers graded A+
passed
The term greenhouse effect refers to the idea that - correct answer ✔✔the temperature of the
earth is increasing because of heat trapped by gases such as CO2.
In the five steps used by photosynthetic organisms to convert solar energy into chemical energy,
which molecules store the solar energy before sugar synthesis? - correct answer ✔✔ATP and
NADPH
All of the following are true of both chloroplasts and mitochondria EXCEPT that they - correct
answer ✔✔produce NADPH inside the organelle
What is the overall balanced reaction for the light reactions of photosynthesis? - correct answer
✔✔2 H2O + 8 photons + 2 NADP+ + 3 ADP + 3 Pi --> O2 + 2 NADPH + 3 ATP
Which of the following is a photosynthetic light harvesting pigment? - correct answer ✔✔beta-
carotene
Resonance energy transfer from one chlorophyll in the photosystems results in - correct answer
✔✔a neighboring chlorophyll in an excited state
Which of the following is an electron transfer molecule in photosynthesis light reactions? -
correct answer ✔✔plastoquinone
The energy derived from photosynthesis and used to make ATP is manifested in what form? -
correct answer ✔✔an acidic thylakoid lumen
,Under what conditions does cyclic photophosphorylation take place? - correct answer ✔✔with
high levels of NADPH
In the chloroplasts, photosystem I (PSI) and photosystem II (PSII) are known to localize in
different regions. PSI generally localizes in the ____, whereas PSII localizes in the ____ - correct
answer ✔✔thylakoid lamellae; thylakoid grana
The third stage of the three-stage Calvin cycle - correct answer ✔✔regenerates a C5 sugar for
the Calvin cycle to continue
Overall, the net balanced reaction of the Calvin cycle converts 3 CO2 into one - correct answer
✔✔glyceraldehyde-3-phosphate
What is the name of the enzyme that catalyzes the reaction shown below? - correct answer
✔✔ribulose bisphosphate carboxylase
The five-step mechanism of ribulose bisphosphate carboxylase (rubisco) - correct answer
✔✔adds a CO2 molecule to a C5 ribulose sugar, yielding an unstable C6 molecule that cleaves
into two C3 molecules
Which of the following groups of molecules are found in the shuffling reactions of stage 3 of
photosynthesis? - correct answer ✔✔erythrose-4-phosphate, glyceraldehyde-3-phosphate, and
xylulose-5-phosphate
Under what condition(s) do the wasteful side reaction of O2 with rubisco become significant? -
correct answer ✔✔increased temperature and intense light
The glyoxylate cycle enzymes - correct answer ✔✔bypass the decarboxylation steps of the TCA
cycle, resulting in the net synthesis of a sugar molecule from acetyl-CoA
, Which of the following is classified as a monosaccharide? - correct answer ✔✔glucose
Glycoconjugates are linked to proteins or lipids via - correct answer ✔✔covalent bonds
The following figure shows the cellular processes that synthesize, secrete, and recognize
glycoconjugates in eukaryotic cells. Identify the cell surface glycoconjugates. - correct answer
✔✔5
Raffinose-series oligosaccharides are hard for humans to digest because - correct answer
✔✔humans do not have the enzyme necessary to hydrolyze the glycosidic bonds
The product Beano contains ____, which helps humans digest raffinose-series oligosaccharides.
- correct answer ✔✔alpha-galactosidase
The growth rate of nonruminating animals often decreases when they eat feed containing ____
because of the inability to digest it. - correct answer ✔✔raffinose
What type of bond is responsible for the rigid nature of the polysaccharide fibril structure? -
correct answer ✔✔hydrogen bonds
Amylose can form stable left-handed helical structures because of - correct answer
✔✔hydrogen bonds
Which glycan contains a covalently linked dimeric protein that functions as a protein anchor? -
correct answer ✔✔glycogen
A person who only expresses the GTB enzyme and not the GTA enzyme will have which blood
type? - correct answer ✔✔B
