Biochemistry 385 - Exam 1 questions
and answers graded A+
Photon absorption by chlorophyll molecules results in... - correct answer ✔✔resonance energy
transfer, photooxidation, and fluorescence
Put the following cellular components in the order they exist within a plant cell beginning with
the innermost compartment, which is the chloroplast thylakoid lumen and ending with the
outermost component, which is the plant cell wall
1 Thylakoid lumen
____ Plant cell plasma membrane
____ Chloroplast inner membrane
____ Plant cell cytoplasm
____ Chloroplast stroma
____ Thylakoid membrane
____ Chloroplast outer membrane
8 Plant cell wall - correct answer ✔✔1, 7, 4, 6, 3, 2, 5, 8
Cyclic ____ refers to a process in which the ____ being transferred through the ____ complex is
shunted back to ____ instead of being used to oxidize ____. This occurs when NADPH levels are
____. - correct answer ✔✔photophosphorylation; electron; PSI; plastoquinone; reduce NADP+;
high
In what chloroplast component is the oxygen-evolving complex (OEC) located? - correct answer
✔✔PSII complex
,Which condition is most likely to increase the rate of metabolic flux through a linear pathway? -
correct answer ✔✔formation of a multi-enzyme complex consisting of all pathway enzymes
C4 or CAM: Uses spatial separation of CO2 fixation - correct answer ✔✔C4
C4 or CAM: Saguaro cacti are an example - correct answer ✔✔CAM
C4 or CAM: Phosphoenolpyruvate carboxylase inactive when stomata are closed - correct
answer ✔✔CAM
C4 or CAM: Malate is stored in vacuoles - correct answer ✔✔CAM
C4 or CAM: Phosphoenolpyruvate carboxylase only active in mesophyll cells - correct answer
✔✔C4
C4 or CAM: Temporal separation of CO2 fixation - correct answer ✔✔CAM
C4 or CAM: Stomata only open at night - correct answer ✔✔CAM
C4 or CAM: Sugar cane is an example - correct answer ✔✔C4
The two chemical structures shown below are antibiotics. Answer each of the questions below
with either "1" or "2" depending on which structure(s) answers the questions.
a. Antibiotic that is ineffective against MRSA infections
b. Antibiotic that is cleaved by enzyme beta-lactamase
c. Antibiotic that is effective against penicillin-resistant bacteria
, d. Antibiotic that inhibits the enzyme transpeptidase - correct answer ✔✔a) 1 and 2, b) 2, c) 1,
d) 1 and 2
The chloroplast electron transport system is located in the thylakoid ____ and translocates
protons into the ____. The oxidation of H2O to generate O2 takes place in the ____ and
generates protons, which contribute to the differential proton gradient across the ____
membrane. The Calvin-Benson cycle enzymes are located in the ____ and use ATP and ____
produced by the photosynthesis electron transport system to convert ____ to glyceraldehyde-3_
- correct answer ✔✔membrane; thylakoid lumen; thylakoid lumen; thylakoid; stroma; NADPH;
CO2
What stage of the Calvin Cycle is when ribulose-1,5-bisphosphate is combined with CO2 to form
two moles of 3-phosphoglycerate? - correct answer ✔✔S1
What stage of the Calvin Cycle is when 3-phosphoglycerate is reduced to form glyceraldehyde-
3P at the expense of ATP and NADPH? - correct answer ✔✔S2
What stage of the Calvin Cycle is when glyceraldehyde-3P is used to reform ribulose-1,5-
bisphosphate using the carbon shuffle? - correct answer ✔✔S3
What is the biochemical explanation for why G6PD deficiencies are so prevalent in Africa? -
correct answer ✔✔because they lower reduced glutathione (GSH); malarial parasites die in a
high ROS environment
Which statement about enzyme structure and function is the most correct? - correct answer
✔✔enzymes increase rates of biochemical reactions without changing the equilibrium constant
What are living organisms trying to avoid as long as possible? - correct answer ✔✔equilibrium
with Earth
and answers graded A+
Photon absorption by chlorophyll molecules results in... - correct answer ✔✔resonance energy
transfer, photooxidation, and fluorescence
Put the following cellular components in the order they exist within a plant cell beginning with
the innermost compartment, which is the chloroplast thylakoid lumen and ending with the
outermost component, which is the plant cell wall
1 Thylakoid lumen
____ Plant cell plasma membrane
____ Chloroplast inner membrane
____ Plant cell cytoplasm
____ Chloroplast stroma
____ Thylakoid membrane
____ Chloroplast outer membrane
8 Plant cell wall - correct answer ✔✔1, 7, 4, 6, 3, 2, 5, 8
Cyclic ____ refers to a process in which the ____ being transferred through the ____ complex is
shunted back to ____ instead of being used to oxidize ____. This occurs when NADPH levels are
____. - correct answer ✔✔photophosphorylation; electron; PSI; plastoquinone; reduce NADP+;
high
In what chloroplast component is the oxygen-evolving complex (OEC) located? - correct answer
✔✔PSII complex
,Which condition is most likely to increase the rate of metabolic flux through a linear pathway? -
correct answer ✔✔formation of a multi-enzyme complex consisting of all pathway enzymes
C4 or CAM: Uses spatial separation of CO2 fixation - correct answer ✔✔C4
C4 or CAM: Saguaro cacti are an example - correct answer ✔✔CAM
C4 or CAM: Phosphoenolpyruvate carboxylase inactive when stomata are closed - correct
answer ✔✔CAM
C4 or CAM: Malate is stored in vacuoles - correct answer ✔✔CAM
C4 or CAM: Phosphoenolpyruvate carboxylase only active in mesophyll cells - correct answer
✔✔C4
C4 or CAM: Temporal separation of CO2 fixation - correct answer ✔✔CAM
C4 or CAM: Stomata only open at night - correct answer ✔✔CAM
C4 or CAM: Sugar cane is an example - correct answer ✔✔C4
The two chemical structures shown below are antibiotics. Answer each of the questions below
with either "1" or "2" depending on which structure(s) answers the questions.
a. Antibiotic that is ineffective against MRSA infections
b. Antibiotic that is cleaved by enzyme beta-lactamase
c. Antibiotic that is effective against penicillin-resistant bacteria
, d. Antibiotic that inhibits the enzyme transpeptidase - correct answer ✔✔a) 1 and 2, b) 2, c) 1,
d) 1 and 2
The chloroplast electron transport system is located in the thylakoid ____ and translocates
protons into the ____. The oxidation of H2O to generate O2 takes place in the ____ and
generates protons, which contribute to the differential proton gradient across the ____
membrane. The Calvin-Benson cycle enzymes are located in the ____ and use ATP and ____
produced by the photosynthesis electron transport system to convert ____ to glyceraldehyde-3_
- correct answer ✔✔membrane; thylakoid lumen; thylakoid lumen; thylakoid; stroma; NADPH;
CO2
What stage of the Calvin Cycle is when ribulose-1,5-bisphosphate is combined with CO2 to form
two moles of 3-phosphoglycerate? - correct answer ✔✔S1
What stage of the Calvin Cycle is when 3-phosphoglycerate is reduced to form glyceraldehyde-
3P at the expense of ATP and NADPH? - correct answer ✔✔S2
What stage of the Calvin Cycle is when glyceraldehyde-3P is used to reform ribulose-1,5-
bisphosphate using the carbon shuffle? - correct answer ✔✔S3
What is the biochemical explanation for why G6PD deficiencies are so prevalent in Africa? -
correct answer ✔✔because they lower reduced glutathione (GSH); malarial parasites die in a
high ROS environment
Which statement about enzyme structure and function is the most correct? - correct answer
✔✔enzymes increase rates of biochemical reactions without changing the equilibrium constant
What are living organisms trying to avoid as long as possible? - correct answer ✔✔equilibrium
with Earth
