BIOC 385 Ex. 1 All Questions with
complete solutions passed
In C3 plants CO2 is first incorporated into _____________, whereas in C4 and CAM plants the
CO2 is first incorporated into _____________.
A) 3-phosphoglycerate; oxaloacetate
B) 3-phosphoglycerate; malate
C) glyceraldehyde-3-phosphate; erythrose-4-phosphate
D) dihydroxyacetone phosphate; malate - correct answer ✔✔A) 3-phosphoglycerate;
oxaloacetate
The difference between an oxidation reaction and a reduction reaction is that oxidation is the
______________and reduction is the ______________.
A) loss of protons; gain of protons
B) gain of electrons; loss of electrons
C) gain of protons; loss of electrons
D) loss of electrons; gain of electrons - correct answer ✔✔D) loss of electrons; gain of electrons
If the Gibbs free energy change value for a reaction is less than zero, this reaction is _______.
endothermic
exergonic
endergonic
exothermic - correct answer ✔✔exergonic
,Is the net reaction favorable for the following series of coupled reactions and what supports
that conclusion?
No, ΔG°' < 0
Yes, ΔG°' > 0
No, ΔG°' > 0
Yes, ΔG°' < 0 - correct answer ✔✔Yes, ΔG°' < 0
Flux is defined as the rate at which __________is/are interconverted.
enzymes
sugars
metabolites
energy - correct answer ✔✔metabolites
Enzyme active sites ___________.
A) can only bind a single substrate at a time
B) are nonspecific with regard to substrate binding
C) are characterized as pocket or cleft
D) always exclude water in catalyzed reactions - correct answer ✔✔C) are characterized as
pocket or cleft
Which answer correctly classifies the compound with its relationship to aspartate
transcarbamoylase?
,ATP; allosteric inhibitor
CTP; substrate
ATP; allosteric activator
CTP; allosteric activator - correct answer ✔✔ATP; allosteric activator
The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large sealed
terrarium with humans and photosynthetic plants living in balance. Why did the project have to
be interrupted after only a few months?
A) levels of CO2 rose to dangerous levels
B) the plants stopped producing oxygen
C) the rate of photosynthesis was too high
D) the humans ran out of food - correct answer ✔✔A) levels of CO2 rose to dangerous levels
In what location of the cell does the Calvin-Benson cycle occur?
chloroplast stroma
chloroplast grana
thylakoid lumen
cytoplasm - correct answer ✔✔chloroplast stroma
The mitochondrial electron transport system and the photosynthetic electron transport system
have a number of common biochemical features. For each of the mitochondrial electron
transport system components listed on the left side of the table below, there is an analogous
functional component of the photosynthetic electron transport system listed on the right side.
Match the corresponding functional components.
____ 1/2 O2
, ____ cytochrome c
____ complexes I, III, IV
____ intermembrane space
____ mitochondrial matrix
____ ubiquinone
____ NAD+
____ NADH
____ inner membrane
1. cytochrome b6f
2. oxygen
3. plastoquinone
4. NADP+
5. stroma
6. plastocyanin
7. thylakoid membrane
8. thylakoid lumen
9. water - correct answer ✔✔__4__ 1/2 O2
__6__ cytochrome c
__1__ complexes I, III, IV
__8__ intermembrane space
__5__ mitochondrial matrix
__3__ ubiquinone
__2__ NAD+
__9__ NADH
__7__ inner membrane
complete solutions passed
In C3 plants CO2 is first incorporated into _____________, whereas in C4 and CAM plants the
CO2 is first incorporated into _____________.
A) 3-phosphoglycerate; oxaloacetate
B) 3-phosphoglycerate; malate
C) glyceraldehyde-3-phosphate; erythrose-4-phosphate
D) dihydroxyacetone phosphate; malate - correct answer ✔✔A) 3-phosphoglycerate;
oxaloacetate
The difference between an oxidation reaction and a reduction reaction is that oxidation is the
______________and reduction is the ______________.
A) loss of protons; gain of protons
B) gain of electrons; loss of electrons
C) gain of protons; loss of electrons
D) loss of electrons; gain of electrons - correct answer ✔✔D) loss of electrons; gain of electrons
If the Gibbs free energy change value for a reaction is less than zero, this reaction is _______.
endothermic
exergonic
endergonic
exothermic - correct answer ✔✔exergonic
,Is the net reaction favorable for the following series of coupled reactions and what supports
that conclusion?
No, ΔG°' < 0
Yes, ΔG°' > 0
No, ΔG°' > 0
Yes, ΔG°' < 0 - correct answer ✔✔Yes, ΔG°' < 0
Flux is defined as the rate at which __________is/are interconverted.
enzymes
sugars
metabolites
energy - correct answer ✔✔metabolites
Enzyme active sites ___________.
A) can only bind a single substrate at a time
B) are nonspecific with regard to substrate binding
C) are characterized as pocket or cleft
D) always exclude water in catalyzed reactions - correct answer ✔✔C) are characterized as
pocket or cleft
Which answer correctly classifies the compound with its relationship to aspartate
transcarbamoylase?
,ATP; allosteric inhibitor
CTP; substrate
ATP; allosteric activator
CTP; allosteric activator - correct answer ✔✔ATP; allosteric activator
The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large sealed
terrarium with humans and photosynthetic plants living in balance. Why did the project have to
be interrupted after only a few months?
A) levels of CO2 rose to dangerous levels
B) the plants stopped producing oxygen
C) the rate of photosynthesis was too high
D) the humans ran out of food - correct answer ✔✔A) levels of CO2 rose to dangerous levels
In what location of the cell does the Calvin-Benson cycle occur?
chloroplast stroma
chloroplast grana
thylakoid lumen
cytoplasm - correct answer ✔✔chloroplast stroma
The mitochondrial electron transport system and the photosynthetic electron transport system
have a number of common biochemical features. For each of the mitochondrial electron
transport system components listed on the left side of the table below, there is an analogous
functional component of the photosynthetic electron transport system listed on the right side.
Match the corresponding functional components.
____ 1/2 O2
, ____ cytochrome c
____ complexes I, III, IV
____ intermembrane space
____ mitochondrial matrix
____ ubiquinone
____ NAD+
____ NADH
____ inner membrane
1. cytochrome b6f
2. oxygen
3. plastoquinone
4. NADP+
5. stroma
6. plastocyanin
7. thylakoid membrane
8. thylakoid lumen
9. water - correct answer ✔✔__4__ 1/2 O2
__6__ cytochrome c
__1__ complexes I, III, IV
__8__ intermembrane space
__5__ mitochondrial matrix
__3__ ubiquinone
__2__ NAD+
__9__ NADH
__7__ inner membrane
