BIOC 385 Exam 1 questions well
answered
As a protein folds, what are the stabilizing forces that help keep the protein folded? - correct
answer ✔✔hydrophobic amino acids on the interior and hydrophilic amino acids on the exterior
How can an unfavorable reaction ( G> 0) still occur in a metabolic pathway? - correct answer
✔✔link it to a favorable reaction
Red blood cells are placed into a solution of unknown solute concentration. After an hour they
have all burst open. The best explanation is that the solution - correct answer ✔✔had no
solutes
In a hydrogen bond between a water molecule and another water molecule, - correct answer
✔✔the hydrogen bond typically forms between the oxygen atom of the water and the hydrogen
on the other water.
The three stages of the Calvin cycle are - correct answer ✔✔(1) fix CO2, (2) use NADPH and ATP,
and (3) regenerate the starting C5 molecule.
Chlorophyll absorbs - correct answer ✔✔photon energy and becomes excited or oxidized.
C4 plants are thought to be more efficient than C3 plants because they - correct answer ✔✔can
concentrate the CO2 in chloroplasts and therefore minimize side reactions with O2.
The enzyme in the photosynthetic Z scheme that catalyzes the PQ cycle, which is analogous to
Complex III and the Q cycle in the mitochondrial electron transport chain, is... - correct answer
✔✔cytochrome b6f
, Which is a way that light controls the Calvin cycle activity? - correct answer ✔✔Reduced
ferredoxin from the light reactions keeps thioredoxin reduced, which keeps Calvin cycle
enzymes in an active form.
What group in photosystem II (PSII) directly reacts with H2O during its light-driven oxidation? -
correct answer ✔✔oxygen evolving center
The O2 generated from photosynthesis is derived from - correct answer ✔✔water molecules
that directly reduce PSII*.
When NADPH/NADP+ ratios are high in chloroplasts, photophosphorylation via the cyclic e-
pathway predominates. Select the ONE statement below that best describes the consequences
of the shift to this pathway.. - correct answer ✔✔O2 evolution decreases and NADPH formation
decreases.
Starting from the oxidative phase of the pentose phosphate pathway, how many ATP and high-
energy reduced molecules, respectively, are made in going from one glucose molecule to
glyceraldehyde-3-phosphate and fructose-6-phosphate? - correct answer ✔✔0,2
Which glycan contains both -1,4 glycosidic bonds and -1,6 glycosidic bonds? - correct answer
✔✔amylopectin
Maximal activity of pyruvate carboxylase depends on which of the following substances?
Choose the FOUR that apply. - correct answer ✔✔Bicarbonate [HCO3-]
Acetyl-Coenzyme A [Acetyl-CoA]
Pyruvate
Biotin
answered
As a protein folds, what are the stabilizing forces that help keep the protein folded? - correct
answer ✔✔hydrophobic amino acids on the interior and hydrophilic amino acids on the exterior
How can an unfavorable reaction ( G> 0) still occur in a metabolic pathway? - correct answer
✔✔link it to a favorable reaction
Red blood cells are placed into a solution of unknown solute concentration. After an hour they
have all burst open. The best explanation is that the solution - correct answer ✔✔had no
solutes
In a hydrogen bond between a water molecule and another water molecule, - correct answer
✔✔the hydrogen bond typically forms between the oxygen atom of the water and the hydrogen
on the other water.
The three stages of the Calvin cycle are - correct answer ✔✔(1) fix CO2, (2) use NADPH and ATP,
and (3) regenerate the starting C5 molecule.
Chlorophyll absorbs - correct answer ✔✔photon energy and becomes excited or oxidized.
C4 plants are thought to be more efficient than C3 plants because they - correct answer ✔✔can
concentrate the CO2 in chloroplasts and therefore minimize side reactions with O2.
The enzyme in the photosynthetic Z scheme that catalyzes the PQ cycle, which is analogous to
Complex III and the Q cycle in the mitochondrial electron transport chain, is... - correct answer
✔✔cytochrome b6f
, Which is a way that light controls the Calvin cycle activity? - correct answer ✔✔Reduced
ferredoxin from the light reactions keeps thioredoxin reduced, which keeps Calvin cycle
enzymes in an active form.
What group in photosystem II (PSII) directly reacts with H2O during its light-driven oxidation? -
correct answer ✔✔oxygen evolving center
The O2 generated from photosynthesis is derived from - correct answer ✔✔water molecules
that directly reduce PSII*.
When NADPH/NADP+ ratios are high in chloroplasts, photophosphorylation via the cyclic e-
pathway predominates. Select the ONE statement below that best describes the consequences
of the shift to this pathway.. - correct answer ✔✔O2 evolution decreases and NADPH formation
decreases.
Starting from the oxidative phase of the pentose phosphate pathway, how many ATP and high-
energy reduced molecules, respectively, are made in going from one glucose molecule to
glyceraldehyde-3-phosphate and fructose-6-phosphate? - correct answer ✔✔0,2
Which glycan contains both -1,4 glycosidic bonds and -1,6 glycosidic bonds? - correct answer
✔✔amylopectin
Maximal activity of pyruvate carboxylase depends on which of the following substances?
Choose the FOUR that apply. - correct answer ✔✔Bicarbonate [HCO3-]
Acetyl-Coenzyme A [Acetyl-CoA]
Pyruvate
Biotin
