PCB 3023 FINAL EXAM QUESTIONS
WITH DETAILED VERIFIED ANSWERS
__________ are fairly small organelles that provide a safe place
within the cell to carry out certain biochemical reactions that
generate harmful, highly reactive oxygen species. These
chemicals are both generated and broken down in the same
location.
(a) Nucleosomes
(b) Lysosomes
(c) Peroxisomes
(d) Endosomes - correct answer- (c) Peroxisomes
1-37 Which of the following choices best describes the role of
the lysosome? "lysosome=Lysol" - correct answer- (b)
clean-up, recycling, and disposal of macromolecules
A hungry yeast cell lands in a vat of grape juice and begins to
feast on the sugars there, producing carbon dioxide and ethanol
in the process:
C6H12O6 + 2ADP + 2Pi + H+ → 2CO2 + 2CH3CH2OH + 2ATP +
2H2O
,Unfortunately, the grape juice is contaminated with proteases
that attack some of the transport proteins in the yeast cell
membrane, and the yeast cell dies. Which of the following could
account for the yeast cell's demise?
(a) toxic buildup of carbon dioxide inside the cell
(b) toxic buildup of ethanol inside the cell
(c) diffusion of ATP out of the cell
(d) inability to import sugar into the cell - correct answer-
(d) inability to import sugar into the cell
A large protein that passes through the nuclear pore must have
an appropriate _________.
(a) sorting sequence, which typically contains the positively
charged amino acids lysine and arginine.
(b) sorting sequence, which typically contains the hydrophobic
amino acids leucine and isoleucine.
(c) sequence to interact with the nuclear fibrils.
(d) Ran-interacting protein domain. - correct answer- (a)
sorting sequence, which typically contains the positively charged
amino acids lysine and arginine.
,A. thaliana, or Arabidopsis, is a common weed. Biologists have
selected it over hundreds of thousands of other flowering plant
species to serve as an experimental model organism because
__________________.
(a) it can withstand extremely cold climates.
(b) it can reproduce in 8-10 weeks.
(c) it produces thousands of offspring per plant.
(d) Both (b) and (c) are true. - correct answer- (b) it can
reproduce in 8-10 weeks.
Active transport requires the input of energy into a system so as
to move solutes against their electrochemical and concentration
gradients. Which of the following is not one of the common
ways to perform active transport?
(a) Na+-coupled
(b) K+-coupled
(c) ATP-driven
(d) light-driven - correct answer- (b) K+-coupled
After isolating the rough endoplasmic reticulum from the rest of
the cytoplasm, you purify the RNAs attached to it. Which of the
following proteins do you expect the RNA from the rough
endoplasmic reticulum to encode?
, (a) soluble secreted proteins
(b) ER membrane proteins
(c) plasma membrane proteins
(d) all of the above - correct answer- (d) all of the above
Although the extracellular environment has a high sodium ion
concentration and the intracellular environment has a high
potassium ion concentration, both must be neutralized by
negatively charged molecules. In the extracellular case, what is
the principal anion?
(a) HCO3-
(b) Cl-
(c) PO43-
(d) OH- - correct answer- (b) Cl-
Although there are many distinct prokaryotic species, most have
a small range of shapes, sizes, and growth rates. Which of the
following characteristics are not observed in prokaryotes?
(a) a highly structured cytoplasm
(b) endoplasmic reticulum
(c) the ability to divide rapidly
WITH DETAILED VERIFIED ANSWERS
__________ are fairly small organelles that provide a safe place
within the cell to carry out certain biochemical reactions that
generate harmful, highly reactive oxygen species. These
chemicals are both generated and broken down in the same
location.
(a) Nucleosomes
(b) Lysosomes
(c) Peroxisomes
(d) Endosomes - correct answer- (c) Peroxisomes
1-37 Which of the following choices best describes the role of
the lysosome? "lysosome=Lysol" - correct answer- (b)
clean-up, recycling, and disposal of macromolecules
A hungry yeast cell lands in a vat of grape juice and begins to
feast on the sugars there, producing carbon dioxide and ethanol
in the process:
C6H12O6 + 2ADP + 2Pi + H+ → 2CO2 + 2CH3CH2OH + 2ATP +
2H2O
,Unfortunately, the grape juice is contaminated with proteases
that attack some of the transport proteins in the yeast cell
membrane, and the yeast cell dies. Which of the following could
account for the yeast cell's demise?
(a) toxic buildup of carbon dioxide inside the cell
(b) toxic buildup of ethanol inside the cell
(c) diffusion of ATP out of the cell
(d) inability to import sugar into the cell - correct answer-
(d) inability to import sugar into the cell
A large protein that passes through the nuclear pore must have
an appropriate _________.
(a) sorting sequence, which typically contains the positively
charged amino acids lysine and arginine.
(b) sorting sequence, which typically contains the hydrophobic
amino acids leucine and isoleucine.
(c) sequence to interact with the nuclear fibrils.
(d) Ran-interacting protein domain. - correct answer- (a)
sorting sequence, which typically contains the positively charged
amino acids lysine and arginine.
,A. thaliana, or Arabidopsis, is a common weed. Biologists have
selected it over hundreds of thousands of other flowering plant
species to serve as an experimental model organism because
__________________.
(a) it can withstand extremely cold climates.
(b) it can reproduce in 8-10 weeks.
(c) it produces thousands of offspring per plant.
(d) Both (b) and (c) are true. - correct answer- (b) it can
reproduce in 8-10 weeks.
Active transport requires the input of energy into a system so as
to move solutes against their electrochemical and concentration
gradients. Which of the following is not one of the common
ways to perform active transport?
(a) Na+-coupled
(b) K+-coupled
(c) ATP-driven
(d) light-driven - correct answer- (b) K+-coupled
After isolating the rough endoplasmic reticulum from the rest of
the cytoplasm, you purify the RNAs attached to it. Which of the
following proteins do you expect the RNA from the rough
endoplasmic reticulum to encode?
, (a) soluble secreted proteins
(b) ER membrane proteins
(c) plasma membrane proteins
(d) all of the above - correct answer- (d) all of the above
Although the extracellular environment has a high sodium ion
concentration and the intracellular environment has a high
potassium ion concentration, both must be neutralized by
negatively charged molecules. In the extracellular case, what is
the principal anion?
(a) HCO3-
(b) Cl-
(c) PO43-
(d) OH- - correct answer- (b) Cl-
Although there are many distinct prokaryotic species, most have
a small range of shapes, sizes, and growth rates. Which of the
following characteristics are not observed in prokaryotes?
(a) a highly structured cytoplasm
(b) endoplasmic reticulum
(c) the ability to divide rapidly
