Bio 1010c Exam 2 Questions With Complete Solutions
________ bind two or more ions or molecules and transport
them in opposite directions across a membrane.
Uniporters
Symporters
Antiporters
Dual transporters
Channel pumps Correct Answers Antiporters
A chemical reaction that has a positive ΔG is correctly described
as?
endergonic.
endothermic.
enthalpic.
spontaneous
exothermic. Correct Answers endergonic.
,A concentration gradient of glucose exists across a membrane.
This means that
there are more molecules of glucose on both sides of the
membrane.
glucose molecules are more concentrated on one side of the
membrane than on the other.
glucose crosses the membrane more quickly from one side than
to another.
the glucose molecules are chemically more tightly bonded on
one side than on the other.
there are more glucose molecules within the membrane than
outside the membrane. Correct Answers glucose molecules are
more concentrated on one side of the membrane than on the
other.
A marathon runner has just arrived in the emergency room with
severe dehydration, and the physician must decide which type of
solution to pump into her veins: pure water, 0.9% saline, or
1.5% saline. In order to be certain, blood samples are treated
with each solution and observed under a microscope. Describe
what is likely to happen to the blood cells when exposed to each
solution. Which solution should the physician choose for
rehydrating the runner AND why? Correct Answers Red blood
cells are approximately 1% solute inside the cell.
, When exposed to pure water, water rushes into the cell and the
cells rupture.
In 0.9 percent saline, the cells should neither gain nor lose a
significant amount of water.
In a 1.5 percent saline solution, the cells should lose water and
shrivel.
In order to rehydrate the runner, a solution isotonic to the
patient's blood cells, 0.9 percent, should be infused into his
bloodstream. A hypotonic solution would end up rupturing the
patient's cells.
A protein that forms an ion channel through a membrane is most
likely to be
a peripheral protein
a transmembrane protein
a phospholipid.
an enzyme.
entirely outside of the phospholipid bilayer. Correct Answers a
transmembrane protein
A student who is learning about cell structures is examining
cells through a microscope, when the student looks through the
________ bind two or more ions or molecules and transport
them in opposite directions across a membrane.
Uniporters
Symporters
Antiporters
Dual transporters
Channel pumps Correct Answers Antiporters
A chemical reaction that has a positive ΔG is correctly described
as?
endergonic.
endothermic.
enthalpic.
spontaneous
exothermic. Correct Answers endergonic.
,A concentration gradient of glucose exists across a membrane.
This means that
there are more molecules of glucose on both sides of the
membrane.
glucose molecules are more concentrated on one side of the
membrane than on the other.
glucose crosses the membrane more quickly from one side than
to another.
the glucose molecules are chemically more tightly bonded on
one side than on the other.
there are more glucose molecules within the membrane than
outside the membrane. Correct Answers glucose molecules are
more concentrated on one side of the membrane than on the
other.
A marathon runner has just arrived in the emergency room with
severe dehydration, and the physician must decide which type of
solution to pump into her veins: pure water, 0.9% saline, or
1.5% saline. In order to be certain, blood samples are treated
with each solution and observed under a microscope. Describe
what is likely to happen to the blood cells when exposed to each
solution. Which solution should the physician choose for
rehydrating the runner AND why? Correct Answers Red blood
cells are approximately 1% solute inside the cell.
, When exposed to pure water, water rushes into the cell and the
cells rupture.
In 0.9 percent saline, the cells should neither gain nor lose a
significant amount of water.
In a 1.5 percent saline solution, the cells should lose water and
shrivel.
In order to rehydrate the runner, a solution isotonic to the
patient's blood cells, 0.9 percent, should be infused into his
bloodstream. A hypotonic solution would end up rupturing the
patient's cells.
A protein that forms an ion channel through a membrane is most
likely to be
a peripheral protein
a transmembrane protein
a phospholipid.
an enzyme.
entirely outside of the phospholipid bilayer. Correct Answers a
transmembrane protein
A student who is learning about cell structures is examining
cells through a microscope, when the student looks through the
