BIOL 212 EXAM 1 & 2 QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT ANSWERS) /ALREADY GRADED A+
Quiz: GIVEN: The red blood cell membrane is impermeable to mannitol,
but is permeable to both water and glucose. Red blood cells will shrink the most
when immersed in:
- CORRECT ANSWER - a hyperosmotic mannitol solution
Quiz: During hemoglobin metabolism, the breakdown products of heme
become part of:
- CORRECT ANSWER - bile
Quiz: If potassium were at equilibrium across the cell membrane, then what
would be the direction of the electrochemical driving force
acting on potassium?
- CORRECT ANSWER - there is no electrochemical force at equilibrium
Quiz: Mice from a certain lab strain remain healthy as long as you feed them
regularly and do not let them exercise. After they eat, their blood glucose level
rises slightly and then declines to a homeostatic
level. However, if these mice fast or exercise at all, their blood glucose drops
dangerously. Which hypothesis best explains their problem?
- CORRECT ANSWER - The mice lack glucagon receptors on their cells.
,Quiz: Anesthetics cross the cell membranes in nerve tissue relatively easily.
Therefore, anesthetics have a:
- CORRECT ANSWER - high partition coefficient
Quiz: A scientist is studying the passive movement of chemicals into a cell. He
measures the rate at which two chemicals diffuse into a cell, as a function of
their external concentration. Chemical A's diffusion is directly proportional to
the extracellular concentration but eventually reaches a transport maximum,
while Chemical B's rate of transport continues to be directly proportional to
external concentration.
How can one explain the differences in these diffusion rates?
- CORRECT ANSWER - Chemical A is moving by facilitated diffusion, while
Chemical B is
diffusing through the phospholipids or through a channel.
Quiz: Given that oubain blocks the Na+/K+ pump, how would this drug affect
glucose transport in the small intestine?
- CORRECT ANSWER - Compared to normal, less glucose would be
absorbed from the lumen
of the small intestine.
Quiz: You have a 0.022 OsM solution of glucose. This solution is:
Examstudy - Stuvia US
, - CORRECT ANSWER - hypo-osmotic to human cells.
Quiz: One long-term consequence of diabetes mellitus is that the basement
membrane below the endothelial cells of capillary walls
becomes thicker. If this happens, according to Fick's Law, the rate of diffusion
of substances from the blood to the tissues will:
- CORRECT ANSWER - decrease
Quiz: The primary cation inside the cell is:
- CORRECT ANSWER - potassium
Quiz: Under low oxygen conditions, must unload its electrons to allow
glycolysis to continue its production of ATP:
- CORRECT ANSWER - NADH
Quiz: A 10% starch solution is separated from pure water by a membrane which
is impermeable to starch. What will happen?
- CORRECT ANSWER - Net water movement will eventually stop as a result
of an opposing
hydrostatic pressure.
Quiz: The end products of the Krebs cycle include all of the following except:
CORRECT ANSWERS) /ALREADY GRADED A+
Quiz: GIVEN: The red blood cell membrane is impermeable to mannitol,
but is permeable to both water and glucose. Red blood cells will shrink the most
when immersed in:
- CORRECT ANSWER - a hyperosmotic mannitol solution
Quiz: During hemoglobin metabolism, the breakdown products of heme
become part of:
- CORRECT ANSWER - bile
Quiz: If potassium were at equilibrium across the cell membrane, then what
would be the direction of the electrochemical driving force
acting on potassium?
- CORRECT ANSWER - there is no electrochemical force at equilibrium
Quiz: Mice from a certain lab strain remain healthy as long as you feed them
regularly and do not let them exercise. After they eat, their blood glucose level
rises slightly and then declines to a homeostatic
level. However, if these mice fast or exercise at all, their blood glucose drops
dangerously. Which hypothesis best explains their problem?
- CORRECT ANSWER - The mice lack glucagon receptors on their cells.
,Quiz: Anesthetics cross the cell membranes in nerve tissue relatively easily.
Therefore, anesthetics have a:
- CORRECT ANSWER - high partition coefficient
Quiz: A scientist is studying the passive movement of chemicals into a cell. He
measures the rate at which two chemicals diffuse into a cell, as a function of
their external concentration. Chemical A's diffusion is directly proportional to
the extracellular concentration but eventually reaches a transport maximum,
while Chemical B's rate of transport continues to be directly proportional to
external concentration.
How can one explain the differences in these diffusion rates?
- CORRECT ANSWER - Chemical A is moving by facilitated diffusion, while
Chemical B is
diffusing through the phospholipids or through a channel.
Quiz: Given that oubain blocks the Na+/K+ pump, how would this drug affect
glucose transport in the small intestine?
- CORRECT ANSWER - Compared to normal, less glucose would be
absorbed from the lumen
of the small intestine.
Quiz: You have a 0.022 OsM solution of glucose. This solution is:
Examstudy - Stuvia US
, - CORRECT ANSWER - hypo-osmotic to human cells.
Quiz: One long-term consequence of diabetes mellitus is that the basement
membrane below the endothelial cells of capillary walls
becomes thicker. If this happens, according to Fick's Law, the rate of diffusion
of substances from the blood to the tissues will:
- CORRECT ANSWER - decrease
Quiz: The primary cation inside the cell is:
- CORRECT ANSWER - potassium
Quiz: Under low oxygen conditions, must unload its electrons to allow
glycolysis to continue its production of ATP:
- CORRECT ANSWER - NADH
Quiz: A 10% starch solution is separated from pure water by a membrane which
is impermeable to starch. What will happen?
- CORRECT ANSWER - Net water movement will eventually stop as a result
of an opposing
hydrostatic pressure.
Quiz: The end products of the Krebs cycle include all of the following except:
