VPHY final questions with 100%
complete solutions
Increased levels of circulating blood glucose cause certain hormones to be
released that then cause blood glucose levels to go back down. This is an example
of: - correct answer ✔✔A negative feedback mechanism
Hydrophobic molecules tend to - correct answer ✔✔aggregate in order to "stay
away" from water
About 2/3 of our total body water in contained - correct answer ✔✔inside of cells
The basic structure of the plasma membrane is a(n) - correct answer
✔✔phospholipid bilayer
_____ can simply diffuse directly through the plasma membrane - correct answer
✔✔gases
For an uncharged solute, the diffusional driving force across the plasma
membrane is proportional to its - correct answer ✔✔concentration gradient
What is the net diffusion of water down its concentration gradient? - correct
answer ✔✔Osmosis
, What is a unit for measuring the total concentration of all solutes present in a
solution? - correct answer ✔✔Osmolarity
How do you describe an isotonic solution? - correct answer ✔✔has the same total
solute concentration and the same water concentration
Between pump, antiporter, and ion channel, which of the following is a passive
transporter? - correct answer ✔✔ion channel
The Na/K ATPase keeps the intracellular ____ concentration low, relative to
outside the cell - correct answer ✔✔sodium
What does the typical resting membrane potential (VR) tells us that: - correct
answer ✔✔there are excess negative charges inside the cell (-70mv)
Ions are subject to: - correct answer ✔✔both chemical and electrical driving
forces
When the membrane potential (Vm) is exactly equal to the Nernst potential for K+
(Ek), then: - correct answer ✔✔there is no net movement of K+ ions through open
K channels
What allows ions to flow directly through the receptor protein? - correct answer
✔✔Ligand-gated ion channels
complete solutions
Increased levels of circulating blood glucose cause certain hormones to be
released that then cause blood glucose levels to go back down. This is an example
of: - correct answer ✔✔A negative feedback mechanism
Hydrophobic molecules tend to - correct answer ✔✔aggregate in order to "stay
away" from water
About 2/3 of our total body water in contained - correct answer ✔✔inside of cells
The basic structure of the plasma membrane is a(n) - correct answer
✔✔phospholipid bilayer
_____ can simply diffuse directly through the plasma membrane - correct answer
✔✔gases
For an uncharged solute, the diffusional driving force across the plasma
membrane is proportional to its - correct answer ✔✔concentration gradient
What is the net diffusion of water down its concentration gradient? - correct
answer ✔✔Osmosis
, What is a unit for measuring the total concentration of all solutes present in a
solution? - correct answer ✔✔Osmolarity
How do you describe an isotonic solution? - correct answer ✔✔has the same total
solute concentration and the same water concentration
Between pump, antiporter, and ion channel, which of the following is a passive
transporter? - correct answer ✔✔ion channel
The Na/K ATPase keeps the intracellular ____ concentration low, relative to
outside the cell - correct answer ✔✔sodium
What does the typical resting membrane potential (VR) tells us that: - correct
answer ✔✔there are excess negative charges inside the cell (-70mv)
Ions are subject to: - correct answer ✔✔both chemical and electrical driving
forces
When the membrane potential (Vm) is exactly equal to the Nernst potential for K+
(Ek), then: - correct answer ✔✔there is no net movement of K+ ions through open
K channels
What allows ions to flow directly through the receptor protein? - correct answer
✔✔Ligand-gated ion channels
