BIO-2420 Exam 2 Review Questions and Correct Answers
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Course
BIO 2420
Institution
BIO 2420
There were different examples of transport proteins given in class. What type is GLUT? passive transport channel
What type is the Na+/K+ pump? What type is the Na+/glucose symporter? primary active transport, secondary active transport
What is digoxin and what does it do? blocks sodium potassium ...
BIO-2420 Exam 2 Review Questions and
Correct Answers
There were different examples of transport proteins given in class. What type is GLUT?
✅passive transport channel
What type is the Na+/K+ pump? What type is the Na+/glucose symporter? ✅primary
active transport, secondary active transport
What is digoxin and what does it do? ✅blocks sodium potassium pumps, increases
sodium on inside and potassium decreases on the inside (purple fox glove flower)
what did Giuseppe antonio anastasio volta invent? ✅invented the batteries
What is a cell's resting membrane potential? What do Na+/K+ pumps do? What about
K+ leak channels? ✅-70 mv, it puts 2 K+ in and 3 Na+ out, K+ channels are more
diffusion and passive transport channels
What are fixed intracellular anions and what role do they play? what is the bolk of the
cytoplasm negative, positive or neutral? ✅ions that are in the membrane because they
cant come in and out, they interact with Na+ and K+, neutral
Why does the thickness of the plasma membrane matter? (Think about fixed
intracellular anions and what they attract) How thick is it? ✅allows extracellular ions to
electrostaticlly interact with fixed intracellular anions, 5nm
How much of the cell's total K+ ions are needed to establish the resting membrane
potential? Do you know the concentrations for Na+ and K+ ions inside vs. outside the
cell? ✅Na+ on the outside is 145 and 5-15mM on the inside, K+ on the inside is 140
and 5 on the outside
Walther Nernst came up with the Nernst equation. What can you calculate with the
Nernst equation? ✅it calculates the equilibrium potential
Which cells are the main excitable cells in the body? ✅neurons
What are some key features of action potentials?(why do they depend on voltage-gated
channels, why are they all-or-nothing events, how are they self-propagating, how are
they unidirectional?) ✅-depends on VGNC or VGCC
-all or nothing events due to transient positive feedback (50%)
- self propagating down the axon
-unidirectional travel due to spontaneous inactivation of VGNCs
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