Exam (elaborations)

Biol 141 Exam Questions with All Correct Answers

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Biol 141

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Biol 141

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biol 141
what is primary transport
biol 141 exam questions with all correct answers

Institution Biol 141
Course Biol 141

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Biol 141 Exam Questions with All
Correct Answers
What is primary transport? - Answer-protein pumps move solutes UP a concentration
gradient using ATP hydrolysis

What is secondary transport? - Answer-the use of energy stored in an ionic
concentration gradient (H+) then moves molecules from low to high concentration

Which of the following is true regarding passive transport?
- Passive transport requires ATP (energy)
- Passive transport includes facilitated diffusion
- Passive transport never involves a cell membrane
- Passive transport is used to move molecules UP their concentration gradient -
Answer-Passive transport includes facilitated diffusion

A blood cell is placed into a solution which contains more solutes than the cytoplasm of
the cell. The solute cannot travel across the membrane but water can. Which scenario
will occur?
- Cell will gain water and swell
- Cell will lose water and shrink
- Cell will stay the same size - Answer-Cell will lose water and shrink

Which is true regarding active transport?
- ATP hydrolysis → (ADP + P + energy) is required form both primary and secondary
active transport to take place
- An example of secondary transport is the Na-K Pump
- Active transport moves ions/molecules from low to high
- An example of primary active transport includes ions moving up their gradient using
energy of another ion gradient - Answer-Active transport moves ions/molecules from
low to high

A drug binds to and inhibits protein pumps (enzyme pumps that use ATP) of a cell.
What is one result of this event?
- Passive transport will not occur
- Solutes will not move down concentration gradient
- Primary active transport will not occur
- Facilitated discussion will not occur - Answer-Primary active transport will not occur

Which of the following classes of neurons are responsible for perceiving sensory
information?

Interneuron

, Afferent neuron
Efferent neuron
Motor neuron - Answer-Afferent neuron

If the membrane is permeable to sodium ions via leak channels which way will they
diffuse? - Answer-they will diffuse into the cell

If the membrane is permeable to potassium ions, which way will they diffuse? - Answer-
out of the cell

T or F: An excitatory postsynaptic potential is always depolarization - Answer-true

Which of the following is true?
- Protein pumps require no energy to create gradients
- Sodium ions tend to diffuse into a neuron bc of both their chemical and electrical
gradient
- Neuron membranes are more permeable to Na+ ions so RMP is negative
- Large anions are trapped outside the neuron cell membrane - Answer-Sodium ions
tend to diffuse into a neuron bc of both their chemical and electrical gradient

Are potassium or sodium channels more permeable? - Answer-POTASSIUM

If a ligand binds to a ligand-gated Na+ channel in the membrane of a neuron, which way
will sodium diffuse? - Answer-into the cell

During a hyper-polarizing local potential an interneuron....
- The potential becomes _______ positive
- _______ ligand-gated channels open
- T or F: An action will be triggered
- T or F: The local potential will be communicated to the next neuron - Answer-less ;
potassium ; false ; false
(action only triggered during depolarization)

Depolarization of a neuron plasma membrane will shift the membrane potential toward
_____ - Answer-0mV

A neurotransmitter from a presynaptic neuron causes an inhibitory postsynaptic signal
(IPSP) in the postysynaptic neuron. Which if the following events will occur FIRST
- Potassium ligand-gated channels open
- Sodium-gated ligand channels open
- An action potential is initiated in the postsynaptic neuron
- The postsynaptic neuron will hyperpolarize - Answer-Potassium ligand-gated channels
open

T or F: There are more anions inside of a cell membrane than outside that help
establish RMP. - Answer-true

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