Membrane Transport

howcontrived
Quiz by , created over 4 years ago

A medium-difficulty quiz on the basics of Cell Biology.

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howcontrived
Created by howcontrived over 4 years ago
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Question 1

Question
How will a small decrease in extracellular sodium ion concentrations affect sodium transport across the plasma membrane.
Answer
  • Sodium ions will continue to move via simple diffusion into the cell.
  • Sodium ions will still flow into the cell, but at a slightly slower rate.
  • The direction of sodium ion movement will be reversed.
  • Sodium transporters will require energy to pump the ions against their gradient.
  • None of these answers is correct.

Question 2

Question
Which of the following is true about carbon dioxide transport?
Answer
  • It diffuses freely across membranes.
  • It require a carrier protein to diffuse into cells.
  • Carbon dioxide and oxygen are transported in/out of the cell through an anti-porter.
  • It is converted to bicarbonate in erythrocytes and transported from the body to the lungs.
  • None of the above

Question 3

Question
Based on the patch clamp recording shown here, which of the following is true.
Answer
  • The channel being recorded spends more time open than it does closed.
  • The flow of ions through the channel is indicated by the increase in current.
  • Sodium flows through the channel more often than calcium.
  • The channel allows both negative and positive ions to flow through.
  • None of these is true.

Question 4

Question
Binding of a ligand to its receptor of the cell membrane can directly cause:
Answer
  • Opening of an ion channel.
  • Activation of a carrier protein.
  • Endocytosis.
  • None of the above.

Question 5

Question
Glucose moves _____ its concentration gradient from the intestinal lumen into cells, and then ________ its gradient across the basal lamina.
Answer
  • up, up
  • up, down
  • down, up
  • down, down

Question 6

Question
Decreasing the proton concentration in the mitochondrial intermembrane space would __________ the production of ATP, via ATP synthase, an ______________________.
Answer
  • increase, F-type pump
  • Increase, ABC transporter
  • Decrease, F-type pump
  • Decrease, ABC transporter

Question 7

Question
Caffeine is an agonist for the ryanodine receptor. What effect would an increase in intracellular caffeine have on muscle cells? Why? There may be multiple correct answers.
Answer
  • Muscle cells would contract more often because calcium would be released more often from the SR.
  • Muscles would become more stiff because calcium would be removed from the cell more quickly.
  • Muscle contraction would be stronger because more calcium would be released into the cytoplasm.
  • None of these.

Question 8

Question
In which answer have the molecule been correctly arranged by their ability to freely diffuse across the plasma membrane, from least to most permeable.
Answer
  • Ethanol, K+, nitrous oxide (NO), glucose.
  • Sodium ions, glucose, oxygen, water.
  • Protons , glucose, ethanol, carbon dioxide.
  • Water, Cl-, glucose, nitrous oxide (NO).

Question 9

Question
Which of the following are true about voltage-gated ion channels?
Answer
  • Size of pore and ability of channel to strip ion of water molecules determines which ions are allowed through.
  • They only participate in passive transport.
  • Most of them are opened by depolarization.
  • Some of them contain an inactivating loop.

Question 10

Question
__________________ ATPases are responsible for pumping protons ________ their electrochemical gradient into vesicles. The proton gradient is then used to transport neurotransmitter __________ the vesicles.
Answer
  • V-type, up, into
  • F-type, up, out of
  • V-type, down, into
  • F-type, up, into
  • ABC, up, out of