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Lecture 5: Membrane Transport// IAHSS ADVANCED OFFICER CERTIFICATIONS EXAMS |ACCURATE TESTING VERSIONS
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  • Course
  • Lecture 5: Membrane Tran
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  • Abacus College, Oxford

At rest, is the inside of the cell negatively charged or positively charged? - ANSWER-negative At rest, what is the concentration gradient of Na+ and of K+? If we allow these ions to move, where will they move? - ANSWER--Most cells have a negative membrane potential as a result of uneven d...

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  • March 9, 2024
  • 6
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • lecture 5 membrane transport
  • lecture 5 membrane transport iahss advanced o

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  • Abacus College, Oxford
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  • Lecture 5: Membrane Tran
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Lecture 5: Membrane
Transport// IAHSS ADVANCED
OFFICER CERTIFICATIONS
EXAMS |ACCURATE TESTING
VERSIONS




At rest, is the inside of the cell negatively charged or
positively charged? - ANSWER-negative


At rest, what is the concentration gradient of Na+ and of
K+? If we allow these ions to move, where will they
move? - ANSWER--Most cells have a negative membrane

, potential as a result of uneven distribution of ions on
either side of the membrane
-This is important because it creates a chemical gradient,
where some ions are higher on one side than the other
-channels move materials down the concentration
gradient


What are the three types of membrane transport? -
ANSWER--diffusion (through the membrane)
-channels (non-gated or gated)
-carriers (facilitators or pumps)


Which type of membrane transport require energy? -
ANSWER-pumps (active) require energy


Why can't everything diffuse across the membrane? -
ANSWER--small, non polar molecules can diffuse across
the lipid bilayer (CO2, O2, H2O)

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