Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 9, Problem 7RQ

Why are ion channels necessary to transport ions into or out of a cell?

  1. Ions are too large to diffuse through the membrane.
  2. Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane.
  3. Ions do not need ion channels to move through the membrane.
  4. Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.

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Which of the following is a characteristic of facilitated diffusion (passive transport) of a molecule across a membrane? OOO The rate of transport is saturable. It is highly specific for the molecule being transported. All of the answers are correct. Its rate is higher than that of simple diffusion of the molecule. The direction of transport is determined by concentration and/or electrochemical gradients.
Which of the following statements is NOT TRUE about membrane transport? to facilitate movement of ions and molecules across membranes. to move food, water, and wastes around, into, and out of a cell. to get rid of duplicated organelles in a cell. to transport proteins, lipids, and other molecules synthesized by the cell.
Which of the following regarding the sodium potassium pump is FALSE?   It tends to be found on the apical plasma membrane of polarized cells It transports three sodium ions to the outside of the cell It transports two potassium ions to the inside of the cell. It helps to maintain unequal distribution of ions across the plasma membrane

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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license