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Ontario Secondary (Grade 9-12) Structure and Function of Plasma Membranes — practice questions — page 2

Explore 62 free Structure and Function of Plasma Membranes questions in Ontario Secondary (Grade 9-12) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Structure and Function of Plasma Membranes questions and exercises with answers

Showing questions 31–60 of 62.

How does the mass of a diffusing molecule affect its rate of diffusion?Read the answer and worked solution →Filtration is described as a variation of diffusion. What distinguishes it?Read the answer and worked solution →The integral proteins that carry out facilitated transport fall into which two functional classes?Read the answer and worked solution →What are aquaporins?Read the answer and worked solution →Osmosis is the movement of which substance across a semipermeable membrane?Read the answer and worked solution →What does the term tonicity describe?Read the answer and worked solution →What does osmolarity measure?Read the answer and worked solution →In describing a cell as being in a hypotonic or hypertonic solution, what is the point of reference?Read the answer and worked solution →An animal cell sits in a hypertonic solution. What happens to its water and its volume?Read the answer and worked solution →A red blood cell takes on so much water that the spaces between membrane molecules grow too large. What is this outcome called?Read the answer and worked solution →Paramecia and amoebas lack cell walls. What structure keeps them from bursting in a hypotonic medium?Read the answer and worked solution →Approximately how much of their metabolic energy do fish spend maintaining osmotic homeostasis?Read the answer and worked solution →Which specialized cells monitor the concentration of solutes in the blood?Read the answer and worked solution →Which blood protein is a major factor in controlling the osmotic pressures applied to tissues?Read the answer and worked solution →What is the electrical state of the interior of a living cell relative to the fluid outside it?Read the answer and worked solution →For potassium ions in a living cell, the electrical and concentration gradients pull in which directions?Read the answer and worked solution →What is the combination of a concentration gradient and an electrical gradient acting on an ion called?Read the answer and worked solution →Active transport mechanisms are collectively called pumps. What do they work against?Read the answer and worked solution →Why are active transport mechanisms sensitive to many metabolic poisons?Read the answer and worked solution →A transporter that carries two different ions in opposite directions is called what?Read the answer and worked solution →In one cycle, the sodium-potassium pump moves ions in which ratio?Read the answer and worked solution →Which materials are named as entering the cell by secondary active transport?Read the answer and worked solution →What common step do all forms of endocytosis share?Read the answer and worked solution →Which process is described as cell eating, taking in cells or relatively large particles?Read the answer and worked solution →Which white blood cell removes invading microorganisms by surrounding and engulfing them?Read the answer and worked solution →Which protein coats the inward-facing surface of the membrane and stabilises it during phagocytosis?Read the answer and worked solution →Potocytosis differs from ordinary pinocytosis in using which coating protein?Read the answer and worked solution →Which of these is given as an example of exocytosis in the body?Read the answer and worked solution →Passive or active transport?Read the answer and worked solution →Membrane transport bingoRead the answer and worked solution →

Worked practice questions

How does the mass of a diffusing molecule affect its rate of diffusion?

  1. Mass has no bearing on diffusion rate
  2. Heavier molecules diffuse more quickly
  3. Only charged molecules are slowed by mass
  4. Heavier molecules diffuse more slowly
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Correct answer: D. Heavier molecules diffuse more slowly

1. Molecules move constantly and randomly, at a rate that depends partly on their mass. 2. Heavier molecules move more slowly and therefore diffuse more slowly. 3. The reverse holds for lighter molecules, which move and diffuse faster. 4. Mass acts on every diffusing particle, charged or not, so restricting the effect to ions is wrong. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_

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Filtration is described as a variation of diffusion. What distinguishes it?

  1. Movement runs against the concentration gradient
  2. Carrier proteins bind each molecule in turn
  3. The rate is enhanced by applied pressure
  4. ATP hydrolysis supplies the driving force
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Correct answer: C. The rate is enhanced by applied pressure

1. In filtration, material still moves according to its concentration gradient through a membrane. 2. What is added is pressure, which enhances the rate and causes substances to filter more rapidly. 3. This occurs in the kidney, where blood pressure forces water and dissolved solutes out of the blood into the renal tubules. 4. Since movement still follows the gradient and needs no ATP, filtration remains a passive process. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_

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The integral proteins that carry out facilitated transport fall into which two functional classes?

  1. Receptors and enzymes
  2. Integrins and clathrins
  3. Cofactors and coenzymes
  4. Channels and carriers
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Correct answer: D. Channels and carriers

1. The integral proteins involved in facilitated transport are collectively called transport proteins. 2. They function as either channels for the material or as carriers. 3. In both cases they are transmembrane proteins, spanning the whole bilayer. 4. Receptors, integrins and clathrin all exist in or at membranes, but none of them names this two-way split. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_

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MetabolismActive TransportEnergy and MetabolismEnzymesPassive and Active TransportPassive TransportTonicity