Biology  by Bradford
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2.5 Membrane Transport: revision map

The subtopic in the middle and four tasks round it: label a diagram, complete a table, put a process in order and fill 9 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 2 practice questionsThe whole Unit 2 map

Topic 2.5

Membrane Transport

AP Biology ยท Unit 2 Cell Structure and FunctionName

2.5.A, 2.5.BThree ways across

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,high concentration above, low below1234
  1. 1
  2. 2
  3. 3
  4. 4

2.5.A, 2.5.BPassive and active transport

PassiveActive
Direction the concentration gradient the concentration gradient
Energynone needed from the cell is used
Protein needednot for simple diffusionalways: a pump or carrier
Resultgradient is used upgradient is built or maintained
Topic 2.5Membrane Transport

2.5.BA pump at work

Number the steps in order.

  1. ATP transfers a phosphate group to the pump.
  2. The phosphate leaves and the pump returns to its first shape.
  3. The solute is released on the side with the higher concentration.
  4. The solute binds to the pump on the side with the lower concentration.
  5. The pump changes shape, moving the solute across the membrane.

2.5.BGradients store energy

Particles in solution move randomly, so there is a net movement from high to low concentration, with no energy from the cell: this is transport. Moving a solute against its gradient needs energy, usually from . A gradient built by pumps stores potential energy, which cells use to power other transport and to make ATP. For example, a proton gradient across the inner mitochondrial membrane drives ATP synthase.

Word bank active transportagainstagainst the gradientATPdownfacilitated diffusionpassivesimple diffusion

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelThree ways across

    1. simple diffusion
    2. facilitated diffusion
    3. active transport
    4. against the gradient

  2. TablePassive and active transport

    PassiveActive
    Directiondown the concentration gradientagainst the concentration gradient
    Energynone needed from the cellATP is used
    Protein needednot for simple diffusionalways: a pump or carrier
    Resultgradient is used upgradient is built or maintained

  3. OrderA pump at work

    1. The solute binds to the pump on the side with the lower concentration.
    2. ATP transfers a phosphate group to the pump.
    3. The pump changes shape, moving the solute across the membrane.
    4. The solute is released on the side with the higher concentration.
    5. The phosphate leaves and the pump returns to its first shape.

  4. GapsGradients store energy

    Particles in solution move randomly, so there is a net movement from high to low concentration, with no energy from the cell: this is passive transport. Moving a solute against its gradient needs energy, usually from ATP. A gradient built by pumps stores potential energy, which cells use to power other transport and to make ATP. For example, a proton gradient across the inner mitochondrial membrane drives ATP synthase.