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1.3 Transport in cells

1.3 Transport in cells

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Question 14
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A patient recovering from a lung infection needs to regenerate damaged respiratory tissues.

a.

What is diffusion? Select one option:

  • A: The net movement of water molecules from a dilute solution to a concentrated solution through a partially permeable membrane.
  • B: The movement of solute particles from a region of low concentration to a region of high concentration.
  • C: The net movement of particles from a region of higher concentration to a region of lower concentration.
[1]
b.

The human lungs contain millions of microscopic air sacs called alveoli. Describe how this feature increases the rate of diffusion of oxygen into the blood.

[2]
c.

Complete the sentences below about the healing of damaged respiratory tissue:

  • To replace damaged tissue and grow new cells, stem cells in the lungs divide by the process of [blank 1]\text{[blank 1]}[blank 1].
  • When these stem cells specialize to become functional epithelial cells, this process is known as [blank 2]\text{[blank 2]}[blank 2].
[2]
Markscheme

1.3 Transport in cells Questions

  1. GCSE
  2. /Biology
  3. /1.3 Transport in cells

30 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.

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