Pearson Edexcel A Level · Biology A (Salters-Nuffield) (9BN0)

Gas exchange surfaces and Fick's law: Practice Questions

3 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Gas exchange surfaces and Fick's law.

7 questions16 marksFree, no account

Question 1

1 mark

In DNA replication, what is the specific role of the enzyme DNA polymerase?

Question 2

1 mark

According to Fick's Law of Diffusion, which relationship correctly describes the rate of diffusion?

Question 3

1 mark

Which type of mutation is most likely to result in the genetic condition cystic fibrosis?

Question 4

2 marks

State two structural differences between a DNA mononucleotide and an RNA mononucleotide.

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Question 5

3 marks

In the context of the fluid mosaic model, explain how the structure of phospholipids enables them to form a stable bilayer in an aqueous environment.

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Question 6

2 marks

Define what is meant by a gene mutation and state how it can lead to a change in the primary structure of a protein.

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Question 7

6 marks

Topic 2: Genes and Health
Cystic fibrosis is an inherited condition caused by mutations in the CFTR gene.

(a) State the meaning of the term gene mutation<\/i>.
(b) Explain how a mutation in the DNA sequence can result in a non-functional CFTR protein being produced.
(c) Describe one way in which the sticky mucus produced by individuals with cystic fibrosis affects the functioning of the gaseous exchange system.<\/p>

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