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5.1 Health and communicable disease

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Question 2

A DNA virus is added to two samples of cultured fish gill cells. One sample receives a treatment. Tests show that cells in both samples receive equal amounts of viral DNA and produce viral proteins. Six hours later, the amount of viral DNA has increased in the untreated cells but has not increased in the treated cells.

Which stage of viral reproduction does the treatment directly block?

[1]
A

production of new copies of the viral DNA

B

release of complete virus particles when the host cell lyses

C

activation of viral genes that are integrated into host DNA

D

packaging of copied viral DNA inside new protein coats

Markscheme

5.1 Health and communicable disease Questions

  1. GCSE
  2. /Biology
  3. /5.1 Health and communicable disease

112 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.

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