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Cambridge IGCSE Biology practice

Paper 3 structured question: Sexually transmitted infections

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Sexually transmitted infections

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Paper 3Theory (Core)1 marks

HIV infection affects the immune system by destroying T-helper cells. This weakens the body's ability to fight infections and diseases.

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Effect of HIV on the Immune System

As HIV destroys T-helper cells, the immune system becomes less effective. When the immune system is very weak, the person is diagnosed with AIDS.

  1. a

    Identify the type of cells destroyed by HIV.

    Aim for approximately 1 distinct marking point.

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Paper 3 structured question: Sexually transmitted infections

Paper 3Theory (Core)1 marks

Description

HIV and AIDS

HIV attacks T-helper cells, which are important for the immune response. As the number of T-helper cells decreases, the immune system becomes weaker. When the immune system is severely damaged, the condition is called AIDS.

  1. a

    State the condition that can develop from an HIV infection.

    Aim for approximately 1 distinct marking point.

    [1]