Infection and Response Worksheet - GCSE - Beginner

Infection and Response worksheet for GCSE (Key Stage 4 / GCSE (Ages 14-16)). Beginner level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Science•Key Stage 4 / GCSE (Ages 14-16)•Infection and Responsebeginner

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Infection and Response: GCSE Biology Skills Builder

Key Stage 4 (ages 14–16) | Beginner level | AQA-style

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Instructions: Work through the activities in order, using the guidance to build confidence with key Infection and Response ideas. Read each question carefully and use the answer spaces provided; show working where a question asks you to calculate.

Pathogens: identify and describe

Use the word bank to complete the sentences. Each word is used once. Then answer the final question in a full sentence.

Word bank: bacteria, viruses, fungi, protists

1. Microscopic organisms that can reproduce inside host cells are called ___.

2. Some pathogens, such as yeast, belong to the group called ___.

3. The pathogen that causes malaria is a type of ___.

4. Many pathogens in this group are single-celled and may produce toxins: ___.

5. Explain one way a pathogen can be transmitted from one person to another.

The body’s defences

Recall the body’s non-specific defences and the immune response. Keep answers concise, but include key scientific terms where you can.

1. Describe how the skin helps to prevent pathogens entering the body.

2. Explain how mucus and cilia help defend the airways.

3. What is the role of white blood cells that produce antibodies?

4. Explain how antibodies help the body respond to a specific pathogen.

Vaccination and immunity

Use your knowledge of vaccination to answer each question. For the explain question, link the vaccine to the body’s response on later exposure.

1. What is introduced into the body in a vaccine to stimulate an immune response?

2. State the name of the cells that remain after an infection or vaccination and enable a faster response to the same pathogen.

3. Explain why a vaccinated person may produce antibodies more quickly when later exposed to the same pathogen.

4. State one reason why vaccination programmes can reduce the spread of an infectious disease in a population.

Antibiotics and treatment

Apply your understanding of antibiotics to the examples. Remember that antibiotics act against bacteria, not viruses.

1. A patient has influenza, which is caused by a virus. Explain why antibiotics will not treat the cause of this illness.

2. What is meant by antibiotic-resistant bacteria?

3. Describe one way the overuse or incorrect use of antibiotics can increase the spread of antibiotic resistance.

4. State one action that can help slow the development of antibiotic resistance.

Developing and testing a new drug

Use the information in the table. The dose that reduces bacterial growth most is the most effective in this test. Answer the questions using evidence from the data.

Drug dose (mg)	Mean bacterial growth (mm)	Number of repeats
0	18	3
5	12	3
10	6	3

1. Which tested dose produced the smallest mean bacterial growth?

2. Calculate the decrease in mean bacterial growth when the dose increases from 0 mg to 10 mg.

3. Why did scientists repeat each test three times?

4. State one further test needed before this drug could be offered to patients.

Drug development: explain the stages

Write one organised response. Use the prompts to structure your explanation: begin with laboratory research, then describe testing in people, and finish with why safety and effectiveness must be assessed.

Explain how a new medicine is developed and tested before it is made available to patients. Include laboratory testing, clinical trials and the use of a placebo or comparison group. [6 marks]

Answer Key

Activity 1: 1. viruses ; 2. fungi ; 3. protist ; 4. bacteria ; 5. For example, by droplets in the air when an infected person coughs or sneezes.

Activity 2: 1. The skin forms a physical barrier that prevents pathogens entering the body. ; 2. Mucus traps pathogens and cilia move the mucus towards the throat, where it can be swallowed. ; 3. They produce antibodies that bind to specific antigens on pathogens. ; 4. Antibodies bind to complementary antigens, helping to neutralise or destroy the pathogen.

Activity 3: 1. Antigens from a pathogen, often in a harmless or inactive form. ; 2. Memory cells. ; 3. Memory cells recognise the pathogen’s antigens and rapidly produce many specific antibodies, often destroying the pathogen before symptoms develop. ; 4. For example, fewer people become infected and pass the pathogen on, reducing transmission.

Activity 4: 1. Antibiotics target bacterial structures or processes; viruses reproduce inside host cells and are not affected by antibiotics. ; 2. Bacteria that are no longer killed or stopped from multiplying by one or more antibiotics. ; 3. Resistant bacteria survive treatment and reproduce; they can pass resistance on, so the resistant population becomes more common. ; 4. Use antibiotics only when prescribed and take them as directed.

Activity 5: 1. 10 mg. ; 2. 12 mm. ; 3. Repeats help identify anomalous results and calculate a more reliable mean. ; 4. For example, test for safety and effectiveness in clinical trials with human volunteers or patients, following appropriate earlier laboratory tests.

Activity 6: A suitable response explains that a potential medicine is first researched and tested on cells, tissues or organs in the laboratory, then tested on animals where appropriate to assess safety and dosage. Clinical trials in people begin with small numbers of healthy volunteers to assess safety and identify side effects; later trials use patients to test effectiveness and compare results with a placebo or existing treatment. Larger trials help identify less common side effects and establish an effective dose. Results are reviewed before approval for use.