Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017 - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1
Question 9
Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017.
| sexually transmitted infection (STI) | number of... show full transcript
Worked Solution & Example Answer:Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017 - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1
Step 1
State the sexually transmitted infection that has the median number of people diagnosed.
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Answer
The sexually transmitted infection that has the median number of people diagnosed is genital warts, as it has a higher count than syphilis and a lower count than chlamydia.
Step 2
Calculate the total number diagnosed with chlamydia in the UK in 2017.
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Answer
To calculate the total number diagnosed with chlamydia, we can use the formula:
State why chlamydia can be described as a communicable disease.
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Answer
Chlamydia can be described as a communicable disease because it can be transmitted from one person to another through sexual contact.
Step 4
Give one way the transmission of chlamydia can be prevented.
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Answer
One way to prevent the transmission of chlamydia is to use condoms during sexual intercourse.
Step 5
Explain why chlamydia can be treated with antibiotics.
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Chlamydia can be treated with antibiotics because it is caused by a bacterial infection, and antibiotics are effective in targeting and killing bacteria.
Step 6
Explain how the immune system will respond to an infection caused by bacteria.
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When a person is infected with bacteria, the immune system activates a response that typically involves the following steps:
Recognition: Antigens on the bacteria are recognized by white blood cells (WBCs), such as macrophages and lymphocytes.
Activation: This recognition leads to the activation of WBCs, which results in an increase in their numbers and the production of specific antibodies.
Response: As a part of the immune response, lymphocytes produce antibodies that surround and neutralize the bacteria, preventing them from causing further harm.
Memory Formation: After the infection is cleared, memory lymphocytes are formed, which remain in the body. If a secondary infection occurs, these memory cells respond more rapidly and effectively, leading to a quicker resolution of the infection.
