HIV (Human Immunodeficiency Virus) is a pathogen - AQA - GCSE Biology - Question 1 - 2010 - Paper 1
Question 1
HIV (Human Immunodeficiency Virus) is a pathogen.
0.1.1 How is HIV spread from one person to another? Tick (✓) one box.
Coughing
Sexual intercourse
Touching door... show full transcript
Worked Solution & Example Answer:HIV (Human Immunodeficiency Virus) is a pathogen - AQA - GCSE Biology - Question 1 - 2010 - Paper 1
Step 1
How is HIV spread from one person to another?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
HIV is primarily spread through sexual intercourse. This mode of transmission is the most significant, as it involves the exchange of bodily fluids, which may contain the virus.
Step 2
Describe what happened to the number of new cases of HIV from 2010 to 2018.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
From 2010 to 2014, the number of new HIV cases increased initially, reaching a peak of 2767 cases in 2014. However, this number then decreased to 1530 cases by 2018, indicating an overall decline in new cases from 2014 onwards.
Step 3
What could cause a decrease in the number of new HIV cases in the future?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Better education on how to prevent the spread of HIV could be effective in reducing new cases. Increasing awareness and understanding of HIV transmission methods and safe practices can lead to safer behaviors.
Step 4
How could a vaccine work to prevent a person being infected with HIV?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct order of stages is: C → E → A → B → D. Initially, an inactive form of the virus is injected into the body. Following this, white blood cells produce antibodies to combat the inactive virus. Antibodies then attach to and destroy the inactive virus. If the active virus enters the body later, antibodies are produced quickly, providing protection.
Step 5
What is the next stage in testing the vaccine?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The next stage in testing the vaccine is on healthy volunteers. This step is crucial to assess the vaccine's effectiveness and safety in a controlled human setting.
Step 6
Why is it difficult to develop safe drugs to destroy viruses?
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
It is difficult to develop safe drugs to destroy viruses because the drugs that destroy viruses also damage body tissues. This challenge affects the safety and efficacy of antiviral drugs.
Step 7
Draw one line from each drug to the plant the drug originated from.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Aspirin originates from Foxglove, and Digitalis comes from Willow.
