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15. Drugs
A section of Biology, 0610
Listing 10 of 89 questions
Chlamydia is a sexually transmitted infection (STthat is caused by a bacterium. shows the number of chlamydia cases in a country in 2018. 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65+ age group / years cases per 100 000 people Calculate the percentage decrease in the number of chlamydia cases between the age groups 20–24 and 25–29. Give your answer to two significant figures. Space for working. % Describe how the spread of STIs, such as chlamydia, can be controlled. Chlamydia can damage the reproductive system. State the name of the part of the female reproductive system that produces oestrogen. Describe the role of oestrogen at puberty. Complete the sentences about drug resistance and genetic variation by writing a suitable word or phrase in the spaces provided. Bacteria can be killed by drugs called . The development of strains of bacteria that are resistant to these drugs is an example of selection. Resistant strains of bacteria have gene mutations that enable them to survive drug treatment. Gene mutations are caused by random changes in the of bases in DNA and result in the formation of new in the bacteria. Mutation rates can be increased by radiation and some chemicals. In animals and plants, another source of genetic variation is a type of nuclear division called .
0610_w24_qp_41
THEORY
2024
Paper 4, Variant 1
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Questions Discovered
89