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Scientists find links between diseases and their causes. The information is used to reduce the number of people with the disease by giving lifestyle advice or developing new ways to fight the disease.
What does correlation mean?
As one variable changes there is no link with another variable
As one variable changes, another variable also changes
As one variable increases, there is no change with the other variable
Which of these describes a causal mechanism for lung cancer?
As the number of cigarettes smoked increases, the number of cases of lung cancer increases
All parts of cigarette smoke cause everybody to always develop lung cancer.
The number of cases of lung cancer increased because the patients had been exposed to carcinogens in the cigarette smoke
Insulin can be made by genetic modification of bacteria in order to treat which disease?
Type 1 diabetes
Which of these correctly describes the correlation shown in the graph?
As the number of cigarettes smoked increases, the number of deaths from cancer increases
As the number of cigarettes smoked decreases, the number of deaths from cancer increases
As the number of cigarettes smoked increases, the number of deaths from cancer decreases
What is an advantage of using a patient's own stem cells to grow a heart that could be used to treat heart failure?
The stem cells have to be extracted from an embryo
A donor heart has to be found
The heart will not be rejected by the patient's immune system
Name two risk factors for developing type 2 diabetes.
Smoking and drinking alcohol
Poor diet and lack of exercise
Carcinogens and ionising radiation
What effect could smoking during pregnancy have on a newborn baby?
Baby born overweight
Respiratory infection in newborn baby
Stimulated intellectual development
How does alcohol affect brain function?
Increase brain size
Speeds up reaction times
Causes impaired memory
What does the 'incidence of a disease' mean?
The likelihood of developing the disease in the population
The number of cases of the disease in the population
The number of cases of the disease ever recorded
What was one of the aims of the Human Genome Project?
To treat all of the diseases in the world that we know about
To work out the order or sequence of all the three billion base pairs in the human genome
To slow down the rate of DNA sequencing