74302
Descripción
Fichas por BubbleandSqueak, actualizado hace más de 1 año
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Creado por BubbleandSqueak
hace casi 11 años
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| Pregunta | Respuesta |
| In some countries, polio is still common. Give two advantages of continuing with a polio immunisation programme in the UK. | 1. Possibility of introduction of virus from abroad. 2.Spread limited if most people are immune. |
| Food will keep longer if its placed in a refrigerator at 2°C. Refrigeration doesn't kill bacteria. What does the low temperature do to bacteria? | It is too cold for the bacteria to divide or reproduce. |
| Most drugs that kill bacteria cannot be used to treat viral infections. Explain why. | Because viral infections get into your cells and multiply. To destroy to virus, you would have to destroy your cell. |
| Explain why a mutation of the Influenza virus might cause another Influenza pandemic. | The virus' antigens change. The vaccine is not effective. The antigens are not recognised by the WBC's antibodies. People travel abroad & spread the infection. |
| Antibiotics are now used in hospitals. What is an antibiotic and what does it do? | They are a type of drug. They can only kill bacteria. |
| MRSA is causing problems in hospitals. Give one reason why. | It has become resistant to antibiotics. |
| How can the work of Semmelweiss help to reduce the problems caused by MRSA? | Washing hands reduces spread of infection between doctors and patients. |
| Describe how a student could test for carbon dioxide. Give the result of the test. | Add to limewater and see if the water turns cloudy/murky. |
| Name four properties of transition metals. | 1. Conducts heat. 2. Forms coloured compounds (fireworks) 3. High melting points. 4. Strong |
| The use of titanium is limited because it is expensive. Explain why titanium costs more than steel. | 1. Large amounts of energy must be used. 2. There are lots of steps involved. 3. Only produces a small amount of titanium. |
| A new way to extract copper from land that contains low percentages of copper sulphide is phytomining. Give to advantages of phytomining over the traditional method (2) | 1.Burning the plants produces heat 2. It costs less than the traditional method |
| Some slimming programmes include daily exercise. Explain how daily exercise helps a person lose mass/weight. | Daily exercise helps a person to lose mass because they are burning the calories they take in and their metabolic rate increases/their cells respire faster. |
| What type of chemical is released by some white blood cells to attack viruses. | ANTIBODIES!!! |
| Hepatitis B is more likely to be spread among people who share needles when they inject drugs. Why is this so? | Because the virus is found in body fluids and blood would be on the needle meaning it would spread. |
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