THE HUMAN IMMUNE SYSTEM
IMMUNE RESPONSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In Florey and Chain’s experiment, eight mice were infected with lethal doses of Streptococcus bacteria. The four micegiven penicillin survived, but the untreated mice died. What can be concluded from these results?
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The experiment should be repeated with more mice.
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There is a causal relationship between the use ofpenicillin and antibiotic resistance in bacteria.
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Penicillin can be used to treat bacterial infectionsin humans.
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Penicillin may have played a role in the recovery ofthe four mice.
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Explanation:
Detailed explanation-1: -Viruses and bacteria also have a different structure and a different way of surviving. Viruses are surrounded by a protective protein coating; they don’t have cell walls that can be attacked by antibiotics like bacteria does. It is because of this that antibiotics don’t work on viruses.
Detailed explanation-2: -What is the position of heart valves when blood pressure is highest in the aorta? The valves that separates the atria from the ventricles.
There is 1 question to complete.