Top answers

How does vaccination confer immunity to a person?

The dead or inactive form of the pathogen stimulates the adaptive immune system. It forces white blood cells to form antibodies against the pathogen, so that if a future invasion by the same pathogen was to ...
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Answered by Anushka J. • Biology tutor
3049 Views

How do you best write one or multiple effective essays within the time constraints of an exam?

I believe that a common misconception exists among students taking exams for IB History (as well as related subjects) that it is best to allocate the entirety of the exam to just writing continuously. In my ...
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Answered by Joey W. • History tutor
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Q4: Some small organisms do not have a specialised gas exchange system like humans. Instead they absorb oxygen through their skin. What is this process called? • Transpiration • Respiration • Diffusion • Photosynthesis

The answer is Diffusion. This is random movement of a substance from an area of high concentration (the air) to a region of low concentration (inside the organism). In this case, the substance diffusing woul...
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Answered by Rebecca T. • Biology tutor
3991 Views

What are the four stages of mitosis and what characteristic events occur within the cell at each stage?

Mitosis is the division of one cells contents to either side of the cell in preparation for cytokinesis which is the splitting of one cell into two identical, diploid, daughter cells. The four stages of mito...
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Answered by Olivia G. • Biology tutor
7272 Views

Find the minimum value of the function, f(x)= x^2 + 5x + 2, where x belongs to the set of Real numbers

We first differentiate f(x), and we get f'(x)=2x + 5. We then set this equal to 0 and then solve for x. We get that xmin= -2.5. We check whether this was indeed a minimum, by calculating the second derivativ...
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Answered by Pavlos P. • Maths tutor
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