Search our library of homework questions

Top answers

All subjects

All levels

I'm confused about the difference between active and passive immunity

Active immunity occurs when an individual develops immunity against a specific antigen when they are exposed to it - your body reacts by producing memory cells that provide long lasting immunity against t...

Answered by Sophie P. • Biology tutor

5824 Views

What's the difference between an antigen and an antibody?

An antigen is a substance that is introduced to the body and stimulates an immune response and the production of antibodies. Antibodies are proteins produced by cells in the body in in repsonse to the pre...

Answered by Sophie P. • Biology tutor

9425 Views

Explain the concept of price elasticity of demand.

Price elasticity of demand or PED is a very useful concept in microeconomics. In order to understand this, lets quickly talk about what demand is. Demand in economics refers to the willingness and ability...

Answered by Abheek D. • Economics tutor

6994 Views

What are the different types proteins in the body?

Proteins are polymers composed of amino acids (monomers) which are joined together. The shape of the protein has an impact on its role within the body. Muscles, hormones, antibodies and enzymes (biologica...

Answered by Abigail H. • Biology tutor

3365 Views

What is the difference between a divergent and convergent plate boundary?

A divergent (constructive) plate boundary is one where the two plates are moving APART from each other in opposite directions. As these plates move apart they create cracks in the earth's...

Answered by Abigail H. • Geography tutor

17794 Views