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When an antigen binds to a receptor on a T cell, the T cell becomes activated and differentiates into different types of T cells. What are these T cells and what are their functions? (6 marks)

There are three main types of T cell. T helper (CD4+), T killer (CD8+) and T memory. The CD4+/8+ are complex proteins on the surface of each respective T cell that they use in their function. T helper cells ...
ZM
Answered by Zachary M. • Biology tutor
4213 Views

From the definition of the decay constant for nuclear decay, derive the exponential decay equation.

By definition, dn/dt = - λ N , If you separate the variables which contain N and t, and then integrate w.r.t N and w.r.t t you get, lnN = -λt + C (1), To find the constant of integration, solve (1) by settin...
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Answered by Jake P. • Physics tutor
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What are the main characteristics of the phospholipid bilayer?

The phospholipid bilayer is the main component of the plasma membrane. Phospolipids consist of two parts with different properties. One part is often referred to as 'head' or 'water-loving', which is hydroph...
AN
Answered by Anna N. • Biology tutor
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What about simultaneous equations?

They are equations with variables that we have to find. They hold in the same time.
SO
Answered by Stefan O. • Maths tutor
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How should I improve my portfolio in order to achieve an A/A*?

In order to achieve the highest marks possible in A Level Fine Art, you must continuously make sure that you are hitting all of the Assessment Objectives (AOs) at different stages along your path. This can m...
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Answered by Deniz D. • Art tutor
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