Which bits of the antibody 'recognise' the 'bar-codes' on the bacteria, and therefore bind with them

Which bits of the antibody ‘recognise’ the ‘bar-codes’ on the bacteria, and therefore bind with them
plz help me with my hw i dnt get it

Best answer:

It’s a lot easier to think of antibodies and their antigens (the bits that antibodies bind to) like a lock and key or even a pair of hands on the ends of a Y-shaped arm.

Your question can be answered on several levels depending on how much technical detail you need.

Simply, the “antigen binding domains” recognise the antigen (sorry, I just can’t bring myself to call it a bar-code, that is really simplifying it TOO far!). If you picture the antibody as a Y-shape, it is the parts at the top of the Y.

The next level: These are called the variable domains. They are variable because of the way antibodies are generated from gene segments.

The next level: The part that binds to the antigenic epitope is called the hypervariable region or complementarity determining region. It is generated partly owing to the splicing or recombination of the gene segments, and partly due to somatic mutation as the B cells (the cells that produce antibody) mature. The antibody and antigenic epitope (epitope is the part of the antigen that comes in contact with the antibody) interact partly due to the shape and partly due to the electrostatic charges on the atoms of that part of the proteins.

It actually gets a whole lot more complicated than that, but I’m pretty sure that should do for your homework!

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