VCE Biology Question Thread

[RazzMeTazz]

Do antigen-presenting cells presenting antigens on their surface purely for T lymphocytes to bind to these antigens with?

[vox nihili]

Do antigen-presenting cells presenting antigens on their surface purely for T lymphocytes to bind to these antigens with?

Yep

[nerdmmb]

The difference between cell-mediated and humoral immune response..

Would this response be acceptable?
-Cell mediated immune response involves the action of the T Cells whereby T helper cells bind to the antigen fragment on macrophages and activate cytotoxic T cells whereas humoral response involves the production of antibodies against antigens by B Cells

[vox nihili]

The difference between cell-mediated and humoral immune response..

Would this response be acceptable?
-Cell mediated immune response involves the action of the T Cells whereby T helper cells bind to the antigen fragment on macrophages and activate cytotoxic T cells whereas humoral response involves the production of antibodies against antigens by B Cells

It's too verbose.

The cell mediated response involves T-cells whereas the humoural response primarily involves antibodies, which are produced by B-cells.

[Jason12]

what is an attenuated virus and what are the effects on humans when a vaccine is made using an attenuated virus?

[RazzMeTazz]

What is the role of monocytes before they become macrophages?

Are they phagocytic, when they circulate in the bloodstream before becoming macrophages?

[Jason12]

do we need to know about why it is difficult to treat viruses with drugs or what drugs help prevent tissue rejection? Or any drug information in the immune response?

[RazzMeTazz]

Would it be correct to say that repeated exposure to an allergen, causes a more severe allergic response  each consecutive time, due to the presence of an increased number of mast cells, hence greater amounts of histamines are produced, which increase the overall allergic response?

Also does the heparin that mast cells have, play a role in inducing the effects of an allergic response, or is it only the histamines?

Thanks!

[RazzMeTazz]

Are basophils also involved in producing histamines to produce an allergic response?

Not just histamines?

Thanks!

[Reus]

Are basophils also involved in producing histamines to produce an allergic response?

Not just histamines?

Thanks!

Yes they secrete the chemical histamine, circulating in the blood and respond to inflammatory and allergic reactions.

[vox nihili]

what is an attenuated virus and what are the effects on humans when a vaccine is made using an attenuated virus?

Attenuated just means a virus that can't cause disease. It's had the punch taken out of it. Vaccines of this type prime the immune system just as any other vaccine does.

[Shenz0r]

Attenuated just means a virus that can't cause disease. It's had the punch taken out of it. Vaccines of this type prime the immune system just as any other vaccine does.

Well, sort of - attenuated just means the virulence of the virus is weakened. There is still a chance that the attenuated vaccine can revert virulence but chances are very low.

If you want to completely get a vaccine that is completely safe, you'd use a dead/inactivated virus

[vox nihili]

Well, sort of - attenuated just means the virulence of the virus is weakened. There is still a chance that the attenuated vaccine can revert virulence but chances are very low.

If you want to completely get a vaccine that is completely safe, you'd use a dead/inactivated virus

In its attenuated form, the virus doesn't cause disease. The whole point of attenuation is allow mutations to occur that knock out virulence factors. The only time a virus will revert to virulence is if its genome is able to recombine with that of another virus so that the virulence factors can be restored.

[RazzMeTazz]

Do we need to know about monoclonal antibodies?

[nerdmmb]

What difference is there between an immune response against viruses and bacteria?