Biology Unit 3 Questions Megathread

[WhoTookMyUsername]

Do B plasma cells secrete antibodies into lymph fluid or do they move to site of infection before they secrete?

Also

does 1 b lympocyte have the ability to secrete all classes ( or more than 1 ) class of antibodies ? ( e.g. IgA IgG)
thanks

Urgent response for SAC please

[Inside Out]

im pretty sure the B cells release the anitbodies directly into the lymph fluid and each B cell and anitbody is specific... so im assuming that they react specifically to the antigen- so can only release one specific antibody

[Inside Out]

do neutrophils only work on bacteria?

[Kaille]

are t helper cells part of the humoral response?

[Russ]

Neutrophils don't work *only* on bacteria but that would be their main target.
Th cells aren't humoral but they aid the humoral response. They span humoral and CMI (IMO)

Do B plasma cells secrete antibodies into lymph fluid or do they move to site of infection before they secrete?

Into circulation, they don't head to the site of infection, they migrate to the bone marrow and reside there.

does 1 b lympocyte have the ability to secrete all classes ( or more than 1 ) class of antibodies ? ( e.g. IgA IgG)
thanks

All B cells initially secrete IgM and have the potential to switch to other types. Once they switch (IgM -> IgG) they can't switch back

[Lesliel1]

are t helper cells part of the humoral response?

i think they are because they are needed to activate the B cells by secreting interleukin 2 so that the B cell can proliferate in memory and plasma B cells

[Lesliel1]

whats the difference between the cytosol and the cytoplasm?

[WhoTookMyUsername]

Cytosol = fluid inside cells excluding nucleus
Cytoplasm = whole cell except nucleus

[HERculina]

how are primary hosts different to secondary hosts.
is it primary host = parasite reproduces sexually, secondary host = reproduces asexually or the other way around? the lifecycle diagrams confuse me

[kaushik]

Primary host simple means a host that is used to carry the adult stage of the parasite, which can obviously reproduce sexually
whereas the secondary host refers to the host that carries the larval stage of the parasite - so reproduces asexually.

[HERculina]

oh thanks
but how does this work with malaria. if the mosquito is the secondary host why does sexual reproduction occur within it (the zygote forms as a result)

[Russ]

What makes you think the mosquito is the secondary host?

[HERculina]

isnt it?
it says in my book that it is

EDIT: google just confirmed that im wrong. ok, now i get it

[Charmz]

Mosquitoes aren't a host for plasmodium are they? Aren't they just the vector? Because plasmodium doesn't harm the mosquito?

[lexitu]

They are primary hosts and (I'm pretty sure) they are also vectors. "Host" status doesn't mean they have to be harmed, this can be seen in mutually beneficial relationships.