VCE Biology Question Thread

[Reus]

Do mast cells initiate inflammation?

In a sense they are responsible for the allergic response, but specifically I guess histamine initiates it - mention both?

What end of DNA single strand (5' or 3') do primers bind to in Polymerase Chain Reaction?

5' to 3'

[TimewaveZero]

Do mast cells initiate inflammation?

Yes. Mast cells release histamine and this causes increased diameter and permeability of blood vessels leading to increased blood flow, heat, swelling. Platelets are also involved in wound healing and blood clotting.

[Reus]

A question myself, would the production of wastes/pollution that affects a particular species be considered an example of human-caused bottleneck?

[katiesaliba]

What end of DNA single strand (5' or 3') do primers bind to in Polymerase Chain Reaction?

Binds to the 3' end, but synthesises 5'-->3'

[akb]

ty for the hormone definition earlier!
just another question, what's the difference between hypersensitivity and a normal allergic response?

[Coralista]

Do mast cells initiate inflammation?

-Inflammation responses occurs when the area around the cut dilate
-The capillaries will become leaky leading to the build up of fluid in the inflamed tissue
-Mast cells are responsible for releasing histamines to cause local vasodilation and increased capillary permeability

So I wouldn't exactly say mast cells initiate inflammation, rather they are just a part of the response

[katiesaliba]

Airway constriction is a symptom of allergic response. Is this because vasodilation and permeable capillaries allow leukocytes to accumulate around the airways, thus constricting them?

What do we need to know about gene regulation?

-Inflammation responses occurs when the area around the cut dilate
-The capillaries will become leaky leading to the build up of fluid in the inflamed tissue
-Mast cells are responsible for releasing histamines to cause local vasodilation and increased capillary permeability

So I wouldn't exactly say mast cells initiate inflammation, rather they are just a part of the response

But mast cells release histamine which results in the characteristics of inflammation?

[Reus]

ty for the hormone definition earlier!
just another question, what's the difference between hypersensitivity and a normal allergic response?

Isn't hypersensitivity an allergic response?

[katiesaliba]

Isn't hypersensitivity an allergic response?

Yep, nuance!

[doomdestroyer]

A question myself, would the production of wastes/pollution that affects a particular species be considered an example of human-caused bottleneck?

I guess as long as the human waste/pollution causes a dramatic drop in allele frequencies in a population.

[Coralista]

Airway constriction is a symptom of allergic response. Is this because vasodilation and permeable capillaries allow leukocytes to accumulate around the airways, thus constricting them?

What do we need to know about gene regulation?

But mast cells release histamine which results in the characteristics of inflammation?

For gene regulation, I think we just need to know the 2 different types of regulator genes and how they function to "regulate" the genes haha.

In regards to the mast cell question, I thought the question was just asking what starts a inflammation response (as in what caused it in the first place e.g a paper cut)
Misinterpretation mistake, my bad.

[TimewaveZero]

Binds to the 3' end, but synthesises 5'-->3'

How does that work? Is the synthesis just an extension of the the primer? If it binds at the 3' end, wouldn't it have to go 3' --> 5'

[Tyleralp1]

Inflammation involves Basophils
Allergic Response is Mast Cells

[heymanhru]

How does that work? Is the synthesis just an extension of the the primer? If it binds at the 3' end, wouldn't it have to go 3' --> 5'

If it binds to the 3' end then the opposite strand has to be synthesised in a 5' to 3' direction as DNA is anti-parallel.

This image helped me get it  .

[vcestudent123]

How would you explain the steps of an allergic response?