Biology Unit 3 Questions Megathread

[epinephrine]

What is a way of preventing bananas from ripening?

[lexitu]

Freeze the crap out of them so their metabolic rate goes down?

[vexx]

What is a way of preventing bananas from ripening?

inhibit the production of the gas hormone ethylene..
i guess a way of preventing it to ripen is putting it in a colder environment as gases diffuse slower in the cold.

[lexitu]

does the blood regulatory pathway have a 'control center' per se?

What did you mean by this? :S

[WhoTookMyUsername]

like, e.g. stimulus response model,

temp control center = hypothalmus

does blood regulatory control centre just pancreas? or is that not necessary in diagram,


also

should the negative feedback arrow go directly to the gland / receptor? (e.g. for BG, straight to islets?)

[lexitu]

I'm still not following, control centre that regulates what? There are many components to blood.. Check the VCAA assessment reports for a suggested way to draw negative feedback models.

[Keo]

Is it true that phagocytes are only within the bloodstream and macrophages are only outside the bloodstream?

[epinephrine]

Freeze the crap out of them so their metabolic rate goes down?

Haha thank you, and I thought that you could like put them in a vacuum like bag with a
compound that absorbs ethylene and then make that bag impermeable to oxygen
to so no respiration would occur, that work as well?

[person]

I know that an allergic reaction is stimulated by the overproduction of igE antibodies that bind to mast cells; but in a normal inflamation response do antibodies have anything to do with it or are the histamines produced without any antibodys binding to the mast cell?

[WhoTookMyUsername]

I'm still not following, control centre that regulates what? There are many components to blood.. Check the VCAA assessment reports for a suggested way to draw negative feedback models.

omg, if my communication systems are this bad tomorrow...

Blood GLUCOSE
regulatory system

:S

[lexitu]

Freeze the crap out of them so their metabolic rate goes down?

Haha thank you, and I thought that you could like put them in a vacuum like bag with a
compound that absorbs ethylene and then make that bag impermeable to oxygen
to so no respiration would occur, that work as well?

Yeah perfect mate, that's another thing that they use. By that sort of an answer you are demonstrating knowledge of quite a few concepts, good stuff.

[lexitu]

I'm still not following, control centre that regulates what? There are many components to blood.. Check the VCAA assessment reports for a suggested way to draw negative feedback models.

omg, if my communication systems are this bad tomorrow...

Blood GLUCOSE
regulatory system

:S

Oh haha Well check the VCAA exam report, I think it was 06-08 - the model is perfectly displayed there.

[Drunk]

"Cholesterol makes the cell membrane decrease the permeability of the bilayer to create small water-soluble molecules"

What does that mean? Does it mean that the membrane can form vesicles?

[WhoTookMyUsername]

I'm still not following, control centre that regulates what? There are many components to blood.. Check the VCAA assessment reports for a suggested way to draw negative feedback models.

omg, if my communication systems are this bad tomorrow...

Blood GLUCOSE
regulatory system

:S

Oh haha Well check the VCAA exam report, I think it was 06-08 - the model is perfectly displayed there.

yeah no control centre

[Russ]

Does it mean that the membrane can form vesicles?

How else would endocytosis happen?

Is it true that phagocytes are only within the bloodstream and macrophages are only outside the bloodstream?

Macrophages are phagocytes, so those two statements are mutually exclusive. Macrophages, however, are ONLY found in tissues (it's a great trick question)

I know that an allergic reaction is stimulated by the overproduction of igE antibodies that bind to mast cells; but in a normal inflamation response do antibodies have anything to do with it or are the histamines produced without any antibodys binding to the mast cell?

Doesn't have to be overproduction for mast cell binding. Normal inflammatory responses can cross link the IgE coating, yes. A normal inflammatory response, however, usually focus on other areas of the immune system