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March 29, 2024, 01:26:30 am

Author Topic: VCE Biology Question Thread  (Read 3570599 times)  Share 

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vox nihili

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Re: VCE Biology Question Thread
« Reply #510 on: February 08, 2014, 06:19:25 pm »
+1
Are all hormones made of proteins?

No. Some are steroid based: corticosteroids for example.
Some are amino acids: thyroxine for example.
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MM1

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Re: VCE Biology Question Thread
« Reply #511 on: February 08, 2014, 09:59:01 pm »
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Do we have to know about the different types of microtubules/filaments and cell junctions?

popoy111

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Re: VCE Biology Question Thread
« Reply #512 on: February 08, 2014, 10:01:10 pm »
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List and explain the factors that affect the rate of diffusion of substances across membranes.

alchemy

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Re: VCE Biology Question Thread
« Reply #513 on: February 08, 2014, 10:10:56 pm »
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Do we have to know about the different types of microtubules/filaments and cell junctions?
Apparently not MM1...

List and explain the factors that affect the rate of diffusion of substances across membranes.
Temperature - A greater temperature increases the kinetic energy of molecules allowing them to diffuse across the membrane faster.
Concentration gradient - A greater concentration gradient would mean solutes are naturally more inclined to travel from regions of their high concentration to regions of their low concentration
Surface Area - Membranes with more surface area allow more molecules to diffuse per unit of time.

vox nihili

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Re: VCE Biology Question Thread
« Reply #514 on: February 09, 2014, 12:51:02 am »
+1
Temperature - A greater temperature increases the kinetic energy of molecules allowing them to diffuse across the membrane faster.
Concentration gradient - A greater concentration gradient would mean solutes are naturally more inclined to travel from regions of their high concentration to regions of their low concentration
Surface Area - Membranes with more surface area allow more molecules to diffuse per unit of time.

Not to forget the nature of the substance itself, such as size and polarity as well as characteristics of the membrane as well.

Those very largely are what people want you to remember though, so you've definitely hit the right ones there.
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slothpomba

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Re: VCE Biology Question Thread
« Reply #515 on: February 09, 2014, 09:11:03 am »
+1
Do we have to know about the different types of microtubules/filaments and cell junctions?

I don't anticipate that'll come up in a VCE level, it's more of a second year uni thing.

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Reus

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Re: VCE Biology Question Thread
« Reply #516 on: February 09, 2014, 11:30:41 am »
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Brief points that need to be known (main components), before doing the membrane PRAC/SAC?
Thanks!
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #517 on: February 09, 2014, 11:40:14 am »
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What should we write to describe the process leading up and including the denaturation of an enzyme? Are there any particular terms that we should use?
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slothpomba

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Re: VCE Biology Question Thread
« Reply #518 on: February 09, 2014, 11:47:35 am »
+1
What should we write to describe the process leading up and including the denaturation of an enzyme? Are there any particular terms that we should use?

Have a go first and i'll tell you if you're correct.

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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #519 on: February 09, 2014, 11:56:54 am »
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How would you define a glycoprotein?

I always get glycolipids and glycoproteins confused :S

slothpomba

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Re: VCE Biology Question Thread
« Reply #520 on: February 09, 2014, 12:03:56 pm »
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How would you define a glycoprotein?

I always get glycolipids and glycoproteins confused :S

Break down the words - glycolipids and glycoproteins

Hell, even remove the glyco bit for now. What do we wind up with? lipids and proteins. You probably know what those are, so, it wouldn't be too hard to tell the difference between a glycoprotein and a glycolipid. A definition can be found on the net or in the appendix of your book(s).

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alchemy

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Re: VCE Biology Question Thread
« Reply #521 on: February 09, 2014, 03:59:24 pm »
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How would you define a glycoprotein?

I always get glycolipids and glycoproteins confused :S

For examples: Glycolipids can be found on the top or extracellular side of the plasma membrane. They are the least common of membrane proteins (~2%). Many integral proteins can be glycoproteins that span through the membrane.

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #522 on: February 09, 2014, 04:10:28 pm »
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Break down the words - glycolipids and glycoproteins

Hell, even remove the glyco bit for now. What do we wind up with? lipids and proteins. You probably know what those are, so, it wouldn't be too hard to tell the difference between a glycoprotein and a glycolipid. A definition can be found on the net or in the appendix of your book(s).

Thanks! :)

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #523 on: February 09, 2014, 04:11:15 pm »
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For examples: Glycolipids can be found on the top or extracellular side of the plasma membrane. They are the least common of membrane proteins (~2%). Many integral proteins can be glycoproteins that span through the membrane.

Thankyou! :)

nerdmmb

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Re: VCE Biology Question Thread
« Reply #524 on: February 09, 2014, 04:21:03 pm »
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So how are bio sacs anyways.
Are they like normal tests?