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March 29, 2024, 04:31:18 am

Author Topic: VCE Biology Question Thread  (Read 3570765 times)  Share 

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Spxtcs

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Re: VCE Biology Question Thread
« Reply #4785 on: March 05, 2015, 06:42:11 pm »
+1
Woops, i was meant to say the opposite. What would be the word when a cell doesnt quite lyse yet, is there a term to describe it? I know its turgid for a plant cell, but animals?

Probably just 'swollen'/also known as 'cytolysis', where the cell eventually bursts (since turgid refers to a similar concept).

cosine

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Re: VCE Biology Question Thread
« Reply #4786 on: March 05, 2015, 06:47:38 pm »
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Thanks

What is turgor pressure do? Is it used in any way?
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StupidProdigy

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Re: VCE Biology Question Thread
« Reply #4787 on: March 05, 2015, 06:59:38 pm »
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Well,

The fluid mosaic model describes a phospholipid bilayer with embedded proteins. Such a structure contains phospholipids with hydrophobic heads and phospholipid tails, allowing lipid soluble substances to pass through the membrane with ease. However, larger molecules need to enter the cell via other methods, and this is where the role of proteins is vital, with features such as protein channels and carrier proteins becoming essential in ensuring passage for certain substances across the membrane. As you can see, this selective permeability can be owed to the fluid mosaic model of the membrane, tying your two points together.

I hope that's what you were asking  ;D

Thank-you so much!! Extremely concise and it really sunk in well for me :))
Just wondering, should word I made bold be hydrophilic??
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Spxtcs

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Re: VCE Biology Question Thread
« Reply #4788 on: March 05, 2015, 07:01:49 pm »
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Thanks

What is turgor pressure do? Is it used in any way?

it's pretty much caused by osmosis in plant cells. It's the water pressure inside the plant cell that causes the cell membrane to be pushed outwards towards the cell wall, causing turgidity. I don't think it's that important but just be aware of it. Doubt they'd ask 'what is turgor pressure', but if they do, at least you'll have an idea :D

bae

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Re: VCE Biology Question Thread
« Reply #4789 on: March 05, 2015, 07:04:28 pm »
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Whoops sorry typing error haha, it's meant to be hydrophilic heads and hydrophobic tails. I'll edit my post.
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StupidProdigy

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Re: VCE Biology Question Thread
« Reply #4790 on: March 05, 2015, 07:08:54 pm »
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Whoops sorry typing error haha, it's meant to be hydrophilic heads and hydrophobic tails. I'll edit my post.
Yeah thought it was just a typo, thanks again though, +1'ed
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StupidProdigy

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Re: VCE Biology Question Thread
« Reply #4791 on: March 05, 2015, 07:45:11 pm »
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Can anyone help with this (picture attachment)
I've read over and over and all I can think of is that glucose being a monosaccharide and starch being a polysaccharide would be important to talk about? Any guidance or answer would be really appreciated :)
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amhk

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Re: VCE Biology Question Thread
« Reply #4792 on: March 05, 2015, 07:47:45 pm »
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Can anyone explain why the cell walls are freely permeable relating to its structure?

cosine

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Re: VCE Biology Question Thread
« Reply #4793 on: March 05, 2015, 08:15:23 pm »
+1
Could this be a source of error for the osmosis sac:

The mass of the eggs may be not be accurate as oxygen from the atmosphere is able to diffuse into it, causing an altercation in the masses?
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Cogglesnatch Cuttlefish

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Re: VCE Biology Question Thread
« Reply #4794 on: March 05, 2015, 08:22:59 pm »
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Could this be a source of error for the osmosis sac:

The mass of the eggs may be not be accurate as oxygen from the atmosphere is able to diffuse into it, causing an altercation in the masses?
does that sound logical to you?
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cosine

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Re: VCE Biology Question Thread
« Reply #4795 on: March 05, 2015, 08:23:49 pm »
+1
does that sound logical to you?

If i knew i wouldn't be asking AtarNotes, now, would I?
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Cogglesnatch Cuttlefish

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Re: VCE Biology Question Thread
« Reply #4796 on: March 05, 2015, 08:28:12 pm »
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Could this be a source of error for the osmosis sac:

The mass of the eggs may be not be accurate as oxygen from the atmosphere is able to diffuse into it, causing an altercation in the masses?
i would say something else. It's just like saying " the mass of the eggs may not be accurate as a fly landed on the scale when you were weighing them"- you are over-thinking it.

If you can provide a brief outline of your experiment i could help you
« Last Edit: March 05, 2015, 08:33:15 pm by Cogglesnatch Cuttlefish »
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MagicGecko

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Re: VCE Biology Question Thread
« Reply #4797 on: March 05, 2015, 10:58:25 pm »
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Can anyone help with this (picture attachment)
I've read over and over and all I can think of is that glucose being a monosaccharide and starch being a polysaccharide would be important to talk about? Any guidance or answer would be really appreciated :)

Yeah, knowing that Glucose is a monosaccharide and Starch being a polysaccharide is a good start. Now think about the role Starch plays in plants, and apply that to the potato tuber cells.
 
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Reus

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Re: VCE Biology Question Thread
« Reply #4798 on: March 05, 2015, 11:08:44 pm »
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Could this be a source of error for the osmosis sac:

The mass of the eggs may be not be accurate as oxygen from the atmosphere is able to diffuse into it, causing an altercation in the masses?
This is quite vague. Just make mentions of inaccurate result collection as human-made errors are inevitable. Moreover other errors can be made due to the incompetency of the naked eye at a molecular level. Using the apparatus incorrectly, misreading the results etc...
i would say something else. It's just like saying " the mass of the eggs may not be accurate as a fly landed on the scale when you were weighing them"- you are over-thinking it.

If you can provide a brief outline of your experiment i could help you
This is okay but the fly situation is quite objective and you would rather want to say "to prevent the error of inaccurate/unreliable results in future experiments the isolation of the eggs is paramount. Furthermore repetition of the practical will minimise the level of inaccuracy.  :)
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cosine

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Re: VCE Biology Question Thread
« Reply #4799 on: March 06, 2015, 08:45:41 pm »
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What exactly goes into a conclusion of a prac report?

Is it true we need to reinstate our hypothesis and further expand on it?
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