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March 29, 2024, 01:26:56 pm

Author Topic: VCE Biology Question Thread  (Read 3571207 times)  Share 

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MM1

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Re: VCE Biology Question Thread
« Reply #720 on: February 20, 2014, 11:20:40 pm »
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In the secondary structure, the polypeptide chain undergoes coiling (alpha helices) and folding (beta sheets) due to hydrogen bonding between the different amino acids.

Is this hydrogen bonding between the R groups of the amino acids?

Thanks!

No, the R group interactions are only for the tertiary structure, I believe.
In the secondary structure, the hydrogen bonds form between the  C=O and H-N (carbonyl and amide), or just say segments on the chain.

nerdmmb

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Re: VCE Biology Question Thread
« Reply #721 on: February 20, 2014, 11:23:35 pm »
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No, the R group interactions are only for the tertiary structure, I believe.
In the secondary structure, the hydrogen bonds form between the  C=O and H-N (carbonyl and amide), or just say segments on the chain.

Carboxyl*
Amine*

MM1

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Re: VCE Biology Question Thread
« Reply #722 on: February 20, 2014, 11:28:45 pm »
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Carboxyl*
Amine*

It is actually Carbonyl and Amide in this case. Although I do see what you mean. Do you want an explanation?

nerdmmb

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Re: VCE Biology Question Thread
« Reply #723 on: February 20, 2014, 11:38:13 pm »
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It is actually Carbonyl and Amide in this case. Although I do see what you mean. Do you want an explanation?

That's fine. I never knew they existed though; was in the context of amino acids.

MM1

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Re: VCE Biology Question Thread
« Reply #724 on: February 20, 2014, 11:40:47 pm »
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That's fine. I never knew they existed though; was in the context of amino acids.

Still is about amino acids but in their peptide form. None of this is needed for VCE Biol though.

grannysmith

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Re: VCE Biology Question Thread
« Reply #725 on: February 21, 2014, 07:26:03 am »
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I've read the Biology FAQS and I was surprised to see that you do not need to know the different types of bonding.

From VCAA:
"The names for the specific types of bonds (for example, glycosidic, peptide) or bonding (for example hydrogen, covalent, disulfide) in carbohydrates, lipids, proteins and nucleic acids are not required."

So essentially (and correct me if I'm wrong), you only need to know that 'bonding' occurs to help form the conformational shape of a protein and each level of structure (primary, secondary, tertiary, quaternary). You could perhaps refer to these as 'intermolecular' bonds or attractions.

Of course, it's still good to know the different types of bonds :)

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #726 on: February 21, 2014, 05:02:01 pm »
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Can someone please explain to me what the terms  'control' and 'variable' mean, when referring to a scientific experiment?

Thanks!  :)

nhmn0301

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Re: VCE Biology Question Thread
« Reply #727 on: February 21, 2014, 05:12:18 pm »
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Can someone please explain to me what the terms  'control' and 'variable' mean, when referring to a scientific experiment?

Thanks!  :)
Variable - a factor that can impact on the outcome of the experiment
There are 2 types of variables:  Independent variable (one that is deliberately changed)
Dependent variable (one that is changed due to the change in Independent variable)
Controlled: usually "controlled experiment" which refers to an experiment in which everything is keep at constant and does not change EXCEPT only the independent and dependent variable. This helps to validate the changes those above variables really have an effect but not the other.
Hope this helps.
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grannysmith

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Re: VCE Biology Question Thread
« Reply #728 on: February 21, 2014, 05:44:43 pm »
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Would active transport be considered as the net movement of particles or not?

howlingwisdom

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Re: VCE Biology Question Thread
« Reply #729 on: February 21, 2014, 05:52:24 pm »
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Would active transport be considered as the net movement of particles or not?
Yes, but remember that it occurs against the concentration gradient thus requiring the expenditure of energy in the form of ATP for it to occur.
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vox nihili

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Re: VCE Biology Question Thread
« Reply #730 on: February 21, 2014, 07:26:34 pm »
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Would active transport be considered as the net movement of particles or not?

Absolutely. You're always talking about net movement. There is no naturally occurring (or for that matter unnaturally occurring) instance when particles aren't moving at all.
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #731 on: February 21, 2014, 09:16:27 pm »
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If I were to define endosmosis and exosmosis, could I just say that endosmosis is the net movement of water, across a differentially permeable membrane into a cell and that exosmosis is the net movement of water across a differentially permeable membrane, out of a cell?

I am not sure if that is right or wrong :/

Thanks!

vox nihili

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Re: VCE Biology Question Thread
« Reply #732 on: February 21, 2014, 09:25:02 pm »
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If I were to define endosmosis and exosmosis, could I just say that endosmosis is the net movement of water, across a differentially permeable membrane into a cell and that exosmosis is the net movement of water across a differentially permeable membrane, out of a cell?

I am not sure if that is right or wrong :/

Thanks!

That's right, but nobody really uses these terms anyway.
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #733 on: February 21, 2014, 10:06:11 pm »
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That's right, but nobody really uses these terms anyway.

oh thanks!

Rishi97

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Re: VCE Biology Question Thread
« Reply #734 on: February 21, 2014, 10:07:29 pm »
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What is the definition of osmosis? Do I need to include info about the semi permeable membrane?
Thanks in advance :D
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