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March 29, 2024, 01:33:46 am

Author Topic: VCE Biology Question Thread  (Read 3570605 times)  Share 

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Rishi97

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Re: VCE Biology Question Thread
« Reply #3060 on: September 27, 2014, 09:10:07 am »
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Describe 3 situations where only very small DNA samples may be available for sampling and PCR can be used
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Reus

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Re: VCE Biology Question Thread
« Reply #3061 on: September 27, 2014, 09:32:49 am »
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Describe 3 situations where only very small DNA samples may be available for sampling and PCR can be used
-  In crime scene investigations. Availability of small samples of blood; to get a DNA fingerprint of the person whose blood it is.
   This may also include semen investigation for a rape victim (people generally hear crime and think blood.)
-  Archaeological and/or paleontological investigations.
-  Paternity testing.
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #3062 on: September 27, 2014, 09:59:48 am »
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Would ADP/ATP and NAD/NADH

be considered nucleic acids?

psyxwar

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Re: VCE Biology Question Thread
« Reply #3063 on: September 27, 2014, 10:02:53 am »
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Would ADP/ATP and NAD/NADH

be considered nucleic acids?
No, I wouldn't consider them nucleic acids but only because nucleic acids are, by definition, large macromolecules. ADP/ATP is a nucleotide (well for the sake of VCE bio it's probably best to consider it a nucleotide with 3 phosphates instead of one, but I think it's actually considered a nucleoside (nucleotide minus the phosphate) bound to 3 phosphates...) and NAD is a dinucleotide (the D actually stands for Dinucleotide!)
« Last Edit: September 27, 2014, 10:05:09 am by psyxwar »
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grannysmith

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Re: VCE Biology Question Thread
« Reply #3064 on: September 27, 2014, 10:08:25 am »
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Would ADP/ATP and NAD/NADH be considered nucleic acids?
I'd say they're nucleotides but not nucleic acids; nucleic acids are large polymers.

How do we distinguish trait from character?

soNasty

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Re: VCE Biology Question Thread
« Reply #3065 on: September 27, 2014, 10:59:27 am »
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How do hormones initiate the expression of genes?

Reus

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Re: VCE Biology Question Thread
« Reply #3066 on: September 27, 2014, 11:08:59 am »
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How do hormones initiate the expression of genes?
Well particular hormones bind to intracellular receptors and initiate signal transduction (series of events/reactions that are dependent on each other) for a specific secretion or something of its kind (really depends on the hormone). This then leads to changes in gene expression as the hormone is solely functioning to stimulate specific cells or tissue/action.
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Reus

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Re: VCE Biology Question Thread
« Reply #3067 on: September 27, 2014, 11:14:49 am »
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In the SD it doesn't say anything specific about translation so do we need to know that in the large subunit (of rRNA) there are three sites:

Site A-Where tRNA binds to mRNA
Site P-Where tRNA drops off the amino acid and a peptide bond forms
Site E-Where the tRNA exits the ribosome

???
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psyxwar

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Re: VCE Biology Question Thread
« Reply #3068 on: September 27, 2014, 11:35:52 am »
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In the SD it doesn't say anything specific about translation so do we need to know that in the large subunit (of rRNA) there are three sites:

Site A-Where tRNA binds to mRNA
Site P-Where tRNA drops off the amino acid and a peptide bond forms
Site E-Where the tRNA exits the ribosome

???
nope
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #3069 on: September 27, 2014, 01:28:04 pm »
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I'm confused as to whether Actin and Myosin are globular or fibrous proteins?
some sources I have read said they are globular (and I thought they were too
since they have a functional role?) but my checkpoints says they are fibrous.

any clarifications would be great!

vox nihili

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Re: VCE Biology Question Thread
« Reply #3070 on: September 27, 2014, 02:24:53 pm »
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I'm confused as to whether Actin and Myosin are globular or fibrous proteins?
some sources I have read said they are globular (and I thought they were too
since they have a functional role?) but my checkpoints says they are fibrous.

any clarifications would be great!

Actin is globular, but arranges itself into a filament. Pretty sure myosin is also globular, though not entirely sure. It's not really all that important to be honest.

No, I wouldn't consider them nucleic acids but only because nucleic acids are, by definition, large macromolecules. ADP/ATP is a nucleotide (well for the sake of VCE bio it's probably best to consider it a nucleotide with 3 phosphates instead of one, but I think it's actually considered a nucleoside (nucleotide minus the phosphate) bound to 3 phosphates...) and NAD is a dinucleotide (the D actually stands for Dinucleotide!)

That's right. ATP is just the adenine nucleotide (which is actually called AMP) plus a couple of extra phosphate groups!
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soNasty

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Re: VCE Biology Question Thread
« Reply #3071 on: September 27, 2014, 03:29:28 pm »
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what does it mean when stating that "actin is highly conserved"
Does it mean the gene coding for actin has a low mutation rate?
Also, what allows for a low mutation rate in gene sequences?

anat0my

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Re: VCE Biology Question Thread
« Reply #3072 on: September 27, 2014, 03:40:35 pm »
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what does it mean when stating that "actin is highly conserved"
Does it mean the gene coding for actin has a low mutation rate?
Also, what allows for a low mutation rate in gene sequences?

Being conserved means that it remains essentially unchanged throughout evolution.

soNasty

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Re: VCE Biology Question Thread
« Reply #3073 on: September 27, 2014, 04:34:49 pm »
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thanks!

anat0my

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Re: VCE Biology Question Thread
« Reply #3074 on: September 27, 2014, 04:54:06 pm »
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When tissue rejection occurs, do only NK cells attack the 'non-self' tissue? Can it also be Cytotoxic T cells? Thanks.

Also can vectors include needles?
« Last Edit: September 27, 2014, 05:09:31 pm by anat0my »