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March 29, 2024, 02:32:04 am

Author Topic: VCE Biology Question Thread  (Read 3570643 times)  Share 

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Reus

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Re: VCE Biology Question Thread
« Reply #2010 on: June 23, 2014, 10:57:57 am »
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I remember this from unit 1/2. The movement of cytosol and organelles within a cell is called cytoplasmic streaming.
I learn something new everyday!  ::)
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melons

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Re: VCE Biology Question Thread
« Reply #2011 on: June 23, 2014, 02:28:04 pm »
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Sorry guys, another question.

I have noticed that there are two variations of the nervous system branches:

According to NoB2, the peripheral nervous system is divided into sensory and motor divisions. The motor division is then divided into autonomic and somatic nervous systems and the sensory division is divided into somatic and visceral sensory neurones.
According to A+ Biol Notes the peripheral nervous system is divided into somatic and autonomic. Somatic is then divided into sensory and motor and autonomic into sympathetic and parasympathetic.

Which is right and which should I be using?
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vox nihili

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Re: VCE Biology Question Thread
« Reply #2012 on: June 23, 2014, 02:52:31 pm »
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Sorry guys, another question.

I have noticed that there are two variations of the nervous system branches:

According to NoB2, the peripheral nervous system is divided into sensory and motor divisions. The motor division is then divided into autonomic and somatic nervous systems and the sensory division is divided into somatic and visceral sensory neurones.
According to A+ Biol Notes the peripheral nervous system is divided into somatic and autonomic. Somatic is then divided into sensory and motor and autonomic into sympathetic and parasympathetic.

Which is right and which should I be using?

A+
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melons

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Re: VCE Biology Question Thread
« Reply #2013 on: June 23, 2014, 02:54:21 pm »
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A+

Okay. Thanks. So using NoB2 would be considered incorrect?
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vox nihili

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Re: VCE Biology Question Thread
« Reply #2014 on: June 23, 2014, 03:02:15 pm »
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Okay. Thanks. So using NoB2 would be considered incorrect?

Probably not, though I'd say that for that A+ has probably divided the nervous system more sensibly. There are actually quite obvious anatomical differences between parasympathetic and sympathetic nerves so it'd seem unreasonable to me to not make that division.
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melons

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Re: VCE Biology Question Thread
« Reply #2015 on: June 23, 2014, 03:05:14 pm »
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Probably not, though I'd say that for that A+ has probably divided the nervous system more sensibly. There are actually quite obvious anatomical differences between parasympathetic and sympathetic nerves so it'd seem unreasonable to me to not make that division.

Okay. Later in the NoB2 book it divides autonomic into parasympathetic and sympathetic, it's just not in diagram.

Saying that we learnt the NoB 2 version at school, should I continue using that?
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Reus

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Re: VCE Biology Question Thread
« Reply #2016 on: June 23, 2014, 03:11:29 pm »
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I see that Adenine, Thymine, Uracil, Guanine and Cytosine are referred to N(Nitrogen) bases, Nitrogenous bases and also Nucleotide bases.
Which name is most suitable? Or does it not matter?

Thanks  :)
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melons

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Re: VCE Biology Question Thread
« Reply #2017 on: June 23, 2014, 03:13:08 pm »
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I see that Adenine, Thymine, Uracil, Guanine and Cytosine are referred to N(Nitrogen) bases, Nitrogenous bases and also Nucleotide bases.
Which name is most suitable? Or does it not matter?

Thanks  :)


I don't think it matters but I tend to use nitrogenous bases. :)
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vox nihili

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Re: VCE Biology Question Thread
« Reply #2018 on: June 23, 2014, 03:28:48 pm »
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Okay. Later in the NoB2 book it divides autonomic into parasympathetic and sympathetic, it's just not in diagram.

Saying that we learnt the NoB 2 version at school, should I continue using that?

I don't think it particularly matters. The divisions are kind of arbitrary. More correctly you could probably use both.

I see that Adenine, Thymine, Uracil, Guanine and Cytosine are referred to N(Nitrogen) bases, Nitrogenous bases and also Nucleotide bases.
Which name is most suitable? Or does it not matter?

Thanks  :)

They're both. Nitrogenous just reminds us taht they're nitrogen containing.
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Re: VCE Biology Question Thread
« Reply #2019 on: June 23, 2014, 03:32:23 pm »
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I don't think it particularly matters. The divisions are kind of arbitrary. More correctly you could probably use both.

Okay. Thanks heaps. :D
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Re: VCE Biology Question Thread
« Reply #2020 on: June 23, 2014, 05:46:04 pm »
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Barriers against food and water borne pathogens would include stomach pH and digestive enzymes, right? Because they're ingested the pathogens have already 'entered' the body, so the usual defences such as intact skin would surely not be applicable?
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Re: VCE Biology Question Thread
« Reply #2021 on: June 23, 2014, 05:49:12 pm »
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Barriers against food and water borne pathogens would include stomach pH and digestive enzymes, right? Because they're ingested the pathogens have already 'entered' the body, so the usual defences such as intact skin would surely not be applicable?

Correct. Stomach pH and digestive enzymes are still considered to be in the first line of defence as they are 'external' chemical barriers.
They are external as the gastrointestinal tract is open at both ends.
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #2022 on: June 23, 2014, 06:10:56 pm »
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Correct. Stomach pH and digestive enzymes are still considered to be in the first line of defence as they are 'external' chemical barriers.
They are external as the gastrointestinal tract is open at both ends.

Okay, so considering that salmonella bacteria is food-borne, what 1st line defences will fight against it? Digestive enzymes and pH? Intact skin, due to the nature of salmonella's transmission, will not be a defence, right?  Sorry, just clarifying  ::)
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melons

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Re: VCE Biology Question Thread
« Reply #2023 on: June 23, 2014, 06:16:54 pm »
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Okay, so considering that salmonella bacteria is food-borne, what 1st line defences will fight against it? Digestive enzymes and pH? Intact skin, due to the nature of salmonella's transmission, will not be a defence, right?  Sorry, just clarifying  ::)

Yes. :) Lysozymes in saliva will also be in the first line of defence.
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Re: VCE Biology Question Thread
« Reply #2024 on: June 23, 2014, 06:43:45 pm »
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If you don't have to cross an epithelium (skin) to get to it, it's first line.
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