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March 29, 2024, 06:11:46 pm

Author Topic: VCE Biology Question Thread  (Read 3571399 times)  Share 

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alondouek

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Re: VCE Biology Question Thread
« Reply #1860 on: June 09, 2014, 12:07:13 am »
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I (my school) never learnt this :/ Is this even on the study design?
Not to my knowledge.

I distinctly remember my teacher putting this exact diagram in our class notes 2 years ago, and I think I recall SAC/exam questions on it (may have been practice exams though).

I'm not sure if it's something they phased out, but it's a good thing to bring to your teacher if you want a good explanation (I'd do it but I'm drowning in exam prep).
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Scooby

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Re: VCE Biology Question Thread
« Reply #1861 on: June 09, 2014, 12:19:04 am »
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In all likelihood you'll get some exam questions about blood types, so you may as well know it
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Re: VCE Biology Question Thread
« Reply #1862 on: June 09, 2014, 01:14:02 pm »
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How do neurotransmitters carry out their function?

Since they're protein based, do they attach to membrane receptors and initiate signal transduction?


militarisation

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Re: VCE Biology Question Thread
« Reply #1863 on: June 09, 2014, 01:14:48 pm »
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Can someone pls explain mRNA, tRNA and rRNA?

nerdmmb

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Re: VCE Biology Question Thread
« Reply #1864 on: June 09, 2014, 01:37:06 pm »
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Can someone pls explain mRNA, tRNA and rRNA?

Transcription in the nucleus produces messenger RNA (mRNA) which carries genetic information or in other words nucleotide bases from the DNA strand to ribosomes. It is basically a chemical blueprint in protein synthesis.

Ribosomal RNA (rRNA) is produced in the nucleolus and is important for structural support of the ribosome as it comprises much of the ribosome.

Transfer RNA (tRNA) is a also a single stranded RNA that carries an amino acid to ribosomes. It contains 3 bases known as anti-codon and carries the amino acid to the ribosome only if these anti-codon correspond with the codon or 3 bases of the mRNA. 
« Last Edit: June 09, 2014, 01:39:41 pm by nerdmmb »

howlingwisdom

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Re: VCE Biology Question Thread
« Reply #1865 on: June 09, 2014, 03:05:32 pm »
+1
How do neurotransmitters carry out their function?

Since they're protein based, do they attach to membrane receptors and initiate signal transduction?


Yep! Since the neurotransmitters are protein-based (water-soluble) they bind to specific membrane-bound receptors on the surface of the postsynaptic membrane. Neutrotransmitters are signalling molecules, so once they bind to the receptors, they trigger a cascade of events inside the cell (signal transduction like you said) which results in an amplified cellular response. The responses are varied; but generally neurotransmitters would trigger another action potential in the following neuron.
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #1866 on: June 09, 2014, 05:26:08 pm »
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I (my school) never learnt this :/ Is this even on the study design?

I did a checkpoints question on blood types the other day...it was from the 2009 bio exam. So, I guess it is?  :-\ I didn't learn it either...


Is it correct to say that antibodies:
-can activate the complement protein system, thus either destroying pathogens (by lysis), initiating inflammation, and/or 'attracting' phagocytes
-hinder/neutralises pathogens
-make pathogens more susceptible to engulfment by phagocytes (opsonisation)
-mast cell degranulation

Is there anything else?

Also, where are natural killer cells located and when would they become active?
Is the thymus a lymph node?
« Last Edit: June 09, 2014, 05:54:15 pm by katiesaliba »
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Reus

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Re: VCE Biology Question Thread
« Reply #1867 on: June 09, 2014, 05:57:16 pm »
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I did a checkpoints question on blood types the other day...it was from the 2009 bio exam. So, I guess it is?  :-\ I didn't learn it either...

Do you recall the page and question number?
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #1868 on: June 09, 2014, 06:01:35 pm »
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Do you recall the page and question number?

Page 58, question 132
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Reus

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Re: VCE Biology Question Thread
« Reply #1869 on: June 09, 2014, 07:20:33 pm »
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Page 58, question 132
I'll check it out tomorrow! As my bio checkpoints is in my locker ><
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Scooby

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Re: VCE Biology Question Thread
« Reply #1870 on: June 09, 2014, 07:36:41 pm »
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Yep! Since the neurotransmitters are protein-based (water-soluble) they bind to specific membrane-bound receptors on the surface of the postsynaptic membrane. Neutrotransmitters are signalling molecules, so once they bind to the receptors, they trigger a cascade of events inside the cell (signal transduction like you said) which results in an amplified cellular response. The responses are varied; but generally neurotransmitters would trigger another action potential in the following neuron.

Or they might inhibit that from occurring. Also, they're not all proteins, but it's very unlikely you'll get a question testing your knowledge of the various possible chemical compositions
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #1871 on: June 09, 2014, 08:58:29 pm »
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Would the normal microflora in humans, considered to be part of the first line of defence?


katiesaliba

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Re: VCE Biology Question Thread
« Reply #1872 on: June 09, 2014, 10:32:23 pm »
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Would the normal microflora in humans, considered to be part of the first line of defence?

Yep :)
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #1873 on: June 10, 2014, 11:25:15 am »
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What is a 'superficial infection'?

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #1874 on: June 10, 2014, 02:51:17 pm »
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Hi,

Is the term autotroph strictly limited to organisms which are able to synthesis organic substances, from inorganic substances in their surroundings?

So if an organism was chemosynthetic, but used organic matter to synthesis organic nutritional requirements, it would not be an autotroph?
Since it used organic substances and not inorganic substances?