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September 17, 2019, 06:45:22 pm

Author Topic: VCE Biology Question Thread  (Read 1332764 times)  Share 

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Scribe

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Re: VCE Biology Question Thread
« Reply #11055 on: October 28, 2018, 02:09:29 pm »
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1. Yep, just presume that pyruvate starts off Krebs. Don't worry about acetyl-CoA
2. You should try to answer this first.
3. Not relevant to VCE.
4. Also not relevant to VCE, but you're quite right to ask this question. Basically it's got to do with where the cells go. Dendritic cells activate helper T-cells because they go to the lymph nodes to activate them. Macrophages do indeed present antigens to T-helper cells, but where this fits into the context of an immune reaction is beyond VCE. An important VCE point though: NO cell presents antigen to B-cells. B-cells cannot see antigen in the context of MHC molecules; they only bind to free antigen.

Copy the question here please

The signal is externalised, but I don't know what you mean by "considered external".

Sorry. I saw a post that described signal reception as something along the lines of: "The binding of an external signalling molecule to a specific receptor" but I was not sure if reception in autocrine signalling involves an 'external' signalling molecule as the ligand is produced by the same cell, or whether 'external' refers to a ligand outside the cell. If that makes any sense :P

Robot10

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Re: VCE Biology Question Thread
« Reply #11056 on: October 28, 2018, 02:10:06 pm »
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B is simply a copy of the DNA sequence in RNA bases and not the complementary copy of the DNA seqence in RNA bases (minus the mutation), which is what the question is asking for (mRNA).
[/quote

Do you have to first work out the complementary DNA strand and then transcribe the complementary DNA strand into mRNA with a mutation

galaxy21

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Re: VCE Biology Question Thread
« Reply #11057 on: October 28, 2018, 02:28:44 pm »
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Hi, so a few more questions, sorry!
 1. In relation to recombinant plasmids, as the genetic markers like antibiotic resistance or ampicillin resistance already in the plasmid or are they inserted by us?
2. How much detail do we need to know about glucose? Like, do we need to know about how to glucose enters the cells and about its structure and stuff?
3. Does the lac operon require ATP at all?
4. Do prokaryotes undergo aerobic respiration too? If so, where does this occur?
5. When talking about the location of the light dependent reaction, is it best to say on the grana/granum, or on thylakoid membrane or thylakoid disks or in the thylakoids?
6. Which ions should we talk about if we are asked which are involved in the transmission of an action potential? The 2016 Insights exam asked (MC 15)
Which of the following ions are repsonsible for the transmission of an action potential allong an axon:
A. Calcium and sodium
B. Sodium and potassium
C. Potassium and Calcium
D. Sodium, potassium aand calcium

The correct answer was B, but when I looked it up on the internet, some sites said that calcium was involved as well.

Thank you!  ;D
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C14M8S

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Re: VCE Biology Question Thread
« Reply #11058 on: October 28, 2018, 02:40:32 pm »
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1) When describing Interferon, is it ample to say that it just 'slows the spread of viral particles through the use of antiviral enzymes and recruitment of natural killer cells'?
2) Is the splitting of water in the light-dependent reaction an example of hydrolysis or photolysis?
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fruitbowl34

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Re: VCE Biology Question Thread
« Reply #11059 on: October 28, 2018, 03:42:34 pm »
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Can anyone explain how to interpret the phylogenic tree in the 2017 exam MCQ32? Thanks!

Azim.m

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Re: VCE Biology Question Thread
« Reply #11060 on: October 28, 2018, 03:47:54 pm »
+3

1) When describing Interferon, is it ample to say that it just 'slows the spread of viral particles through the use of antiviral enzymes and recruitment of natural killer cells'?
2) Is the splitting of water in the light-dependent reaction an example of hydrolysis or photolysis?

2. The splitting of water is photolysis. Hydrolysis is the separation of a molecule by water and photolysis is by the action of light.

Azim.m

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Re: VCE Biology Question Thread
« Reply #11061 on: October 28, 2018, 03:57:23 pm »
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The endosymbiosis theory suggests that several organelles (notably - mitochondria and chloroplasts) were originally independent ancestral prokaryotes.

Is this definition sufficient enough?

starby

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Re: VCE Biology Question Thread
« Reply #11062 on: October 28, 2018, 04:00:34 pm »
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How much detail do you need to put into the signal transduction of neurotransmitters? Do you need to talk about calcium ions?

Also do you need to know the functions of plant hormones?

Thanks in advance for any help.

C14M8S

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Re: VCE Biology Question Thread
« Reply #11063 on: October 28, 2018, 04:04:06 pm »
+2
The endosymbiosis theory suggests that several organelles (notably - mitochondria and chloroplasts) were originally independent ancestral prokaryotes.

Is this definition sufficient enough?
That's on the right track; but make sure that you mention that they were engulfed by eukaryotes at some point.

How much detail do you need to put into the signal transduction of neurotransmitters? Do you need to talk about calcium ions?

Also do you need to know the functions of plant hormones?

Thanks in advance for any help.
You don't need to know much about neurons at all anymore - just using neurotransmitters as a method of inducing signal transduction. As for plant hormones, they're useful to know but I don't think there's too much emphasis on it now compared to previous study designs.
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Globe

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Re: VCE Biology Question Thread
« Reply #11064 on: October 28, 2018, 04:18:40 pm »
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Hey guys does anyone know of a place I can find the solutions to the 2017 VCAA Sample Exam? I know the answers to the multiple choice are at the bottom, but if anyone know's where I could find suggested solutions to the short answers that would be greatly appreciated!! Thanks :)
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Poet

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Re: VCE Biology Question Thread
« Reply #11065 on: October 28, 2018, 04:39:29 pm »
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Hey guys does anyone know of a place I can find the solutions to the 2017 VCAA Sample Exam? I know the answers to the multiple choice are at the bottom, but if anyone know's where I could find suggested solutions to the short answers that would be greatly appreciated!! Thanks :)
here you go - the short answer begins on page 3.
courtesy of VCAA. This can be found on their Biology Exams and Examination Reports page.
« Last Edit: October 28, 2018, 04:41:02 pm by secretly_a_poet »
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sophiie

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Re: VCE Biology Question Thread
« Reply #11066 on: October 28, 2018, 05:20:24 pm »
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Hey,
For a question that asked what the difference between accuracy and precision is, would this be a suitable response:
Accuracy is how close your measurement is to the correct value, whereas precision is how close together your set of measurements are.

Thanks :)

C14M8S

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Re: VCE Biology Question Thread
« Reply #11067 on: October 28, 2018, 05:21:23 pm »
+4
Hey guys does anyone know of a place I can find the solutions to the 2017 VCAA Sample Exam? I know the answers to the multiple choice are at the bottom, but if anyone know's where I could find suggested solutions to the short answers that would be greatly appreciated!! Thanks :)
There's a set of sample answers compiled by vox nihili here

Hey,
For a question that asked what the difference between accuracy and precision is, would this be a suitable response:
Accuracy is how close your measurement is to the correct value, whereas precision is how close together your set of measurements are.

Thanks :)
That's entirely correct.
« Last Edit: October 28, 2018, 05:24:40 pm by C14M8S »
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #11068 on: October 28, 2018, 07:46:10 pm »
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Which of the following is not an example of post transcriptional modification?
A. Alternate splicing
B. Exon rearrangement
C. addition of a methy guanine cap
D. alternate protein folding

The answer is D because it is a post translational modification.
Surely D is still a post transcription modification though?
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C14M8S

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Re: VCE Biology Question Thread
« Reply #11069 on: October 28, 2018, 07:58:02 pm »
+2
Which of the following is not an example of post transcriptional modification?
A. Alternate splicing
B. Exon rearrangement
C. addition of a methy guanine cap
D. alternate protein folding

The answer is D because it is a post translational modification.
Surely D is still a post transcription modification though?
D is classed as a post-translational modification. It's a case of picking the least incorrect answer - it makes the most sense of the bunch.
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