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July 16, 2019, 12:21:29 pm

Author Topic: VCE Biology Question Thread  (Read 1259377 times)  Share 

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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10710 on: September 30, 2018, 10:52:15 am »
+1
How much detail about the nervous system should we know for the exam? Some of the old exams have action potentials, firing off, motor, sensory neutrons, etc, but we haven't covered that at school.

Thanks.
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10711 on: September 30, 2018, 11:38:22 am »
0
What should we know about aneuploid, polyploidy and tetraploidy for the exam?

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10712 on: September 30, 2018, 12:06:35 pm »
+1
What should we know about aneuploid, polyploidy and tetraploidy for the exam?
Pretty sure you just need to know what they are. So know that aneuploidy and polyploidy are types of mutations. Know that monosomy and trisomy are types of aneuploidy. Triploidy and tetraploidy are types of polyploidy etc. you should also know how to write that (so 2n+1, 2n-1, 3n, 4n)
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juntyhee

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Re: VCE Biology Question Thread
« Reply #10713 on: September 30, 2018, 06:14:06 pm »
0
Few questions:
1. What's the difference between protein-based and peptide-based hormones?
2. What does the "recycling of cell debris" stage of apoptosis comprise of?
3. What is the final stage of apoptosis? Signal for macrophages? Cell fragments into apoptotic bodies?
4. Does light energy excite electrons in the ETC of light dependent stage, or is it only used for photolysis?
5. What are "prominent heelbones" and how do they provide a selection advantage?
6. What's the difference between clonal selection and expansion?
7. For inflammation, doesn't vasodilation DECREASE blood pressure? So why is there an increased blood flow?

Thanks so much!

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DBA-144

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Re: VCE Biology Question Thread
« Reply #10714 on: September 30, 2018, 11:27:24 pm »
0
7. For inflammation, doesn't vasodilation DECREASE blood pressure? So why is there an increased blood flow?
Vasodilation means that blood vessles dilate, mean get bigger or wider, allowing more blood to flow through, thus increasing blood pressure. I think you have vasodilation confused with vasoconstriction here. Vasodilation decreases blood pressure, by making the width of the veins go thinner.

Hope this helps.  :)

vox nihili

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Re: VCE Biology Question Thread
« Reply #10715 on: October 01, 2018, 04:33:28 pm »
+2
Vasodilation means that blood vessles dilate, mean get bigger or wider, allowing more blood to flow through, thus increasing blood pressure. I think you have vasodilation confused with vasoconstriction here. Vasodilation decreases blood pressure, by making the width of the veins go thinner.

Hope this helps.  :)

Vasodilation DECREASES blood pressure. Simple analogy is to think of a balloon. If you squeeze a balloon (constrict it) pressure rises. If you stop squeezing it, allowing it to dilate, pressure falls.
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juntyhee

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Re: VCE Biology Question Thread
« Reply #10716 on: October 01, 2018, 04:53:51 pm »
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Vasodilation DECREASES blood pressure. Simple analogy is to think of a balloon. If you squeeze a balloon (constrict it) pressure rises. If you stop squeezing it, allowing it to dilate, pressure falls.

But how does that assist in delivery of white blood cells? Don't they reach infection site slower since blood pressure is decreased ...?
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peter.g15

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Re: VCE Biology Question Thread
« Reply #10717 on: October 01, 2018, 05:32:43 pm »
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But how does that assist in delivery of white blood cells? Don't they reach infection site slower since blood pressure is decreased ...?

It helps delivery by making the capillaries more 'spaced out' to let bigger items through. So, dilation increases the size and therefore allows bigger objects (i.e. white blood cells) to pass through it and into the site of infection. The speed at which it occurs shouldn't really change and it wouldn't make a noticeable difference.
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darkz

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Re: VCE Biology Question Thread
« Reply #10718 on: October 01, 2018, 06:14:33 pm »
0
2015, Q7C
In the rat pituitary gland, GC stimulates the production of the growth hormone protein, However, in the rat liver, GC stimulates the production of the enzyme tryptophan oxygenase. Given that the genetic sequence is identical in all somatic rat cells, explain how the production of distinct proteins in different cell types could occur.

The answer is: Factors expressed by regulator genes could lead to the production of the different proteins

Could someone please explain what the factors expressed by regulator genes actually are? And would exon juggling/ alternative splicing be considered a valid answer?

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galaxy21

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Re: VCE Biology Question Thread
« Reply #10719 on: October 01, 2018, 06:40:53 pm »
0
Hi, can anybody explain what this question means?


A protein-based fibre could be constructed from repeated monomers of:

A. C5H13N4COOH
B. CH3(CH2)nCOOH
C. CX(H2O)Y
D. C6H5COOC1

The correct answer is A.
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darkz

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Re: VCE Biology Question Thread
« Reply #10720 on: October 01, 2018, 06:44:16 pm »
+4
Hi, can anybody explain what this question means?


A protein-based fibre could be constructed from repeated monomers of:

A. C5H13N4COOH
B. CH3(CH2)nCOOH
C. CX(H2O)Y
D. C6H5COOC1

The correct answer is A.

Proteins are made out of an amino group (NH2), carboxyl group (COOH), and then the R, variable group. Therefore it cannot be B, C or D as they all lack nitrogen. Therefore the answer must be A
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10721 on: October 01, 2018, 09:51:49 pm »
0
can we say RNA polymerase breaks the dna strand open?

darkz

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Re: VCE Biology Question Thread
« Reply #10722 on: October 01, 2018, 09:56:32 pm »
+1
can we say RNA polymerase breaks the dna strand open?

It would probably be better to say that transcription factors unwind the DNA, but I doubt you'd need to incorporate this into your answer. For example, if a question asks for you to describe transcription, you can simply say that the double stranded DNA is unwound, allowing for RNA polymerase to ....etc
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peter.g15

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Re: VCE Biology Question Thread
« Reply #10723 on: October 01, 2018, 10:58:30 pm »
+3
2015, Q7C
In the rat pituitary gland, GC stimulates the production of the growth hormone protein, However, in the rat liver, GC stimulates the production of the enzyme tryptophan oxygenase. Given that the genetic sequence is identical in all somatic rat cells, explain how the production of distinct proteins in different cell types could occur.

The answer is: Factors expressed by regulator genes could lead to the production of the different proteins

Could someone please explain what the factors expressed by regulator genes actually are? And would exon juggling/ alternative splicing be considered a valid answer?



I feel like the mean something similar to transcriptional factors. I emailed my teacher about this question too and she said that the old study design didn't have an emphasis on the stuff we do now. So, i think exon juggling could be considered a valid answer IMO. I think if it's reasonably justified and correct in terms of your knowledge, you should get the marks. The examiners reports don't list out all the potential solutions :)
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10724 on: October 02, 2018, 08:18:17 am »
0
Is enzyme optimal temperature an example of natural selection?

- so only organisms with correct enzyme optimal temperature survived, reproduced, passed on favourable alleles to offspring

Am I overthinking this or would this be correct?