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March 29, 2024, 05:55:55 am

Author Topic: VCE Biology Question Thread  (Read 3570841 times)  Share 

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vox nihili

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Re: VCE Biology Question Thread
« Reply #10965 on: October 26, 2018, 11:15:48 am »
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Can anyone tell me what the symbol is for carriers on pedigree charts? Is it a dot in the middle or is it half-shaded?
Thank you!!!

You won't need to draw any pedigrees for the year 12 exam :)
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #10966 on: October 26, 2018, 11:18:01 am »
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You won't need to draw any pedigrees for the year 12 exam :)
They’re doing 1/2 this year not 3/4 :)
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vox nihili

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Re: VCE Biology Question Thread
« Reply #10967 on: October 26, 2018, 11:51:13 am »
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They’re doing 1/2 this year not 3/4 :)

As you were then :p





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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #10968 on: October 26, 2018, 06:08:37 pm »
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You won't need to draw any pedigrees for the year 12 exam :)

So when doing practise exams is it best to just skip these sections (and also mitosis/meiosis)?
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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10969 on: October 26, 2018, 06:42:05 pm »
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1. I understand that lysozymes break down the bacterial cell wall, but how does this affect the bacterial cell?

Could this be an appropriate answer?
- results in cell integrity being affected, as there is no cell wall to limit expansion of bacterial cell
- thus, disrupts cell ability to function properly
- resulting in death of bacteria

2. How does the cellulose cell wall prevent pathogen entry in plants?
« Last Edit: October 26, 2018, 07:35:52 pm by PopcornTime »

vox nihili

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Re: VCE Biology Question Thread
« Reply #10970 on: October 26, 2018, 07:09:23 pm »
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So when doing practise exams is it best to just skip these sections (and also mitosis/meiosis)?

Absolutely
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EllingtonFeint

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Re: VCE Biology Question Thread
« Reply #10971 on: October 26, 2018, 07:55:25 pm »
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So for Question 6 in the 2017 NH Exam,
Why is D the correct answer?
So ions are coming in because there is a high concentration on the outside of the cell, right...?
But what is happening with the ATP and ADP and Pi?
And is there a difference as to what pump (as in channel/pump) is being used by each thing?

“Nerve pumps are facilitated by Na+/K+ pumps on the membrane of the neuron” is this kinda like a transport protein for swapping potassium and sodium ions across the membrane??

“When apoptosis is initiated by DNA damage in a cell a cascade of reactions occurs in the cytoplasm”
Isn’t intrinsic apoptosis a result of internal damage like DNA damage? I thought it occurred INSIDE of the mitochondria, so what’s happening with the cascade of reactions in the cytoplasm??

So capillaries becoming permeable and leaked causes swelling, true?

Is synthesis of DNA relevant for the 2018 exam??

Is molecular homologous to do with DNA similarities/differences?

What are the differences between a bipedal and non bipedal pelvis, and what are some non bipedal species examples?



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PopcornTime

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Re: VCE Biology Question Thread
« Reply #10972 on: October 26, 2018, 08:20:28 pm »
+9
So for Question 6 in the 2017 NH Exam,
Why is D the correct answer?
So ions are coming in because there is a high concentration on the outside of the cell, right...?
But what is happening with the ATP and ADP and Pi?
And is there a difference as to what pump (as in channel/pump) is being used by each thing?

D is the correct answer. You can see one of them is a carrier protein and we know this because:
a) movement of the substance is against the concentration gradient
b) energy is being used (phosphorylation of ADP into ATP)

The other molecule is a channel protein, which you can tell by the general shape (it generally looks like two protein pores next to each other) and movement of substance along the concentration gradient.



“Nerve pumps are facilitated by Na+/K+ pumps on the membrane of the neuron” is this kinda like a transport protein for swapping potassium and sodium ions across the membrane??

You don't need to know that much detail with the sodium potassium pump, but sodium goes in and potassium comes out, allowing for action potential to move across neuron.

^somebody check tho cause I don't think im 100% right


“When apoptosis is initiated by DNA damage in a cell a cascade of reactions occurs in the cytoplasm”
Isn’t intrinsic apoptosis a result of internal damage like DNA damage? I thought it occurred INSIDE of the mitochondria, so what’s happening with the cascade of reactions in the cytoplasm??

- so pretty much when DNA damage occurs in mitochondria, caspase enzymes are release which cleave specific proteins in the nucleus and cytoplasm. The cascade of reactions in the cytoplasm just refers to the action of these caspase enzymes.

So capillaries becoming permeable and leaked causes swelling, true?
- that indirectly causes swelling
- the swelling is due to the increased blood flow as a result of these capillaries becoming more permeable


Is synthesis of DNA relevant for the 2018 exam??

Nup. Just know that it involves DNA polymerase.

Is molecular homologous to do with DNA similarities/differences?
Molecular homology you mean? it doesn't just have to do with DNA it can also be amino acids, but yes it involves comparing similarities + differences

What are the differences between a bipedal and non bipedal pelvis, and what are some non bipedal species examples?

Bipedal pelvis - narrower + bowl shaped
Non-bipedal pelvis - wider + rigid

Non-bipedal species - dogs I guess. can't really think of any of the more relevant ones, but not all primates are bipedal so some primate examples should be good.



Hope that helps

galaxy21

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Re: VCE Biology Question Thread
« Reply #10973 on: October 26, 2018, 08:31:26 pm »
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Hi,
So I have been just done the 2016 VCAA exam and came across this question (2) (attached). For part c, it asks for us to design an experiment. With these questions, is it best to write out a method, or just identify components like the IV and DV and basic experimental set-up as the answers seem to identify (also attached).
Thanks!
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Robot10

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Re: VCE Biology Question Thread
« Reply #10974 on: October 26, 2018, 08:37:19 pm »
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I’ve got a few questions.

1. Where is chlorophyll located? Is it embedded in the thylakoids membrane of grana
2. In regards to photosynthesis is this correct?
the oxygen element in water is converted to oxygen gas, while the oxygen from the reactant, CO2 ends up in glucose and water.
3. Also how is cell mediated immunity activated. Does this process involve T helper cells?
4. Why is Taq polymerase used in PCR? I know it can withstand heat but how does this help?
5. Also in terms of hominin evolution does the Homo genus have a broader bowl shaped pelvis or narrower pelvis than Australopithecus?
Thanks

vox nihili

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Re: VCE Biology Question Thread
« Reply #10975 on: October 26, 2018, 08:46:03 pm »
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I’ve got a few questions.

1. Where is chlorophyll located? Is it embedded in the thylakoids membrane of grana
2. In regards to photosynthesis is this correct?
the oxygen element in water is converted to oxygen gas, while the oxygen from the reactant, CO2 ends up in glucose and water.
3. Also how is cell mediated immunity activated. Does this process involve T helper cells?
4. Why is Taq polymerase used in PCR? I know it can withstand heat but how does this help?
5. Also in terms of hominin evolution does the Homo genus have a broader bowl shaped pelvis or narrower pelvis than Australopithecus?
Thanks

Would love to hear your thoughts on some of these questions first.
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DBA-144

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Re: VCE Biology Question Thread
« Reply #10976 on: October 26, 2018, 08:53:38 pm »
+1
1. I understand that lysozymes break down the bacterial cell wall, but how does this affect the bacterial cell?

Could this be an appropriate answer?
- results in cell integrity being affected, as there is no cell wall to limit expansion of bacterial cell
- thus, disrupts cell ability to function properly
- resulting in death of bacteria
try to focus your response more on how the cell wall prevents particular substances passing through it, and prevents particular signals getting to the cell. What I mean by this, is that if the cell wall is gone, we can have some antibiotics attaching to receptor proteins to cause a response of the cell. Consider that substances can also move across the plasma membrane very easily now and that the cell has little control over what moves across membranes.

Im not 100% about this, so might need to check with somebody else. /b]
2. How does the cellulose cell wall prevent pathogen entry in plants?
well, one example could be that the cell wall prevents pathogens prompting a response by attaching to receptor proteins and prompting the cell to engulf it.
PM me for Methods (raw 46) and Chemistry (raw 48) resources (notes, practice SACs, etc.)

I also offer tutoring for these subjects, units 1-4 :)

Robot10

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Re: VCE Biology Question Thread
« Reply #10977 on: October 26, 2018, 08:59:11 pm »
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Would love to hear your thoughts on some of these questions first.

I’ve got a few questions.

1. Where is chlorophyll located? Is it embedded in the thylakoids membrane of grana
2. In regards to photosynthesis is this correct?
the oxygen element in water is converted to oxygen gas, while the oxygen from the reactant, CO2 ends up in glucose and water.
3. Also how is cell mediated immunity activated. Does this process involve T helper cells. Secreting Cytokines to naive cytotoxic T cells
4. Why is Taq polymerase used in PCR? I know it can withstand heat but how does this help?
5. Also in terms of hominin evolution does the Homo genus have a broader bowl shaped pelvis or narrower pelvis than Australopithecus?
Thanks

randomnobody69420

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Re: VCE Biology Question Thread
« Reply #10978 on: October 26, 2018, 09:16:39 pm »
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Is it worth doing the sample exams? They don’t have answers for short answer

Hirul1280

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Re: VCE Biology Question Thread
« Reply #10979 on: October 26, 2018, 09:25:30 pm »
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What properties allow proteins to be embedded in the plasma membrane? Wouldn't they get expelled by the hydrophobic tails?