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March 29, 2024, 08:17:22 am

Author Topic: VCE Biology Question Thread  (Read 3570957 times)  Share 

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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11370 on: November 01, 2018, 04:29:06 pm »
+2
What are the inputs and outputs of kreb cycle and ETC?

Krebs:
2 Pyruvate + 2 ADP + 2 Pi + 8 NAD + 2 FAD = 6CO2 + 2 ATP + 8 NADH + 2 FADH2
Electron transport chain:
6O2 + 10 NADH + 2 FADH2 + 32 ADP + 32 Pi = 6H2O + 10 NAD + 2 FAD + 32 ATP
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Owlbird83

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Re: VCE Biology Question Thread
« Reply #11371 on: November 01, 2018, 04:31:14 pm »
0
Krebs:
2 Pyruvate + 2 ADP + 2 Pi + 8 NAD + 2 FAD = 6CO2 + 2 ATP + 8 NADH + 2 FADH2
Electron transport chain:
6O2 + 10 NADH + 2 FADH2 + 32 ADP + 32 Pi = 6H2O + 10 NAD + 2 FAD + 32 ATP

Do we have to know the number of NADH and FADH?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11372 on: November 01, 2018, 04:32:48 pm »
+1
Do we have to know the number of NADH and FADH?
Definitely not FADH (I just copied that from my notes). Not sure on whether you have to know the number of NADH. I think it’s unlikely (given it’s in a different part of the study design to the part about cellular respiration).
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AISHAB

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Re: VCE Biology Question Thread
« Reply #11373 on: November 01, 2018, 04:37:28 pm »
0
Krebs:
2 Pyruvate + 2 ADP + 2 Pi + 8 NAD + 2 FAD = 6CO2 + 2 ATP + 8 NADH + 2 FADH2
Electron transport chain:
6O2 + 10 NADH + 2 FADH2 + 32 ADP + 32 Pi = 6H2O + 10 NAD + 2 FAD + 32 ATP

Thanks!

randy123

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Re: VCE Biology Question Thread
« Reply #11374 on: November 01, 2018, 04:45:10 pm »
0
On last year's exam its asking about "explain why the data was recorded for 4 minutes no just 1" (question 11c if anyone is wondering)
in the marking scheme it says to establish a baseline, but i am not sure whether my answer would be accepted;

I wrote:
"To see whether the results changed over time, waiting until they plateau"

they started to plateau from 2 minutes onwards

crawlingvines

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Re: VCE Biology Question Thread
« Reply #11375 on: November 01, 2018, 04:50:06 pm »
0
When given a diagram of a protein's secondary structure, how do you tell the difference between a random coil and an alpha helix? I always confuse them visually bc of the spiral shape common to both.

Erutepa

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Re: VCE Biology Question Thread
« Reply #11376 on: November 01, 2018, 04:50:36 pm »
+1
On last year's exam its asking about "explain why the data was recorded for 4 minutes no just 1" (question 11c if anyone is wondering)
in the marking scheme it says to establish a baseline, but i am not sure whether my answer would be accepted;

I wrote:
"To see whether the results changed over time, waiting until they plateau"

they started to plateau from 2 minutes onwards
I am not a fan of vcaa's answer here.
I think that the reason should be to establish an accurate baseline.
Just one minutes would give you a baseline, but by waiting 4 minutes until the recordings stabilise, you get an accurate baseline/control.
When given a diagram of a protein's secondary structure, how do you tell the difference between a random coil and an alpha helix? I always confuse them visually bc of the spiral shape common to both.
I don't think the vcaa will give you a diagram where a coil isn't a alpha helix.
I am fairly certain that for the exam, any diagram of a coil in a protein will be an alpha helix.
« Last Edit: November 01, 2018, 04:53:45 pm by Erutepa »
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11377 on: November 01, 2018, 04:53:02 pm »
+2
On last year's exam its asking about "explain why the data was recorded for 4 minutes no just 1" (question 11c if anyone is wondering)
in the marking scheme it says to establish a baseline, but i am not sure whether my answer would be accepted;

I wrote:
"To see whether the results changed over time, waiting until they plateau"

they started to plateau from 2 minutes onwards
I don’t think that’d be accepted because you’re not trying to see whether the results change. If you worded it a bit differently, something about ensuring the measurements before hand were consistent or something then I think you’d get it.

When given a diagram of a protein's secondary structure, how do you tell the difference between a random coil and an alpha helix? I always confuse them visually bc of the spiral shape common to both.
They’ll make it very clear. Google ‘secondary protein structure’ and have a look through the images the pop up. Alpha helix’s are normally drawn bigger and are long consistent coil whereas random coil are just the random bits that twist all sorts of ways.
« Last Edit: November 01, 2018, 04:55:50 pm by PhoenixxFire »
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Bri MT

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Re: VCE Biology Question Thread
« Reply #11378 on: November 01, 2018, 04:54:30 pm »
+3
Definitely not FADH (I just copied that from my notes). Not sure on whether you have to know the number of NADH. I think it’s unlikely (given it’s in a different part of the study design to the part about cellular respiration).


Just clarifying for anyone who hasn't read the previous post, it's FADH2 not FADH (as PF correctly stated earlier) :)

On last year's exam its asking about "explain why the data was recorded for 4 minutes no just 1" (question 11c if anyone is wondering)
in the marking scheme it says to establish a baseline, but i am not sure whether my answer would be accepted;

I wrote:
"To see whether the results changed over time, waiting until they plateau"

they started to plateau from 2 minutes onwards

I'd be cautious about writing that because "waiting until they changed" could be interpreted as you thinking this was the experimental condition. Instead, I'd write "to establish a baseline" or "to provide a comparison against which the experimental results can be interpreted" etc.


When given a diagram of a protein's secondary structure, how do you tell the difference between a random coil and an alpha helix? I always confuse them visually bc of the spiral shape common to both.

With an alpha helix there will be multiple consistent loops whereas random coiling doesn't have a particular set pattern

persistent_insomniac

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Re: VCE Biology Question Thread
« Reply #11379 on: November 01, 2018, 05:12:23 pm »
0
What is everyone doing as last minute revision? I don't know what to do

Hiea

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Re: VCE Biology Question Thread
« Reply #11380 on: November 01, 2018, 05:13:55 pm »
+1
What is the difference/are the differences between genetic testing and genetic screening?

I've heard that genetic testing is done for one individual, whereas genetic screening is done for multiple (and that genetic testing only looks at one gene?). Is that correct?

What is everyone doing as last minute revision? I don't know what to do

I went over the study design as a checklist, looked over my errors in practice exams, and am currently asking/answering questions. And then after that, I guess I'll have a panic attack or breakdown (or a few) later today  :)
« Last Edit: November 01, 2018, 05:18:26 pm by Hiea »
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missile

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Re: VCE Biology Question Thread
« Reply #11381 on: November 01, 2018, 05:24:23 pm »
0
Hi everyone, I've just got a couple questions
1. Are operons specific to prokaryotes?
2. Are there operator genes in eukaryotic DNA?
3. Are all genes in prokaryotes organised into operons?
4. Do eukaryotic regulatory genes produce repressor protein or transcription factors?

Thank you very much
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darkz

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Re: VCE Biology Question Thread
« Reply #11382 on: November 01, 2018, 05:26:58 pm »
+1
Hi everyone, I've just got a couple questions
1. Are operons specific to prokaryotes?
2. Are there operator genes in eukaryotic DNA?
3. Are all genes in prokaryotes organised into operons?
4. Do eukaryotic regulatory genes produce repressor protein or transcription factors?

Thank you very much
1. For VCE yes
2. For VCE no
3. Don't believe so
4. Transcription factors
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LOL_ABC

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Re: VCE Biology Question Thread
« Reply #11383 on: November 01, 2018, 05:29:54 pm »
0
GUYS HELP i legit am stuffed for tomorrows bio exam :(( i am unaware what score GENERALLY i need for a 32 study score help and like for a tbh

Bri MT

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Re: VCE Biology Question Thread
« Reply #11384 on: November 01, 2018, 05:35:59 pm »
0
GUYS HELP i legit am stuffed for tomorrows bio exam :(( i am unaware what score GENERALLY i need for a 32 study score help and like for a tbh

Based on last year's exam and comparable SAC results roughly 55%