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March 29, 2024, 11:10:43 pm

Author Topic: VCE Biology Question Thread  (Read 3571705 times)  Share 

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instax101

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Re: VCE Biology Question Thread
« Reply #8145 on: September 19, 2016, 06:52:35 pm »
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Hey all,
I was wondering, in the attached question, why C isn't correct but A is.

I was taught that glycoproteins were involved in maintaining the structural integrity of the plasma membrane, so I just wanted some clarification.

Thanks

HasibA

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Re: VCE Biology Question Thread
« Reply #8146 on: September 19, 2016, 06:59:35 pm »
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-snip-
correct me if im wrong, but doesnt cholesterol maintain the integrity of the membrane, along side some other fibrous proteins or something? glyco proteins and glyco lipids mainly act as receptors to receive bodies of info, and signal to other cells etc.
(not too sure tho, solid question but)!
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instax101

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VCE Biology Question Thread
« Reply #8147 on: September 19, 2016, 07:00:19 pm »
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Hey again,
The diagram refers to Question 29 - I just wanted to know why it couldn't be B (The answer was C)

Thanks

HasibA

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Re: VCE Biology Question Thread
« Reply #8148 on: September 19, 2016, 07:06:44 pm »
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-snip-
think about it this way, you have a structure that was not fully 'complete' and you add in 'foreign base pairs'to make it complete. it is now a full , 'complete' circle structure (tryna explain really simply xD). this structure would be of 3678 + 837 BPs long. if you cut it at X, you simply now don't really have a full circle structure, but rather a long line (if this makes sense).  it is still the same number of BPs as both pieces added together (alas the 'complete' thing i mentioned). therefore, it would be cut into 1 fragment of 4500 bps (or whatever walue it was)
HOPE U UNDERSTAND (I SUCK AT EXPLAINING HAHA)
sorry if i confused you xD

edit: can someone give me the fundamental differences between convergent evolution, divergent evoution, analogous structures and homologous structures? google is giving me really complex info xD
essentially , convergent evolution is where a common ancestor is not shared between organisms, but similar traits have evolved independently for each organism, creating 'analogous structures'. similarly, divergent evolution stems from one common ancestor that passes on traits that allow related organisms to create bodily structures that are similar due to the common ancestor (homologous structures)

is this fine? :) thanks!
« Last Edit: September 19, 2016, 07:16:18 pm by HasibA »
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plsbegentle

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Re: VCE Biology Question Thread
« Reply #8149 on: September 19, 2016, 07:38:35 pm »
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think about it this way, you have a structure that was not fully 'complete' and you add in 'foreign base pairs'to make it complete. it is now a full , 'complete' circle structure (tryna explain really simply xD). this structure would be of 3678 + 837 BPs long. if you cut it at X, you simply now don't really have a full circle structure, but rather a long line (if this makes sense).  it is still the same number of BPs as both pieces added together (alas the 'complete' thing i mentioned). therefore, it would be cut into 1 fragment of 4500 bps (or whatever walue it was)
HOPE U UNDERSTAND (I SUCK AT EXPLAINING HAHA)
sorry if i confused you xD
hmmmm, i see what ur getting at here, but the question says that "if the recombinant plasmid was cut at point X". So the recombinant plasmid should have 3678+837bp which is 4515bp. And after the cut at point X, shouldn't it be back to 3678 bp?? Someone pls clarify for me :P
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sweetcheeks

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Re: VCE Biology Question Thread
« Reply #8150 on: September 19, 2016, 07:55:11 pm »
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hmmmm, i see what ur getting at here, but the question says that "if the recombinant plasmid was cut at point X". So the recombinant plasmid should have 3678+837bp which is 4515bp. And after the cut at point X, shouldn't it be back to 3678 bp?? Someone pls clarify for me :P
The question is asking what would happen if a single cut was made at point X. Point X is at the opposite side of the recombination, nothing is happening to the newly incorporated genetic material.

hodang

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Re: VCE Biology Question Thread
« Reply #8151 on: September 19, 2016, 08:19:09 pm »
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Hey guys! Can anyone tell me if we need to know the exact numbers of the inputs and  outputs of photosynthesis and cellular respiration? (e.g- 36 0r 38 atp molecules are producers in aerobic respiration or 12h20 molecules are produced etc.? btw is water produced (output) in the light independent stage?

hodang

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Re: VCE Biology Question Thread
« Reply #8152 on: September 19, 2016, 08:26:32 pm »
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do we also need to know homeostasis legit? i do not want to waste my time if it isnt even relevant (negative/positive feedback) ??
also guys how much ATP is produced in aerobic respiration? Some books say 32 others say 36-38, but apparently the examiners will mark 36-38 wrong? because it includes 37 which is impossible to be produced? not sure can someone please confirm

blacksanta62

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Re: VCE Biology Question Thread
« Reply #8153 on: September 19, 2016, 09:06:04 pm »
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Hey guys! Can anyone tell me if we need to know the exact numbers of the inputs and  outputs of photosynthesis and cellular respiration? (e.g- 36 0r 38 atp molecules are producers in aerobic respiration or 12h20 molecules are produced etc.? btw is water produced (output) in the light independent stage?
1) With respiration, only include number's in the chemical equation: C6H12O6 + 6O2 + 36-38 ADP + Pi -----> 6CO2 + 6H2O + 36-38 ATP
If you mean exact number of FADs and NADPs etc, then no
For photosynthesis this will suffice: 6CO2 + 6H2O ----> C6H12O6 + 6O2
Make sure you put sunlight and chlorophyll above and below the arrow to state that this process only occurs in the presence of both!
2) In the light independent stage, the only outputs are glucose, ADP + Pi and NADP. ADP + Pi and NADP are reused and re-enter the light dependent stage
do we also need to know homeostasis legit? i do not want to waste my time if it isnt even relevant (negative/positive feedback) ??
also guys how much ATP is produced in aerobic respiration? Some books say 32 others say 36-38, but apparently the examiners will mark 36-38 wrong? because it includes 37 which is impossible to be produced? not sure can someone please confirm
3) Yep. Homeostasis is very important and negative feedback helps maintain it. Defs worth learning (I'm in the process of relearning all this stuff rn!)
4) Positive feedback won't come up as much because there's few examples, someone else can confirm though :)
5) You shouldn't lose marks for stating 36-38 ATP or ADP +Pi, it makes logical sense.
Hope I helped :)
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vox nihili

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Re: VCE Biology Question Thread
« Reply #8154 on: September 19, 2016, 09:19:55 pm »
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edit: can someone give me the fundamental differences between convergent evolution, divergent evoution, analogous structures and homologous structures? google is giving me really complex info xD
essentially , convergent evolution is where a common ancestor is not shared between organisms, but similar traits have evolved independently for each organism, creating 'analogous structures'. similarly, divergent evolution stems from one common ancestor that passes on traits that allow related organisms to create bodily structures that are similar due to the common ancestor (homologous structures)

is this fine? :) thanks!

This is perfect.
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HasibA

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Re: VCE Biology Question Thread
« Reply #8155 on: September 19, 2016, 09:26:32 pm »
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This is perfect.
HAHAHA thank you- nice choice of words to especially boost my self esteem for my impending examS AHHAA xD ty ty
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blacksanta62

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Re: VCE Biology Question Thread
« Reply #8156 on: September 19, 2016, 09:36:57 pm »
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Hey guys, I just have some questions, any help would be appreciated :)
1) When explaining how negative feedback works and using blood glucose regulation as the specific example, am I allowed to say this (this is just a snippet of the answer)
"This stimulates the liver to convert glycogen into glucose and secrete it into the blood stream ==> Rise in blood glucose levels ==> Homeostasis achieved"
The part I'm worried about is in bold. The answer at the back of the book didn't comment on homeostasis being achieved
2) Could these be three major differences between nervous communication and hormonal communication
- Fast while hormonal communication requires time
- Large energy input while hormonal communication is passive (travel in the blood)
- Affects of nervous system are short lived while hormonal affects are prolonged
I didn't word them like this in my answer but this is the crux of the answer
Thank you
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geminii

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Re: VCE Biology Question Thread
« Reply #8157 on: September 19, 2016, 10:13:46 pm »
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NoBMy advice is don't memorise chemical equations and specifics, but rather know inputs and outputs of each stage of aerobic cellular respiration. TBH teachers and examiners don't care about that level of detail

True, we don't need to know specific numbers of pyruvate molecules and NADP and all that, just the inputs and outputs of each stage. :)
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thuynh

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Re: VCE Biology Question Thread
« Reply #8158 on: September 20, 2016, 12:42:27 pm »
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whats the difference between parallel and convergent evolution? the examples make it sound the same!

geminii

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Re: VCE Biology Question Thread
« Reply #8159 on: September 20, 2016, 12:55:19 pm »
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If 12 H2O is an input in the light dependent reaction in photosynthesis, should I add 6H2O as one of the outputs? If so, is 6H2O an output of the light dependent or light independent stage?
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