VCE Biology Question Thread

[kasthury610]

Hi there,
I just wanna know some tips on how to do well on biology. Thank you

[J_Rho]

Hi there,
I just wanna know some tips on how to do well on biology. Thank you

Hi Kasthury,
While Biology is a very content-heavy subject you have to be able to apply it. I would recommend doing practice exam questions throughout the year to work on applying the content you are learning
Here you can find an abundance of amazing resources from top scoring students

[miyukiaura]

Why are competitive inhibitors generally reversible and noncompetitive inhibitors generally irreversible?
Thanks

[eemmaa]

Why are competitive inhibitors generally reversible and noncompetitive inhibitors generally irreversible?
Thanks

Hi! Competitive inhibitors bind to the active site, but they are reversible because if the substrate concentration is increased, the inhibitor will be overcome. Non-competitive inhibitors don't bind to the active site, which means that substrate cannot compete with it, and even if the substrate binds to the active site the reaction cannot happen.

Disclaimer: I just learnt this today so it may not be 100% correct, but this is my understanding of it 

[ABB0005]

Did anyone do the pineapple in jello experiment for the enzymes sac?

[WhatisaMeMe]

Hi
Can any one please confirm whether I am correct in terms of RNA transcription. The RNA polymerase reads the DNA template from 3' to 5' end, but the pre-mRNA is synthesiesed from 5' to 3' end.
Just a little confused, thanks!

[WhatisaMeMe]

Why are competitive inhibitors generally reversible and noncompetitive inhibitors generally irreversible?
Thanks

Just to add on when a non-competitive binds to an allosteric site (site not the active site), a conformational change happens so that the substrate cannot bind to it.

[Erutepa]

Hi
Can any one please confirm whether I am correct in terms of RNA transcription. The RNA polymerase reads the DNA template from 3' to 5' end, but the pre-mRNA is synthesiesed from 5' to 3' end.
Just a little confused, thanks!

You are exactly right! This is becuase complimentary DNA/RNA strands are said to be antiparellel as they run in opposite directions. If the DNA is read by the polymerase in one diection (3' to 5') the pre-mRNA strand will consequnetially be synthesised in the opposite direction (5' to 3').
Just as a little side note though, its probably best not to call it RNA trascription - DNA is whats being transcribed, so its best to refer to it as DNA transcription, or even just transcription which is what the study design uses.

[WhatisaMeMe]

You are exactly right! This is becuase complimentary DNA/RNA strands are said to be antiparellel as they run in opposite directions. If the DNA is read by the polymerase in one diection (3' to 5') the pre-mRNA strand will consequnetially be synthesised in the opposite direction (5' to 3').
Just as a little side note though, its probably best not to call it RNA trascription - DNA is whats being transcribed, so its best to refer to it as DNA transcription, or even just transcription which is what the study design uses.

Thanks so much! 

[miyukiaura]

Can a hypothesis be partially supported? Or if one part of the hypothesis is supported while another part is not supported, does that automatically render the entire hypothesis not supported by the results?
Hope this makes sense.

[yesh.weerakkody]

Can a hypothesis be partially supported? Or if one part of the hypothesis is supported while another part is not supported, does that automatically render the entire hypothesis not supported by the results?
Hope this makes sense.

Hypothesis can definitely be partly supported.

[Mudasser.abb]

If I got 60 in my first 3/4 sac have I lost my chances of getting a 40+

[Ionic Doc]

Hey everyone, I just wanna quickly clarify something;

All anabolic reactions are endergonic
All catabolic reactions are exergonic.

Is this correct? (thnx  )

[J_Rho]

Hey everyone, I just wanna quickly clarify something;

All anabolic reactions are endergonic
All catabolic reactions are exergonic.

Is this correct? (thnx  )

Yep sure is!
think catabolic as a cat scratching a big thing into smaller things and exergonic (is like exothermic) is a big thing exploding into little things

If I got 60 in my first 3/4 sac have I lost my chances of getting a 40+

Hey!
I feel this question would be more suited to this thread. More than likely you'll get a much better response then on this thread
I definitely feel you could still get a 40+ (but I'd assume it'd be difficult - im no expert tho) despite being disappointed with this mark at the end of they day it is your ranking that matters most

[Ionic Doc]

thanks so much for that analogy J_Rho, made it way easier to remember.

Cheers