• Best of luck to the class of 2024 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here
  • YOU can help the next generation of students in the community!
    Share your trial papers and notes on our Notes & Resources page
MedVision ad

Biology hsc exam who ready!! (1 Viewer)

Status
Not open for further replies.
Joined
Jul 21, 2009
Messages
41
Gender
Female
HSC
2009
do you think the exam will be easier this year since last years paper was a lil harder than usual?

crap still have communication to study
 

sam5

Member
Joined
Jun 28, 2009
Messages
473
Gender
Male
HSC
2009
do you think the exam will be easier this year since last years paper was a lil harder than usual?

crap still have communication to study
what (specifically) was hard about last years bio paper?

Maybe it will be easier - but they will prolly go for 'different' things to stop the hsc getting stale.
 
Joined
Mar 26, 2009
Messages
188
Location
The Land Of Procrastinating.. Which is in the same
Gender
Female
HSC
2009
Hey guys.

I am having a lot of trouble understanding the relationship between polypeptides and proteins.. What are polypeptides anyway? I know the deal with mRNA and tRNA and how DNA controls the production of polypeptides.. But am so stuck on everything else.


FML x 1000!
 

sam5

Member
Joined
Jun 28, 2009
Messages
473
Gender
Male
HSC
2009
Hey guys.

I am having a lot of trouble understanding the relationship between polypeptides and proteins.. What are polypeptides anyway? I know the deal with mRNA and tRNA and how DNA controls the production of polypeptides.. But am so stuck on everything else.
atoms make up amino acids. Amino acids make up polypeptides. Polypeptides make up proteins.
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
Hey guys.

I am having a lot of trouble understanding the relationship between polypeptides and proteins.. What are polypeptides anyway? I know the deal with mRNA and tRNA and how DNA controls the production of polypeptides.. But am so stuck on everything else.


FML x 1000!
polypeptides are composed of amino acids linked by peptide bonds. proteins are made up of one or more polypeptide chains.
 

Brontecat

Member
Joined
Oct 21, 2008
Messages
784
Location
where i live
Gender
Female
HSC
2010
hey with the kidneys i get the whoe filtration and reabsorption part but what do i need to know about secretion??

btw thankyou sooo much to anyone who answers
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
hey with the kidneys i get the whoe filtration and reabsorption part but what do i need to know about secretion??

btw thankyou sooo much to anyone who answers
§ Secretion: This is the process where the body actively transports substances from the blood into the nephron. Some toxins, such as urea, tend to diffuse back into the blood, so it must be secreted back into the nephron. It is also done to regulate salt and water levels again, or to remove additional toxins. This is active transport.
 

Brontecat

Member
Joined
Oct 21, 2008
Messages
784
Location
where i live
Gender
Female
HSC
2010
Secretion: This is the process where the body actively transports substances from the blood into the nephron. Some toxins, such as urea, tend to diffuse back into the blood, so it must be secreted back into the nephron. It is also done to regulate salt and water levels again, or to remove additional toxins. This is active transport.
so its like the beginning and happens before filtration and reabsorption?
 
Last edited:

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
So is a protein chain the chain of Amino acids joined by the peptide bonds?
so amino acids form polypetides.

these polyptides are joined by peptide bonds (the bonds between each molecule). thus forming polypetide chains.

protein is made up of one or more of these polypeptide chains.
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
so its like the beginning and happens before filtration and reabsorption
my understanding is that it is done selectively to remove toxins that have diffused back into the blood. logically, these toxins would diffuse back into the blood through the reabsorption stage. the body then actively secretes the toxins that shouldn't have diffused back into the blood.

so from this i gather that is done at the during the final stages of the cycle. but you also have to consider that the process is continuous.
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
if you guys have any more questions post them up. i'd be really happy to answer them as it helps me and you.
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
secretion isnt in the syllabus is it?
in the syllabus it doesn't specifically mention secretion but it is part of the active transport associated with kidneys as the toxins that diffused back in the blood are actively secreted into the nephron.

hope you see what i'm tryin to say.
 

Brontecat

Member
Joined
Oct 21, 2008
Messages
784
Location
where i live
Gender
Female
HSC
2010
thankyou so much Xcelz - im suprised ur not on golden rep yet

good luck with the exam tomorrow to everyone :D
 

kevda1st

Member
Joined
Sep 10, 2008
Messages
126
Gender
Male
HSC
2009
Whats the enzyme that makes mRNA???

also do u guys think hormone replacement/renal dyalysis will come up??
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
haha thanks, any more questions post them up please. or if anybody wants we can alternate questions.
 

Xcelz

Member
Joined
Nov 6, 2008
Messages
96
Gender
Male
HSC
2009
Whats the enzyme that makes mRNA???

also do u guys think hormone replacement/renal dyalysis will come up??
well there was a 5 mark question on hormone activity last year which isn't exactly hormone replacement but similar. if a question did turn up it would be more likely on this than hormone activity.
 
Status
Not open for further replies.

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top