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March 29, 2024, 08:58:03 pm

Author Topic: VCE Biology Question Thread  (Read 3571561 times)  Share 

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alchemy

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Re: VCE Biology Question Thread
« Reply #570 on: February 12, 2014, 09:17:01 pm »
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What is an easier way or remembering the difference between endergonic and exogernic?
I really hope there is because I mix them up a lot.

I just link meanings of endergonic with anabolic and exergonic with catabolic. Apparently that can be more confusing though...  :-\

Chang Feng

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Re: VCE Biology Question Thread
« Reply #571 on: February 12, 2014, 09:58:34 pm »
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Okay. So condensation reaction is just molecules forming together to make a larger molecule realising water during the process. Polymerisation is specifically the joining of monomers together to form a polymer. And a condensation polymerisation is when specially monomers are joined together to form a polymer, but realising water too.
Then for hydrolysis reactions, is it just that. Or is there also hydrolysis polymerisation???
Thanks you so much

Stick

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Re: VCE Biology Question Thread
« Reply #572 on: February 12, 2014, 10:37:17 pm »
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Hydrolysis involves the breaking of subunits, so no, you cannot build a polymer from monomers through hydrolysis (you can release monomers from a polymer though).
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alchemy

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Re: VCE Biology Question Thread
« Reply #573 on: February 12, 2014, 10:38:07 pm »
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Okay. So condensation reaction is just molecules forming together to make a larger molecule realising water during the process. Polymerisation is specifically the joining of monomers together to form a polymer. And a condensation polymerisation is when specially monomers are joined together to form a polymer, but realising water too.
Then for hydrolysis reactions, is it just that. Or is there also hydrolysis polymerisation???
Thanks you so much

Condensation and condensation polymerisation are the same thing.
« Last Edit: February 12, 2014, 11:08:03 pm by alchemy »

Stick

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Re: VCE Biology Question Thread
« Reply #574 on: February 12, 2014, 10:42:08 pm »
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Not always, the formation of a triglyceride and the formation of a nucleotide from their respective subunits are not condensation polymerisation reactions - we aren't forming polymers from monomers.
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Tyleralp1

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Re: VCE Biology Question Thread
« Reply #575 on: February 13, 2014, 06:07:26 pm »
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Hey all,

Just wondering, I was reading a practice Biology sac and came across a question which seemed to have had me in a knot. I don't recall what it said exactly, but essentially, a freshwater frog, is placed into salt water. It said the sodium ions move in the frog, and then the they are pumped out. It asks for us to explain how they get in and out?

Therefore, could someone please give me detailed answer to that? Also, I thought that solutes don't move into cells, only the water, so why in this case are the ions moving in? Doesn't the polar nature of the protein channels repel charged particles?

Is this a trick question.

Thanks :)
The GOAL: Attain a RAW study score of 40+ in all my subjects.

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grannysmith

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Re: VCE Biology Question Thread
« Reply #576 on: February 13, 2014, 06:17:16 pm »
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Perhaps the sodium ions are actively transported into the frog's cells o.o

MM1

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Re: VCE Biology Question Thread
« Reply #577 on: February 13, 2014, 06:18:49 pm »
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Hey all,

Just wondering, I was reading a practice Biology sac and came across a question which seemed to have had me in a knot. I don't recall what it said exactly, but essentially, a freshwater frog, is placed into salt water. It said the sodium ions move in the frog, and then the they are pumped out. It asks for us to explain how they get in and out?

Therefore, could someone please give me detailed answer to that? Also, I thought that solutes don't move into cells, only the water, so why in this case are the ions moving in? Doesn't the polar nature of the protein channels repel charged particles?

Is this a trick question.

Thanks :)

So I might not be 100% correct here, but I've learnt that the protein pumps are actually part hydrophilic and part hydrophobic (so the area which is next to the phosphate heads is hydrophilic and the middle region is hydrophobic). Which therefore allows for transmission of charged particles such as ions through this pump. Hope this somewhat may help.

Some one please correct me if I'm wrong; cheers!

nerdmmb

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Re: VCE Biology Question Thread
« Reply #578 on: February 13, 2014, 06:54:56 pm »
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I had two questions:
1. Do we need to know about trace elements?
2. Is it correct to say that animal cells, which lack cell walls, undergo lysis when placed in an aqueous solution due to the osmotic pressure that accumulates within the cell to enable the two mediums (cytoplasm and aqueous solution) to reach equilibrium?

Thanks!
« Last Edit: February 13, 2014, 06:56:29 pm by nerdmmb »

howlingwisdom

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Re: VCE Biology Question Thread
« Reply #579 on: February 13, 2014, 07:35:14 pm »
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I'm not quite sure how to answer this question for H/W :/ :

When mountain climbers reach high altitudes the concentration of gas particles decreases. What affect would this have on the diffusion of carbon dioxide?

I'm assuming that the concentration of carbon dioxide expelled from the mountain climbers is high and therefore, the rate of diffusion of carbon dioxide will be rapid?
VCE: 2014-2015 (English Language, Maths Methods, Biology, Chemistry, French, Latin)

2016: BMedSt + MD at Bond University (2020)

MM1

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Re: VCE Biology Question Thread
« Reply #580 on: February 13, 2014, 07:44:05 pm »
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I'm not quite sure how to answer this question for H/W :/ :

When mountain climbers reach high altitudes the concentration of gas particles decreases. What affect would this have on the diffusion of carbon dioxide?

I'm assuming that the concentration of carbon dioxide expelled from the mountain climbers is high and therefore, the rate of diffusion of carbon dioxide will be rapid?

I think your answer is correct because since there is a large concentration gradient, diffusion will occur at a faster rate.

grannysmith

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Re: VCE Biology Question Thread
« Reply #581 on: February 13, 2014, 07:50:30 pm »
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I had two questions:
1. Do we need to know about trace elements?
2. Is it correct to say that animal cells, which lack cell walls, undergo lysis when placed in an aqueous solution due to the osmotic pressure that accumulates within the cell to enable the two mediums (cytoplasm and aqueous solution) to reach equilibrium?

Thanks!
1. I'm not too sure about this, but if I had to take a guess, I would say no.
2. Animal cells generally undergo lysis (that is, they burst) when placed in a hypotonic solution as there is a net movement of water molecules from the region of higher water concentration - outside the cell - to the region of lower water concentration - inside the cell. This causes the cell to swell and eventually, if no regulatory mechanisms are in play, causes it to burst. I think it's important to note that osmosis will occur regardless of whether the cell is about to burst or not; so long as equilibrium has not been reached, water will continue to move into the cell. So you could probably deduce that the cell will burst before equilibrium is reached.

Edit: forgot to mention, animal cells lack both a cell wall and a large vacuole

nerdmmb

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Re: VCE Biology Question Thread
« Reply #582 on: February 13, 2014, 07:54:45 pm »
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1. I'm not too sure about this, but if I had to take a guess, I would say no.
2. Animal cells generally undergo lysis (that is, they burst) when placed in a hypotonic solution as there is a net movement of water molecules from the region of higher water concentration - outside the cell - to the region of lower water concentration - inside the cell. This causes the cell to swell and eventually, if no regulatory mechanisms are in play, causes it to burst. I think it's important to note that osmosis will occur regardless of whether the cell is about to burst or not; so long as equilibrium has not been reached, water will continue to move into the cell. So you could probably deduce that the cell will burst before equilibrium is reached.

Edit: forgot to mention, animal cells lack both a cell wall and a large vacuole
Thanks! Can you please explain what kinds of regulatory mechanisms prevent lysis? I never actually knew that..

grannysmith

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Re: VCE Biology Question Thread
« Reply #583 on: February 13, 2014, 07:57:30 pm »
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Thanks! Can you please explain what regulatory mechanisms prevent lysis? I never actually knew that..

For example, most cells are packed closely together; they exert pressure on one another which prevents them from bursting.

nerdmmb

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Re: VCE Biology Question Thread
« Reply #584 on: February 13, 2014, 08:03:46 pm »
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I was also wondering, does bipolar refer to chemical substances that possess both polar and non-polar properties such as alcohol?