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March 29, 2024, 06:44:41 am

Author Topic: VCE Biology Question Thread  (Read 3570885 times)  Share 

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Rod

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Re: VCE Biology Question Thread
« Reply #885 on: February 25, 2014, 12:12:40 am »
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Does anyone have any good analogies they use when remembering things for biology?

I remember that "All good things are pure"
So, Adenine and Guanine are purines :)

- I read it off some website!
Pyramids are sharp. They CUT - Cytosine, guanine, thymine (pyrimidines)

A greedy cat ate eggs = auxin, gibberilin, cytokinis, absisic acid, ethelene (sorry for spelling errors)


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vox nihili

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Re: VCE Biology Question Thread
« Reply #886 on: February 25, 2014, 12:15:10 am »
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Care to share some thoughts or attempt these first :) ?

1)Which cell organelles are the heaviest and which are the lightest? Could someone please make a list for me!
I know that the nucleus is the heaviest, but I'm not entirely sure what order the other organelles follow.
2)How do you determine the size (in micrometers) of cells when given the magnification?
No idea.  :-[
3)What's the average size of prokaryotic and eukaryotic cells (in micrometers)?
Once again, I have no idea. I only know that prokaryotic cells are generally smaller than eukaryotic cells.
4)Why is protein and RNA more prevalent than DNA, lipids, and glycogen in prokaryotic cells?
Prokaryotic cells are simpler, therefore their structures mainly consist of proteins........not too sure about the rest!
5)Are the sequence of bases which code for amino acids universal over all organisms?
I have a feeling that they are because, after all, all DNA and RNA are made up from the same basic nucleotide structures. The question from the practice exam that I was doing specifically referred to TAG which I know is stop codon. It asked if it was present in cat's as a stop codon too.
Better to make your own thread if you're going to bomb with heaps of questions
« Last Edit: February 25, 2014, 06:44:32 pm by Mr. T-Rav »
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nhmn0301

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Re: VCE Biology Question Thread
« Reply #887 on: February 25, 2014, 04:21:45 pm »
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Hi, just have some questions regarding movement of substances through membrane.
In my experiment, I have to place beet root slices in different alcohol concentration and observe the movement. My teacher said that I can not refer the concentrated alcohol solution as a hypertonic environment since this is not about the amount of solute in the extra cellular fluid. What should I refer this type of alcohol solution to? Secondly, what I have observed through the experiment is that the more concentrated the alcohol solution, the more pink pigment from beet root diffuse out of the cell, is it because when alcohol moves into the cell through diffusion, the membrane is under stressed and hence release its pigment to balance the concentration gradient.

Finally, in the experiment, I also need to place beet root slices in different type of pH range solution as well. In a pH of 2, I realize that the pink pigment is released much significantly compared to the pH of 6 and 8, is it because the acidity of pH has denatured the protein channels, leaving a huge gaps in the membrane, hence the cell releases its cell content more readily?

Thanks heaps guys :d!
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Re: VCE Biology Question Thread
« Reply #888 on: February 25, 2014, 04:45:45 pm »
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Pyramids are sharp. They CUT - Cytosine, guanine, thymine (pyrimidines)

A greedy cat ate eggs = auxin, gibberilin, cytokinis, absisic acid, ethelene (sorry for spelling errors)

Do we need to know the second part? What is that for anyways?

nhmn0301

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Re: VCE Biology Question Thread
« Reply #889 on: February 25, 2014, 04:53:40 pm »
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Do we need to know the second part? What is that for anyways?
Auxins, cytokinis,...etc are different type of hormones in plants, they all play different role in the growth and development if the plant body. You will study those in AOS 2 as long as I can remember.
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alchemy

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Re: VCE Biology Question Thread
« Reply #890 on: February 25, 2014, 05:47:55 pm »
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How is the amylase in fungi similar/different from amylase in humans?

MM1

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Re: VCE Biology Question Thread
« Reply #891 on: February 25, 2014, 05:49:59 pm »
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Can someone please concisely explain the factors affecting enzyme activity/rate of reaction? Cheers :)

Rishi97

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Re: VCE Biology Question Thread
« Reply #892 on: February 25, 2014, 06:50:34 pm »
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Can someone please concisely explain the factors affecting enzyme activity/rate of reaction? Cheers :)

pH- Can change enzyme shape by changing the charge on amino acids.
Temperature- Kinetic energy causes molecules to move around faster. At a low temp, the molecules (enzyme/substrate) move more slowly and thus, lower rate of reaction. At a higher temp, the molecules move around faster so there are more collisions. However, if the temp increases above the optimum, enzymes will dentaure permanently.
Substrate concentration- Reaction rate increases with increasing substrate concentration. There is a limit to this increase however - once all active sites are occupied (saturated), adding more substrate will not increase the reaction rate
Enzyme Concentration-  As the enzyme concentration increases the rate of the reaction increases linearly, because there are more enzyme molecules available to catalyse the reaction. At high enzyme concentration, the substrate becomes limiting so the reaction becomes constant.
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #893 on: February 25, 2014, 07:07:18 pm »
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Why does glucose contain polar groups and not triglycerides?
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #894 on: February 25, 2014, 07:14:04 pm »
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Does endocytosis and exocytosis require energy?

alondouek

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Re: VCE Biology Question Thread
« Reply #895 on: February 25, 2014, 07:16:40 pm »
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Does endocytosis and exocytosis require energy?

Yes - they are both active processes.
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #896 on: February 25, 2014, 07:35:14 pm »
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Is the word 'osmose' a proper term?
For example " The higher the osmotic pressure of a solution, the more likely it is that water will osmose into the solution."


Rishi97

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Re: VCE Biology Question Thread
« Reply #897 on: February 25, 2014, 07:37:35 pm »
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Is the word 'osmose' a proper term?
For example " The higher the osmotic pressure of a solution, the more likely it is that water will osmose into the solution."

I found it in the dictionary so it is a proper term
Osmose= "undergo diffusion by osmosis: to cause something to diffuse by osmosis, or undergo osmosis"
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #898 on: February 25, 2014, 07:58:37 pm »
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I found it in the dictionary so it is a proper term
Osmose= "undergo diffusion by osmosis: to cause something to diffuse by osmosis, or undergo osmosis"
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Thankyou so much! :)

Rishi97

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Re: VCE Biology Question Thread
« Reply #899 on: February 25, 2014, 08:06:02 pm »
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Thankyou so much! :)

Your welcome  :D
Do you happen to have any practise osmosis questions? I have my sac on friday on osmosis
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