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March 28, 2024, 11:30:01 pm

Author Topic: VCE Biology Question Thread  (Read 3570480 times)  Share 

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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #900 on: February 25, 2014, 08:11:55 pm »
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Why is nitrogen an essential inorganic element for all organisms? :(
VCE: 2014-2015 (English Language, Maths Methods, Biology, Chemistry, French, Latin)

2016: BMedSt + MD at Bond University (2020)

alondouek

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Re: VCE Biology Question Thread
« Reply #901 on: February 25, 2014, 08:21:45 pm »
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Why is nitrogen an essential inorganic element for all organisms? :(

Think back to the composition of biomacromolecules. Which classes of biomacromolecules require nitrogen as part of their structure?

Answer
Proteins (CHON(S)) and Nucleic Acids (CHONP(S))

Without nitrogen, these biomacromolecules couldn't exist.
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #902 on: February 25, 2014, 08:22:21 pm »
+1
Your welcome  :D
Do you happen to have any practise osmosis questions? I have my sac on friday on osmosis

Yeah! But they are pretty typical, but still good for revision!

- What will happen to an animal/plant cell when placed in a strong salt solution? A pure water solution?

- Describe the conditions under which plant cells lose turgor

- Why are red blood cells suspended in saline (salt) solution and not pure water.

- The amoeba a single celled organism, lives in fresh water. Identify a problem foe this organism and investigate how this organism overcomes this problem.

Goodluck! My SAC is tomorrow! :)

RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #903 on: February 25, 2014, 08:24:55 pm »
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When you say that an animal cell loses water, via osmosis and becomes shriveled up, is it right to say that the animal cell is 'crenated'?

Or can that term only be used with red blood cells?

:)

howlingwisdom

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Re: VCE Biology Question Thread
« Reply #904 on: February 25, 2014, 08:27:14 pm »
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When you say that an animal cell loses water, via osmosis and becomes shriveled up, is it right to say that the animal cell is 'crenated'?

Or can that term only be used with red blood cells?

:)


From my understanding, that term can be used with any type of animal cell when there is a considerable net water loss from the cell :)
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2016: BMedSt + MD at Bond University (2020)

nhmn0301

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Re: VCE Biology Question Thread
« Reply #905 on: February 25, 2014, 08:28:44 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!
Just repost it since I still don't know how to deal with these questions :( !
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #906 on: February 25, 2014, 08:37:29 pm »
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Would adding a cofactor or coenzyme help maximise the rate of a enzyme-controlled reaction?
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alchemy

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Re: VCE Biology Question Thread
« Reply #907 on: February 25, 2014, 08:42:16 pm »
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Would adding a cofactor or coenzyme help maximise the rate of a enzyme-controlled reaction?

Enzymes require either a cofactor or coenzyme in order to function. You shouldn't describe them as "maximising" the rate of the reaction. They are essential for an enzyme to function as a biological catalyst.

nerdmmb

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Re: VCE Biology Question Thread
« Reply #908 on: February 25, 2014, 09:04:46 pm »
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Do the factors that affect enzymes apply to all proteins?

alchemy

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Re: VCE Biology Question Thread
« Reply #909 on: February 25, 2014, 09:22:29 pm »
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Do the factors that affect enzymes apply to all proteins?

Not all. Factors such as increasing substrate concentration don't really have an effect on structural or fibrous proteins. Factors such as pH and temperature do. However, not all proteins have an optimum temperature or pH like enzymes do, and so will not be affected in this regard.

EDIT: I didn't read the your question properly the first time, so I fixed up my answer now C:
« Last Edit: February 25, 2014, 09:29:57 pm by alchemy »

vox nihili

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Re: VCE Biology Question Thread
« Reply #910 on: February 25, 2014, 10:19:40 pm »
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Do the factors that affect enzymes apply to all proteins?

Proteins that aren't enzymes seldom do anything. They normally are something rather than do something. So no. Anything relating to functionality is irrelevant when talking about other proteins.
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alchemy

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Re: VCE Biology Question Thread
« Reply #911 on: February 25, 2014, 10:27:47 pm »
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How is the amylase in fungi similar/different from amylase in humans?

Bump...This was in my SAC and I have no clue :/
+1 to anybody who gives an answer!

vox nihili

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Re: VCE Biology Question Thread
« Reply #912 on: February 25, 2014, 10:33:03 pm »
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Bump...This was in my SAC and I have no clue :/
+1 to anybody who gives an answer!

That should not be in your SAC at all....

I'm fairly certain that that has absolutely nothing to do with the course at all, very weird!
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alchemy

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Re: VCE Biology Question Thread
« Reply #913 on: February 25, 2014, 10:44:24 pm »
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That should not be in your SAC at all....

I'm fairly certain that that has absolutely nothing to do with the course at all, very weird!

That's what I thought...then I remembered that it was meant to relate to our starch/amylase experiment somehow (which I payed no attention to), but it's still a slightly vague question IMO

MM1

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Re: VCE Biology Question Thread
« Reply #914 on: February 25, 2014, 10:47:19 pm »
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That's what I thought...then I remembered that it was meant to relate to our starch/amylase experiment somehow (which I payed no attention to), but it's still a slightly vague question IMO

So would it be correct in the slightest to say that fungal amylase and human amylase break down the same substances (starch to glucose)?