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August 21, 2019, 01:53:29 am

Author Topic: VCE Biology Question Thread  (Read 1306502 times)  Share 

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pugs

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Re: VCE Biology Question Thread
« Reply #11820 on: July 06, 2019, 11:54:57 pm »
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for the question 'under certain conditions plasmids can cross a cell membrane and enter a bacterial cell. what are they?', i have an answer of after undergoing electroporation lol because after googling & looking through the textbook i still have no idea - would anyone be able to help me out please?  :)
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xxxjss

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Re: VCE Biology Question Thread
« Reply #11821 on: July 07, 2019, 10:45:42 pm »
+5
for the question 'under certain conditions plasmids can cross a cell membrane and enter a bacterial cell. what are they?', i have an answer of after undergoing electroporation lol because after googling & looking through the textbook i still have no idea - would anyone be able to help me out please?  :)

Ultimately, you want a more fluid plasma membrane. And what can turn things to mush? Heat and electricity!!!!! This is achieved by what you have mentioned, electroporation!!!, where an electric current is administered to the bacterial cell. It is this electric current that alters the plasma membrane, increasing its permeability so the plasmid can scoot through. Likewise, another method known as heat shock can be used as well. This uses knowledge of how temperature can affect the fluidity of the membrane. The bacteria and plasmids are placed into an icey solution, which is then rapidly increased to a hotter temperature, once again allowing the plasmid to penetrate the PM! I think emphasising rapid change is important here as if it were to be gradual then them cholesterol molecules will do their thing and prevent the PM from becoming permeable enough for the plasmids to enter.
So i believe the answer is what you have already mentioned, electroporation i.e the administration of an electrical current, as well as extreme , rapid temperature changes
Hope this helps  ;D ;D ;D

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Re: VCE Biology Question Thread
« Reply #11822 on: July 09, 2019, 01:28:52 pm »
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Hey guys! Is there any difference in the terms cell replication and mitosis? Can I use them interchangeably?
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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #11823 on: July 09, 2019, 01:47:43 pm »
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Hey guys! Is there any difference in the terms cell replication and mitosis? Can I use them interchangeably?
Cell replication is more broad - it could also include DNA replication and cytokinesis. A lot of the time you will just be able to use them interchangeably though - depends on the question.
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laura_

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Re: VCE Biology Question Thread
« Reply #11824 on: July 09, 2019, 02:08:12 pm »
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Cell replication is more broad - it could also include DNA replication and cytokinesis. A lot of the time you will just be able to use them interchangeably though - depends on the question.

Thank you!!
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pugs

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Re: VCE Biology Question Thread
« Reply #11825 on: July 09, 2019, 09:02:31 pm »
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Ultimately, you want a more fluid plasma membrane. And what can turn things to mush? Heat and electricity!!!!! This is achieved by what you have mentioned, electroporation!!!, where an electric current is administered to the bacterial cell. It is this electric current that alters the plasma membrane, increasing its permeability so the plasmid can scoot through. Likewise, another method known as heat shock can be used as well. This uses knowledge of how temperature can affect the fluidity of the membrane. The bacteria and plasmids are placed into an icey solution, which is then rapidly increased to a hotter temperature, once again allowing the plasmid to penetrate the PM! I think emphasising rapid change is important here as if it were to be gradual then them cholesterol molecules will do their thing and prevent the PM from becoming permeable enough for the plasmids to enter.
So i believe the answer is what you have already mentioned, electroporation i.e the administration of an electrical current, as well as extreme , rapid temperature changes
Hope this helps  ;D ;D ;D
thanks so much!  :D
2018: lote SL
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2019 vce journal here

pugs

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Re: VCE Biology Question Thread
« Reply #11826 on: July 10, 2019, 12:00:53 am »
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apologies for yet another question ;/ i've tried searching for this but have failed to find something that sounds reasonable

how do proteins remain stable in low pH environments? (particularly relating to the R side group)

so far i have written 'R side groups on amino acids determine the nature/characteristics of the amino acid. In low pH environments, the R side groups contain features that prevent the protein from denaturing  :-X

any help would be greatly appreciated, thank you! and once again, really sorry to be bothering the bio q thread so much
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darkz

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Re: VCE Biology Question Thread
« Reply #11827 on: July 10, 2019, 09:36:02 am »
+3
apologies for yet another question ;/ i've tried searching for this but have failed to find something that sounds reasonable

how do proteins remain stable in low pH environments? (particularly relating to the R side group)

so far i have written 'R side groups on amino acids determine the nature/characteristics of the amino acid. In low pH environments, the R side groups contain features that prevent the protein from denaturing  :-X

any help would be greatly appreciated, thank you! and once again, really sorry to be bothering the bio q thread so much

Well, from my understanding, each enzyme has its own optimum pH - so therefore as you deviate away from this mark, the 3D structure will change. This is because as pH (essentially the measure of H+ ions) gets lower, there are more H+ ions present, which can affect the ionic and hydrogen bonds present.

But, what you've written is good - you'd only really need to specify what the 'features' are, though I can't think of any either ahaha.
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pugs

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Re: VCE Biology Question Thread
« Reply #11828 on: July 10, 2019, 12:29:51 pm »
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Well, from my understanding, each enzyme has its own optimum pH - so therefore as you deviate away from this mark, the 3D structure will change. This is because as pH (essentially the measure of H+ ions) gets lower, there are more H+ ions present, which can affect the ionic and hydrogen bonds present.

But, what you've written is good - you'd only really need to specify what the 'features' are, though I can't think of any either ahaha.
thank you for the help! omg i totally forgot about the optimum pH part *facepalm*
and yeah i don't know amino acids in depth enough to specify haha :^(
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Chocolatemilkshake

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Re: VCE Biology Question Thread
« Reply #11829 on: July 14, 2019, 04:19:03 pm »
+1
Hi all,
At school and also on Edrolo, we were taught about how recombinant plasmids can be created by inserting the desired gene between an antibiotic resistant gene. Then, antibiotic resistance is used to test whether the bacteria has taken up the plasmid and whether the plasmid has taken up the desired gene (is recombinant). I was wondering if this was necessary to know in detail for the course/exam?
Thanks  ;D,
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darkz

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Re: VCE Biology Question Thread
« Reply #11830 on: July 14, 2019, 04:21:33 pm »
+4
Hi all,
At school and also on Edrolo, we were taught about how recombinant plasmids can be created by inserting the desired gene between an antibiotic resistant gene. Then, antibiotic resistance is used to test whether the bacteria has taken up the plasmid and whether the plasmid has taken up the desired gene (is recombinant). I was wondering if this was necessary to know in detail for the course/exam?
Thanks  ;D,
Chocolate Milkshake

Yes, that is something you definitely need to know and has been tested previously. (Refer to Q9 VCAA 2017 Exam)
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Chocolatemilkshake

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Re: VCE Biology Question Thread
« Reply #11831 on: July 14, 2019, 04:26:30 pm »
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Yes, that is something you definitely need to know and has been tested previously. (Refer to Q9 VCAA 2017 Exam)

Thanks so much!  :)
2019 - Biology

ErnieTheBirdi

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Re: VCE biology question thread
« Reply #11832 on: July 16, 2019, 08:53:03 pm »
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I'm in some major trouble here friends![/b][/size] I was wondering if anyone has any good ways to remember all that has been taught and all that I've learnt in Biology. I just joined the second semester of VCE Biology Unit 1 and 2 and I was just wondering if anyone had any good tips to help me memorize the content and do well in Biology in the next two years. Also, I was just wondering if help me out with question answering, as I know that in Biology certain terms and phrases must be included, how would I know what to include to get the full marks or if I have written enough for the full marks even after looking at how much a mark is worth?

Thank you all for taking the time to look at this and maybe you could help me out?

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Re: VCE Biology Question Thread
« Reply #11833 on: July 16, 2019, 08:59:19 pm »
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Hey everyone,
I'm currently a year 10 student doing year 11 biology and I only just joined the class this semester due to a surplus of students in the first semester. I was wondering if there are any tips to do well in Biology and how I could memorize all the concepts and topics that I learn and make notes on. I was also wondering if anyone had any tips or ways I could answer questions to get the full marks because I know biology questions look for certain key terms or phrases, how would I know whether I used the correct ones or just if I have done the question correctly? please help?

Thank you, everyone, for taking the time to look at this comment

laura_

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Re: VCE Biology Question Thread
« Reply #11834 on: July 16, 2019, 09:08:02 pm »
+2
Hey everyone,
I'm currently a year 10 student doing year 11 biology and I only just joined the class this semester due to a surplus of students in the first semester. I was wondering if there are any tips to do well in Biology and how I could memorize all the concepts and topics that I learn and make notes on. I was also wondering if anyone had any tips or ways I could answer questions to get the full marks because I know biology questions look for certain key terms or phrases, how would I know whether I used the correct ones or just if I have done the question correctly? please help?

Thank you, everyone, for taking the time to look at this comment

Hey!
Best of luck undertaking such a wonderful subject.

Here are some links and other sources of advice that have really helped me:

This thread full of other people's articles and posts about doing well in bio. Definitely worth a browse!

This thread with some of the best resources that can be useful doing bio.

The powerpoint from the most recent ATARNotes 1/2 bio lecture will give you a good overview of things that you will cover this term.

Douchy's free podcast! (Found here.)

In terms of tips:
I think the biggest thing is to try and deeply understand all information on the study design and how it links together (without learning ridiculous amounts of excess detail in the textbook). Linking concepts and understanding how everything works together allows you to memorise info and answer questions effectively.
give like the sun and the whole world grows tall - atticus

https://www.surveylegend.com/s/1nik