Login

Welcome, Guest. Please login or register.

March 29, 2024, 11:16:24 pm

Author Topic: VCE Biology Question Thread  (Read 3571709 times)  Share 

0 Members and 6 Guests are viewing this topic.

Sine

  • Werewolf
  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5135
  • Respect: +2103
Re: VCE Biology Question Thread
« Reply #9300 on: September 16, 2017, 12:15:01 am »
+1
Hey everyone, for units 1/2 for biology my class comprehensively studied for mitosis/meiosis. I find it weird that for unit 3/4 we did not learn about it. On the study design it says nothing about meiosis/mitosis. My question is do you think i should refresh my brain and study for mitosis/meiosis for the exam.

I feel like this is one of VCAAs tricks to separate a 50 student to a 49 student.
 
There isn't much difference between a 50/49 but who your assesor was because that is basically a 1/2-1 exam mark difference and then the difference between a mid 40's and 50 would just be about exam performance. If it's not onthe study design it can't be assesed (even if it's in 1/2) however vcaa can bypass this by "teaching" you a concept in the exam the asking a question about the material that they have provided.

mary1911997

  • Adventurer
  • *
  • Posts: 16
  • Respect: 0
  • School: Penola Catholic college
  • School Grad Year: 2016
Re: VCE Biology Question Thread
« Reply #9301 on: September 16, 2017, 12:54:44 am »
0
hi there
can some one explain and give an example of what is a genetic model (hypothesis) in a dihybrid cross( involving two genes)  and how does it differ to null hypothesis
PLEASE provide example as i am so confused
thanks

psychologie

  • Trailblazer
  • *
  • Posts: 34
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9302 on: September 24, 2017, 08:51:44 am »
0
hi!
you know for the krebs cycle, there's a step before it known as the intermediate step. Do we include that as part of the krebs cycle for the exam or pretend it doesnt exist? like should i write pyruvate as an input for krebs or acetyl-coA? and should i write 4CO2 produced or 6?

Thank you! :)

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #9303 on: September 24, 2017, 09:15:34 am »
+3

hi!
you know for the krebs cycle, there's a step before it known as the intermediate step. Do we include that as part of the krebs cycle for the exam or pretend it doesnt exist? like should i write pyruvate as an input for krebs or acetyl-coA? and should i write 4CO2 produced or 6?

Thank you! :)

Excellent question, and one of the odd things about the course. I think you’d probably get away with either pyruvate or acetyl-CoA to be perfectly honest. Likewise with the CO2
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9304 on: September 24, 2017, 07:02:13 pm »
0
Hey everyone
Does anyone know a good definition for DNA profiling and DNA fingerprinting?

LifeisaConstantStruggle

  • Forum Obsessive
  • ***
  • Posts: 324
  • Respect: +104
Re: VCE Biology Question Thread
« Reply #9305 on: September 24, 2017, 10:35:14 pm »
0
Hey everyone
Does anyone know a good definition for DNA profiling and DNA fingerprinting?
First of all DNA profiling and DNA fingerprinting refers to the same process, and a simple (but okay) definition would just be "process of determining an individual's DNA characteristics, with a reference DNA sample obtained from the individual".
2018-2020: Bachelor of Actuarial Science (+ Econometrics), Monash
2021: Bachelor of Commerce (Honours), Econometrics & Financial Mathematics, Monash
2022-2023: Work and some soul-searching

simrat99

  • Trailblazer
  • *
  • Posts: 48
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9306 on: September 25, 2017, 06:32:45 pm »
0
Hello, I was wondering does cholesterol decrease the fluidity of the plasma membrane in high temperatures? Thanks in advance!

LifeisaConstantStruggle

  • Forum Obsessive
  • ***
  • Posts: 324
  • Respect: +104
Re: VCE Biology Question Thread
« Reply #9307 on: September 25, 2017, 06:47:30 pm »
0
Hello, I was wondering does cholesterol decrease the fluidity of the plasma membrane in high temperatures? Thanks in advance!

Yeah it does, it's all a part of homeostasis. Cholestrol molecules increase membrane fluidity during low temperatures, and decrease it in high temperatures, the science and reason to it is obvious, I guess.
2018-2020: Bachelor of Actuarial Science (+ Econometrics), Monash
2021: Bachelor of Commerce (Honours), Econometrics & Financial Mathematics, Monash
2022-2023: Work and some soul-searching

simrat99

  • Trailblazer
  • *
  • Posts: 48
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9308 on: September 25, 2017, 06:51:47 pm »
0
Yeah it does, it's all a part of homeostasis. Cholestrol molecules increase membrane fluidity during low temperatures, and decrease it in high temperatures, the science and reason to it is obvious, I guess.
Thanks!

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9309 on: September 25, 2017, 07:48:27 pm »
0
Hey all, what's the difference between exocytosis and secretion?

LifeisaConstantStruggle

  • Forum Obsessive
  • ***
  • Posts: 324
  • Respect: +104
Re: VCE Biology Question Thread
« Reply #9310 on: September 25, 2017, 08:01:28 pm »
+3
Hey all, what's the difference between exocytosis and secretion?

Hello,
Secretion refers to ANYTHING that's discharged from the body of something (the body of a cell, organ, Pauline Hanson), for a particular function (including excretion, which is a type of secretion)
Exocytosis is more specific and it refers to bulk transport out of the cell via secretory vesicle. (note that exocytosis is a type of secretion).
2018-2020: Bachelor of Actuarial Science (+ Econometrics), Monash
2021: Bachelor of Commerce (Honours), Econometrics & Financial Mathematics, Monash
2022-2023: Work and some soul-searching

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9311 on: September 25, 2017, 08:27:40 pm »
0
Ok thankyou!

ezferns

  • Forum Regular
  • **
  • Posts: 78
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9312 on: September 25, 2017, 08:39:35 pm »
0
When talking about master genes and BMP4, is the variation between species due to differences in the nucleotide sequence of the BMP4 gene or the genes it controls?

LifeisaConstantStruggle

  • Forum Obsessive
  • ***
  • Posts: 324
  • Respect: +104
Re: VCE Biology Question Thread
« Reply #9313 on: September 25, 2017, 08:58:57 pm »
+2
When talking about master genes and BMP4, is the variation between species due to differences in the nucleotide sequence of the BMP4 gene or the genes it controls?

Hello again,
Yes, mutations and differences do exist in bmp4 (the master gene itself is represented with lower case letters), and the only thing that changes is the bmp4 gene itself (more specifically the pro domain region, https://en.wikipedia.org/wiki/Protein_domain). The mutations (which only occur in a specific region) means that the product of the gene is not affected in any way, the protein BMP4 (capital letters) is still the protein itself, but what is affected tho is the location, timing, and persistence of gene expression.
The genes bmp4 control do not change tho, it's just a very specific part of the bmp4 gene that's different.
2018-2020: Bachelor of Actuarial Science (+ Econometrics), Monash
2021: Bachelor of Commerce (Honours), Econometrics & Financial Mathematics, Monash
2022-2023: Work and some soul-searching

ringring

  • Trailblazer
  • *
  • Posts: 39
  • ✞ Philippians 4:13 ✞
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #9314 on: September 25, 2017, 09:15:06 pm »
0
Hello!
For the question... Outline a disadvantage of selective breeding
Would this be a suitable answer: "selective breeding results in less variation in the population overtime which means they can't adapt to changes in the environment"
2016: Further Maths

2017: English, Methods, Chemistry, Biology, HHD