Login

Welcome, Guest. Please login or register.

March 30, 2024, 02:28:16 am

Author Topic: VCE Biology Question Thread  (Read 3571896 times)  Share 

0 Members and 11 Guests are viewing this topic.

shivaji

  • Victorian
  • Trendsetter
  • **
  • Posts: 174
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3090 on: September 28, 2014, 08:04:14 am »
0
Perhaps you'd like to offer what you know first and then get someone to have a look at it. :)

hahaha good idea lol

so basically: When the threshold value is reached, sodium channels open, causing an influx of sodium ions into the axon, resulting in the inside of the cell to be slightly positive compared to the outside. This is known as "depolarisation," and allows the impulse to be propagated down the axon. As too much Na+ has entered, the cell tries to combat this by opening up the potassium channels, allowing potassium too leave the cell. (repolarisation) Too much potassium ions leave the cell, and the axon enters what is known as a "refractory period," and does not respond to any stimuli until it is restored back to normal?

not sure if right though

vox nihili

  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5343
  • Respect: +1447
Re: VCE Biology Question Thread
« Reply #3091 on: October 03, 2014, 10:16:19 am »
0
hahaha good idea lol

so basically: When the threshold value is reached, sodium channels open, causing an influx of sodium ions into the axon, resulting in the inside of the cell to be slightly positive compared to the outside. This is known as "depolarisation," and allows the impulse to be propagated down the axon. As too much Na+ has entered, the cell tries to combat this by opening up the potassium channels, allowing potassium too leave the cell. (repolarisation) Too much potassium ions leave the cell, and the axon enters what is known as a "refractory period," and does not respond to any stimuli until it is restored back to normal?

not sure if right though

The only thing to note is that at the height of depolarisation, the sodium channels close and the potassium channels open. So you get a double whammy essentially. But otherwise, fantastic :)
2013-15: BBiomed (Biochemistry and Molecular Biology), UniMelb
2016-20: MD, UniMelb
2019-20: MPH, UniMelb
2021-: GDipBiostat, USyd

Reus

  • Victorian
  • ATAR Notes Superstar
  • ******
  • Posts: 2125
  • Respect: +135
Re: VCE Biology Question Thread
« Reply #3092 on: October 03, 2014, 10:24:49 am »
0
Could someone explain the basics of Clonal Expansion? Everywhere I look is confusing and too complex haha
2015: Bachelor of Science & Bachelor of Global Studies @ Monash University

Rishi97

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1042
  • Respect: +40
  • School: The University of Melbourne
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #3093 on: October 03, 2014, 11:51:17 am »
0
Could someone explain the basics of Clonal Expansion? Everywhere I look is confusing and too complex haha

clonal expansion just refers to the differentiation of B cells which are part of the humoral response. B cells can produce 2 cells including B-plasma cells and B-memory cells. Here is clonal expansion in a nut shell. Not too much detail is given so could someone please elaborate?
2014: VCE completed
2015-2017: BSc at Melb Uni

DREAM, BELIEVE, ACHIEVE!!!

Reus

  • Victorian
  • ATAR Notes Superstar
  • ******
  • Posts: 2125
  • Respect: +135
Re: VCE Biology Question Thread
« Reply #3094 on: October 03, 2014, 12:14:32 pm »
0
clonal expansion just refers to the differentiation of B cells which are part of the humoral response. B cells can produce 2 cells including B-plasma cells and B-memory cells. Here is clonal expansion in a nut shell. Not too much detail is given so could someone please elaborate?
Would you say T helper cells initiate clonal expansion?
2015: Bachelor of Science & Bachelor of Global Studies @ Monash University

howlingwisdom

  • Victorian
  • Trendsetter
  • **
  • Posts: 163
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3095 on: October 03, 2014, 01:01:15 pm »
0
Would you say T helper cells initiate clonal expansion?
Yes. They would have to initiate clonal expansion of certain B-cells/T-cells (that have a specific antibody-like receptor to the antigen)
VCE: 2014-2015 (English Language, Maths Methods, Biology, Chemistry, French, Latin)

2016: BMedSt + MD at Bond University (2020)

ValiantIntellectual

  • Guest
Re: VCE Biology Question Thread
« Reply #3096 on: October 03, 2014, 02:21:59 pm »
0
My brother told me that microtubules help chromosomes during mitosis. Is this true? I know it is a bit out of the course but the function of microtubules is testable.

Sense

  • Victorian
  • Trendsetter
  • **
  • Posts: 180
  • Respect: +1
  • School Grad Year: 2016
Re: VCE Biology Question Thread
« Reply #3097 on: October 03, 2014, 02:50:02 pm »
0
Embryonic stem cells, unlike adult stem cells, ______

A)can be stimulated to become a particular type
B)Can be divided Indefinitely
C)Are difficult to obtain
D)Pose no ethical issue when used in the laboratory
2013 - [CCNA] [CCNP]

2015 - Chemistry - Biology

2016 - English - Methods - Specialist Maths

dankfrank420

  • Victorian
  • Forum Leader
  • ****
  • Posts: 892
  • Respect: +52
Re: VCE Biology Question Thread
« Reply #3098 on: October 03, 2014, 06:50:47 pm »
0
How do you guys tackle experimental design questions? What's your "formula"?

Rishi97

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1042
  • Respect: +40
  • School: The University of Melbourne
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #3099 on: October 03, 2014, 07:13:13 pm »
0
How do you guys tackle experimental design questions? What's your "formula"?

haha I always stuff up these questions so I wish there was a formula. I'm not too good with these so I can't give you any great advice. But here is a tip: always always always include your sample size
2014: VCE completed
2015-2017: BSc at Melb Uni

DREAM, BELIEVE, ACHIEVE!!!

Rishi97

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1042
  • Respect: +40
  • School: The University of Melbourne
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #3100 on: October 03, 2014, 07:14:01 pm »
0
What conditions are required for fossilisation to occur?
2014: VCE completed
2015-2017: BSc at Melb Uni

DREAM, BELIEVE, ACHIEVE!!!

dankfrank420

  • Victorian
  • Forum Leader
  • ****
  • Posts: 892
  • Respect: +52
Re: VCE Biology Question Thread
« Reply #3101 on: October 03, 2014, 07:23:21 pm »
0
What conditions are required for fossilisation to occur?

- Hard objects (such as bone) are more easily preserved
- Rapid burial (protect from scavengers)
- Limited oxygen,water or both
- Abundance of minerals to replace organic substance
- No disturbance of remains so mineralisation can occur

Marine conditions generally suit all this criteria, so that's why there are so many fossils of marine life.

Reus

  • Victorian
  • ATAR Notes Superstar
  • ******
  • Posts: 2125
  • Respect: +135
Re: VCE Biology Question Thread
« Reply #3102 on: October 03, 2014, 07:27:48 pm »
0
haha I always stuff up these questions so I wish there was a formula. I'm not too good with these so I can't give you any great advice. But here is a tip: always always always include your sample size
Large sample size at that.

2015: Bachelor of Science & Bachelor of Global Studies @ Monash University

nerdmmb

  • Guest
Re: VCE Biology Question Thread
« Reply #3103 on: October 03, 2014, 07:30:25 pm »
0
I had a few questions from unit 3.

1. What is the purpose of the enzyme rubisco in photosynthesis? And do we need to know this?

2. What is the function of the thylakoid space in chloroplasts during photosynthesis?


And finally, for human evolution, would it be suffice to know the differences between the homo species and the primate groups? Thanks!

shivaji

  • Victorian
  • Trendsetter
  • **
  • Posts: 174
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #3104 on: October 03, 2014, 07:34:18 pm »
+1
I had a few questions from unit 3.

1. What is the purpose of the enzyme rubisco in photosynthesis? And do we need to know this?

2. What is the function of the thylakoid space in chloroplasts during photosynthesis?


And finally, for human evolution, would it be suffice to know the differences between the homo species and the primate groups? Thanks!

1) no, we don't have to know it

2) if you are referring to the thylakoid membranes, i believe that's where the light dependent  reactions of photosynthesis occur. (they make up the grana)