Login

Welcome, Guest. Please login or register.

March 29, 2024, 03:42:04 pm

Author Topic: VCE Biology Question Thread  (Read 3571265 times)  Share 

0 Members and 5 Guests are viewing this topic.

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1050 on: March 11, 2014, 07:22:22 pm »
0
Can someone please define 'optimum range', in terms of enzymes?

Because I thought this was a bit different between the definition of the optimum range, we learnt for abiotic factors in Biology Units 1/2.

Is this true?

Thanks! :)

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 #1051 on: March 11, 2014, 07:26:37 pm »
0
Can someone please define 'optimum range', in terms of enzymes?

Because I thought this was a bit different between the definition of the optimum range, we learnt for abiotic factors in Biology Units 1/2.

Is this true?

Thanks! :)

I'll attempt this:
Optimum range is the specific environment range in which an enzyme works best. This so called "environment" may be temperature, pH etc. So there is a specfic range in which an enzyme best functions at
Pls correct me if I'm wrong
2014: VCE completed
2015-2017: BSc at Melb Uni

DREAM, BELIEVE, ACHIEVE!!!

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1052 on: March 11, 2014, 07:30:13 pm »
0
My textbook says that proteins influence the pH of a solution by donating hydrogen ions or hydroxyl ions. I thought that hydroxide ions made a solution more alkaline, not hydroxyl?

Or are they the same thing?

Thanks!

Tyleralp1

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 450
  • Braaaaaaap
  • Respect: +12
Re: VCE Biology Question Thread
« Reply #1053 on: March 11, 2014, 07:48:47 pm »
+1
An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxyl ions is shifted. Now there are more hydrogen ions than hydroxyl ions in the solution. This kind of solution is acidic.

A base is a substance that accepts hydrogen ions. When a base is dissolved in water, the balance between hydrogen ions and hydroxyl ions shifts the opposite way. Because the base "soaks up" hydrogen ions, the result is a solution with more hydroxyl ions than hydrogen ions. This kind of solution is alkaline.
The GOAL: Attain a RAW study score of 40+ in all my subjects.

Courses I would like to study in order of preference include: Bachelor of Medicine/Bachelor of Surgery (MBBS), Bachelor of Biomedicine or Bachelor of Science.

2014: Biology [42]
2015: English Language [??] | Chemistry [??] | Physics [??] | Mathematical Methods (CAS) [??] | Specialist Mathematics [??]

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1054 on: March 11, 2014, 07:53:25 pm »
0
An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxyl ions is shifted. Now there are more hydrogen ions than hydroxyl ions in the solution. This kind of solution is acidic.

A base is a substance that accepts hydrogen ions. When a base is dissolved in water, the balance between hydrogen ions and hydroxyl ions shifts the opposite way. Because the base "soaks up" hydrogen ions, the result is a solution with more hydroxyl ions than hydrogen ions. This kind of solution is alkaline.

ohhh thanks! :) Makes more sense now!

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1055 on: March 11, 2014, 07:54:02 pm »
0
I'll attempt this:
Optimum range is the specific environment range in which an enzyme works best. This so called "environment" may be temperature, pH etc. So there is a specfic range in which an enzyme best functions at
Pls correct me if I'm wrong

Thankyou! :)

DJA

  • Victorian
  • Forum Leader
  • ****
  • Posts: 617
  • Literature is the question minus the answer.
  • Respect: +201
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #1056 on: March 11, 2014, 08:49:18 pm »
+1
Do cofactors and coenzymes simply just fill in active site of enzyme and what else do they do (required in VCE biology)

Coenzymes and cofactors  (VCE level)
Having been confused about these two terms in the past, I thought I had better post.
VCE level biology is actually quite contradictory at times and even though Tyleralp1's definitions are perfectly correct, they actually may not get you the marks in VCE level bio because VCE bio has weird definitions at times.


Definition of a cofactor and its function: A cofactor is a molecule (either a coenzyme or inorganic ion) which assists an enzyme with its biological activity. A cofactor increases the affinity of the enzyme to the substrate in a metabolic reaction and is required to be present for that enzyme to function correctly.

Definition of coenzyme: Essentially a cofactor which is biological in nature - for example Vitamin C.
Definition of inorganic ion: Essentially a cofactor which is non-biological in nature - for example Fe2+

That's as much detail as you will likely need. Hope that helped clarify things.
2014 - English (50, Premier's Award)| Music Performance (50, Premier's Award) | Literature (46~47) | Biology (47) | Chemistry (41) |  MUEP Chemistry (+4.5)  ATAR: 99.70

Griffith University Gold Coast Queensland
2015 - 2017 Bachelor of Medical Science (BMedSc)
2017 - 2021 Doctor of Medicine (MD)

DJA's Guide to Language Analysis (Section C)
DJA's guide on the topic of English Expression (Text response)

Blurple

  • Victorian
  • Adventurer
  • *
  • Posts: 5
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1057 on: March 11, 2014, 09:10:57 pm »
0
I'm in year 11 doing biology 3/4. Well today I had my first SAC and it went really bad. Yes I reckon I passed and got 50%. It was on Affects of temperature and pH on amylase. The thing is the sheet had told us it was a write up. So I had literally memorized the Aim, Hypothesis,Materials + Methods etc. None of that happened. There was no write up. We got sheets full of questions about what we did at GTAC. I'm just so disappointed as to how other classes got told they were going to be tested on how temperature affected amylase not both temp and pH. And they also got told they would have to draw 2 graphs as well. I'm just devastated that I had to memorize a whole bunch of things without me being properly told whats happening. I know how things work now and would like to ace all my other SACS + the exam itself. Is it still possible? I'm just so. In biology do you ever do a write up, by write up I mean a lab report. I didnt know things were going to turn out this way. Is it still possible for me to get a study score of 35 if I do well in all my other SACS/Exam this year. By the way my next SAC is on Dialysis Tubing. What type of questions are do they ask on the SAC? And its not a lab report we have to write? Is it? I'm just really pissed off as to how our teacher didnt tell us some things and other students in other classes got told these thing.

Jason12

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 497
  • Respect: +15
  • School: WCC
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #1058 on: March 11, 2014, 09:44:48 pm »
0
Is it still possible for me to get a study score of 35 if I do well in all my other SACS/Exam this year.

yes definitely bio sacs for unit 3 and 4 are only worth 40% of the total study score so if you divide by the amount of sacs for both units you will find it is a very small percentage. As long as you do well on the exam you will be fine
2014 ATAR - 88

2015 sem 1 - Bachelor of Business (Accounting/Banking & Finance) - Monash

2015 sem 2 - Present: Bachelor of Commerce (Accounting/Finance), Diploma of Languages (Chinese) - Monash

Jason12

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 497
  • Respect: +15
  • School: WCC
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #1059 on: March 11, 2014, 09:46:25 pm »
0
what is a simple way to explain the induced fit model and what exactly is the active site? Is it just the shape of a molecule that fits with the substrate?
2014 ATAR - 88

2015 sem 1 - Bachelor of Business (Accounting/Banking & Finance) - Monash

2015 sem 2 - Present: Bachelor of Commerce (Accounting/Finance), Diploma of Languages (Chinese) - Monash

shadows

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 455
  • Respect: +22
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #1060 on: March 12, 2014, 08:34:15 am »
0
I'm in year 11 doing biology 3/4. Well today I had my first SAC and it went really bad. Yes I reckon I passed and got 50%. It was on Affects of temperature and pH on amylase. The thing is the sheet had told us it was a write up. So I had literally memorized the Aim, Hypothesis,Materials + Methods etc. None of that happened. There was no write up. We got sheets full of questions about what we did at GTAC. I'm just so disappointed as to how other classes got told they were going to be tested on how temperature affected amylase not both temp and pH. And they also got told they would have to draw 2 graphs as well. I'm just devastated that I had to memorize a whole bunch of things without me being properly told whats happening. I know how things work now and would like to ace all my other SACS + the exam itself. Is it still possible? I'm just so. In biology do you ever do a write up, by write up I mean a lab report. I didnt know things were going to turn out this way. Is it still possible for me to get a study score of 35 if I do well in all my other SACS/Exam this year. By the way my next SAC is on Dialysis Tubing. What type of questions are do they ask on the SAC? And its not a lab report we have to write? Is it? I'm just really pissed off as to how our teacher didnt tell us some things and other students in other classes got told these thing.

Don't fret. If you are willing to work hard for the rest of the year and ace the exams then getting a 35+ is very achievable :).
Every school has different SACS so it would be best to ask your teacher about the layout and structure of the SAC.
Eg: ask if you will have to write a full discussion or is it structured like a test etc.....

JadedBlack

  • Victorian
  • Adventurer
  • *
  • Posts: 6
  • Stuck in Perpetual Obscurity
  • Respect: 0
  • School: Brunswick Secondary College
  • School Grad Year: 2014
Re: VCE Biology Question Thread
« Reply #1061 on: March 12, 2014, 05:28:47 pm »
0
If a question involving the products of glycolysis is asked; is it better to say 4 ATP molecules are produced, or just 2? My teacher said that we should answer with 2, but I'm unsure whether that would be considered the correct answer seeing as it's a net of 2
2014 Units 3&4: English | Maths Methods | Chemistry | Biology | Psychology

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1062 on: March 12, 2014, 06:39:35 pm »
0
How is the active site of enzymes formed?


grannysmith

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1303
  • Crisp and juicy.
  • Respect: +66
Re: VCE Biology Question Thread
« Reply #1063 on: March 12, 2014, 06:50:45 pm »
0
If a question involving the products of glycolysis is asked; is it better to say 4 ATP molecules are produced, or just 2? My teacher said that we should answer with 2, but I'm unsure whether that would be considered the correct answer seeing as it's a net of 2
I'd say 2, but it depends what it's asking; a net gain of 2 ATP or a total of 4 ATP produced.

How is the active site of enzymes formed?
It is formed by the various intermolecular bonds within the tertiary structure of the protein, as the tertiary structure largely determines the function of the enzyme

RazzMeTazz

  • Victorian
  • Forum Leader
  • ****
  • Posts: 673
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #1064 on: March 12, 2014, 07:24:37 pm »
0
Hi, I just did the enzyme liver prac today that involved placing fresh liver pieces in hydrogen peroxide and measuring the height of the bubbles present.

I was wondering, what are the bubbles that are produced?
Is it the water that is formed as a result of hydrogen peroxide being broken down into oxygen and water?

Thanks