VCE Biology Question Thread

[darkz]

Hey can someone plz help me with these questions it would be much appreatied (to do with cellular respiration):
- In glycolysis why is it that only the 6 carbons part of the glucose are broken down and not the 12 hydrogens or 6 oxygens.
- What do you call NADH, ATP, CO2, FADH2 etc?  (can you just refer to all of them as coenzymes or molecules?)

Does anyone know where I can buy the biozone 3&4 workbook like what bookshops around the south-eastern suburbs have them??

Thanks!

Mod edit: Please refrain from double posting. Next time, click the 'modify' button on your first post -- Calebark

Hey, a rather big book store in the south-eastern suburbs is Link Education https://www.linkeducational.com.au/ they're located on 341 Waverley Road
Mount Waverley Vic 3149

[PopcornTime]

what are some errors for a respirometer experiment with germinating seeds? Can anyone confirm the following?

Systematic - water bath faulty

Random - changes in atmospheric pressure

[ellataberner]

Hi I am in year 10 doing Biology 1, 2. And I was just wondering if anyone had any information about the upcoming SACS i will be doing.
Thank you x

[Sine]

Hi I am in year 10 doing Biology 1, 2. And I was just wondering if anyone had any information about the upcoming SACS i will be doing.
Thank you x

best to ask your teacher since it will be different in each school, especailly for units 1 and 2 where the content taught/assesed is quite flexible since there is no single end of year exam for everyone.

[PhoenixxFire]

what are some errors for a respirometer experiment with germinating seeds? Can anyone confirm the following?

Systematic - water bath faulty

Random - changes in atmospheric pressure

Yep those are systematic and random errors. Sorry I don’t know exactly how respirometers work so I can’t suggest any others.

Hi I am in year 10 doing Biology 1, 2. And I was just wondering if anyone had any information about the upcoming SACS i will be doing.
Thank you x

You will have one which will be a prac report - it should be a poster but it may be written. The others will likely all be your standard multiple choice and short answer - but as Sine said it varies depending on your school so it’s best to ask your teacher.

[peachxmh]

Heya, quick question - what is the function/role of acetyl coenzyme A in cellular respiration and how is it created? Btw, would VCAA expect you to know this for the end of year exam? For my SAC this is required knowledge but I'd just like to know how important it is

[Mr West]

hey guys,

can anyone explain to me why animal cells would have more catalase then plant cells?

my guess is that is has something to do with animal cells being more active, therefore having more chemical reactions that produces more hydrogen peroxide that will need to be broken down

thanks

[darkz]

Heya, quick question - what is the function/role of acetyl coenzyme A in cellular respiration and how is it created? Btw, would VCAA expect you to know this for the end of year exam? For my SAC this is required knowledge but I'd just like to know how important it is

Hey,
So Acetyl CoA (2C) is created from each pyruvate (3C) and thus a carbon dioxide molecule is also created. Not really sure about the function of it, as for VCE Biology, you don't actually needs to know the specifics and details about the krebs cycle, only the location, inputs and outputs. Thus for the end of year exam, it would not be expected for you to know this. I've just attached a photo of the krebs cycle I found online, you don't need to know each step, but it should give you a general idea of what its used for

[darkz]

hey guys,

can anyone explain to me why animal cells would have more catalase then plant cells?

my guess is that is has something to do with animal cells being more active, therefore having more chemical reactions that produces more hydrogen peroxide that will need to be broken down

thanks

Hey,
So hydrogen peroxide is actually a by-product of cellular respiration - thus as you said, animals are more active than plants => higher rate of cellular respiration => more hydrogen peroxide needed to be broken down => more catalase

[Poet]

Hi all,

I'm struggling with the reason as to why the receptors for epinephrine (adrenaline) are found on the outside of the cell? Why is this significant?

Thank you so much! <3

[Sine]

Hi all,

I'm struggling with the reason as to why the receptors for epinephrine (adrenaline) are found on the outside of the cell? Why is this significant?

Thank you so much! <3

It is a peptide-amine (probably enough to say protein hormone or protein based in VCE) hormone hence it is a hydprhophilic signal so the receptor must be located on the outside of the cell.

Other signalling molecules have receptors on the inside of the cell and these are hydrophobic (lipophilic - generally steroids) signalling molecules

[Mr West]

Hey guys

heads up, sorry if this has been asked before

just needing an explanation on the "cycling of coenzymes(ATP,NADH and NADPH) as loaded and unloaded forms to move energy, protons and electrons between reactions in the cell"

our textbook, edrolo and teacher barely covered this and feel its important to know as it is its own dot point in the study design

any help would be greatly appreciated. cheers

[darkz]

Hey guys

heads up, sorry if this has been asked before

just needing an explanation on the "cycling of coenzymes(ATP,NADH and NADPH) as loaded and unloaded forms to move energy, protons and electrons between reactions in the cell"

our textbook, edrolo and teacher barely covered this and feel its important to know as it is its own dot point in the study design

any help would be greatly appreciated. cheers

Hey,
So basically the loaded form of NADP+/NAD+ simply refers to it being reduced (oxidation is lose, reduction is gain) and so it gains electrons/protons which they carry from one reaction to another. For example, in photosynthesis, NADPH (loaded form) carries electrons and protons from the light dependent stage to the light independent stage. And then they lose/ give away their electrons so they become oxidised and revert to their former self

[Mr West]

thanks darkdzn,

last question,
would anyone be able to explain what I should talk about in the results section of my prac. I have a table and a graph, just unsure what to write. Like do I just regurgitate what is in the table and graph and explain in my conclusion?

thanks

[persistent_insomniac]

Hey guys so I have an upcoming SAC on cellular respiration and I was wondering what kind of questions I can expect in regards to a prac on yeast fermentation - the effect of sugar in yeast fermentation by measuring the amount of CO2 produced (placing a balloon over the flask). Thanks