Biology Exam: Answers and Discussion!

[katiesaliba]

Aww...We never learnt that at school so that's more marks lost! 

Wait, do you mean both antigen binding sites on the same antibody to 1 antigen?
That's so annoying  Don't worry though, the exam was so much harder than usual so the A+ cutoff should be lower 

It can be with the same pathogen though right?

Yep! I didn't draw it like that though, so hopefully agglutination wasn't 'required' per se.

[Fingerscrossed]

Wait, do you mean both antigen binding sites on the same antibody to 1 antigen?
That's so annoying  Don't worry though, the exam was so much harder than usual so the A+ cutoff should be lower 

Yep! I didn't draw it like that though, so hopefully agglutination wasn't 'required' per se.

Both my antigen-binding sites of the antibodies were attached to two adjacent antigens on the same pathogen... Is that wrong?

[dankfrank420]

What were you supposed to draw for the complex question?

I just drew four antibodies surrounding one pathogen, then another antibody on each pathogen. None of the antibodies were binding to antigens on two different pathogens however.

UPDATE: sorry for the hold up. running into tech difficulties, the file is too large even when compressed 

How large is it? Could you upload it to the VCE discussion page (if you are a part of it)?

[anat0my]

GUYS. How do you think you went? Honestly, I don't know. Might loose marks here and there for lack of specificity. What'd you guys say for the last question and the one about the twins. What questions did you find hard?

Nonetheless, Biology has been one of the greatest subjects, definitely going to miss it

[Reus]

GUYS. How do you think you went? Honestly, I don't know. Might loose marks here and there for lack of specificity. What'd you guys say for the last question and the one about the twins. What questions did you find hard?

Nonetheless, Biology has been one of the greatest subjects, definitely going to miss it

For the twins one I took a wild guess and said they would share the similarities in genes and protein production however there still will be genetic differences as no individual is identical (unless cloning took place) thus phenotypic differences.

[Lizzy7]

Both my antigen-binding sites of the antibodies were attached to two adjacent antigens on the same pathogen... Is that wrong?

I don't think so, I mean that's how they agglutinate! Take a look at this diagram from the BIOL Notes book

[anat0my]

For the twins one I took a wild guess and said they would share the similarities in genes and protein production however there still will be genetic differences as no individual is identical (unless cloning took place) thus phenotypic differences.

Didn't the question ask why would there be genotypic differences? I thought about saying environmental influences but environment doesn't effect genotype? I said that processes such as crossing over and independent assortment that happen in meiosis causes genotypic differences. But that was a 2 mark question. I think the other mark was for stating mutations occurred which I didn't state. Last minute question for me -.-.

WHAT in the hell was the experimental design question!? how'd u guys go about that curveball?

[milica96]

here we go, more coming

[anat0my]

I don't think so, I mean that's how they agglutinate! Take a look at this diagram from the BIOL Notes book

It was such a struggle to draw this because I drew it in detail such as the heavy chain with the hinges and stuff... if this is what they required then I surely just wasted my time..

[dankfrank420]

Didn't the question ask why would there be genotypic differences? I thought about saying environmental influences but environment doesn't effect genotype? I said that processes such as crossing over and independent assortment that happen in meiosis causes genotypic differences. But that was a 2 mark question. I think the other mark was for stating mutations occurred which I didn't state. Last minute question for me -.-.

WHAT in the hell was the experimental design question!? how'd u guys go about that curveball?

Wait are you talking about the twins or the bees?

The twins are identical - hence they have identical genotypes. However, the question stated that the traits were being studied after 20 years. So although genotypes may be similar, some phenotypic expression may be different due to environmental factors affecting phenotype.

[anat0my]

here we go, more coming

bomb.com

[althepal]

here we go, more coming

You legend!

[anat0my]

Wait are you talking about the twins or the bees?

The twins are identical - hence they have identical genotypes. However, the question stated that the traits were being studied after 20 years. So although genotypes may be similar, some phenotypic expression may be different due to environmental factors affecting phenotype.

OHHH im talking about the BEES! ON THAT NOTE the question for the twins I state that they would develop the traits at a different onset of life or whatever once triggered by something... yeah lol ;n;

[selinasch]

I don't think so, I mean that's how they agglutinate! Take a look at this diagram from the BIOL Notes book

i drew something like that, did we have to label it? it didn't say to 

[soNasty]

fml looking at those answers i already got 2 wrong