Biology Exam Chat + Exam Copy + Answers (now)

[LukeMcA]

For question (SA) 5e) i. I had Frame shift (single-base substitution). I accidentally forgot to cross out the word frame shift prior to the exam finishing. Because I mentioned the single-base substitution, will I still get the mark? :/ Stupid mistake.

[Panicmode]

I agree on you for the rest of your answers, but I remember hearing either from douchy or another source that gene therapy doesn't replace the defective allele but the normal allele is simply introduced?

I just googled it and the definition of gene therapy is;

"The transplantation of normal genes into cells in place of missing or defective ones in order to correct genetic disorders."

Therefore, the answer is B.

Gene therapy delivers functional genes to overcome defective alleles but it doesn't replace the allele physically?
From the wording of the question, it's saying it replaces it physically. I may be wrong.

Technically that's correct but "DNA replacement" isn't a specific biological term. I'm like 95% sure the answer is B.

For question (SA) 5e) i. I had Frame shift (single-base substitution). I accidentally forgot to cross out the word frame shift prior to the exam finishing. Because I mentioned the single-base substitution, will I still get the mark? :/ Stupid mistake.

Hopefully. I have however read on past examination reports that if the correct answer is given followed by incorrect information no marks were awarded :/

[KOM]

I agree on you for the rest of your answers, but I remember hearing either from douchy or another source that gene therapy doesn't replace the defective allele but the normal allele is simply introduced?

I just googled it and the definition of gene therapy is;

"The transplantation of normal genes into cells in place of missing or defective ones in order to correct genetic disorders."

Therefore, the answer is B.

Gene therapy delivers functional genes to overcome defective alleles but it doesn't replace the allele physically?
From the wording of the question, it's saying it replaces it physically. I may be wrong.

Technically that's correct but "DNA replacement" isn't a specific biological term. I'm like 95% sure the answer is B.

I was going to put gene therapy too because it was the obvious answer but there was one question in past exam where the answer was.. "Multiple allelic" which seemed pretty stupid too.. I'm probably looking into it too much LOL. Doesn't matter anyway. Thanks for your input

[ezye21]

extened response answers anyone ?

[Panicmode]

extened response answers anyone ?

extended response solutions anyone ?

Lexitu and connectedu is working on it now

I was going to put gene therapy too because it was the obvious answer but there was one question in past exam where the answer was.. "Multiple allelic" which seemed pretty stupid too.. I'm probably looking into it too much LOL. Doesn't matter anyway. Thanks for your input

...But multiple allelic is a biological term. It refers to a trait controlled at one gene locus by many alleles shown as discontinuous variation. Anyway, it's one question, I wouldn't worry about it too much.

[Bing 101]

5 bi (I think). Why couldn't the gel and restriction enzymes be used?

[xiaoselena]

For Question  7c ii) Outline 2 types of evidence, other than DNA analysis, that can be used to determine the relatedness and age of early hominins.

Is it possible to gain marks if i wrote : larger cranial capacity in younger hominins & More prominent brow ridges in younger hominins??

I know I've screwed this question up, but maybe its possible? Desperate for marks~ Made 2 damned careless mistakes in MC Arghhh

[LukeMcA]

I said because it was only a single-base substitution, so the difference wouldn't be able to be detected using Gel Electrophoresis (the fragments would look virtually identical).

[Panicmode]

I said because it was only a single-base substitution, so the difference wouldn't be able to be detected using Gel Electrophoresis (the fragments would look virtually identical).

Yesh, this is what I wrote = D

[LukeMcA]

For Question  7c ii) Outline 2 types of evidence, other than DNA analysis, that can be used to determine the relatedness and age of early hominins.

Is it possible to gain marks if i wrote : larger cranial capacity in younger hominins & More prominent brow ridges in younger hominins??

I know I've screwed this question up, but maybe its possible? Desperate for marks~ Made 2 damned careless mistakes in MC Arghhh

We're only human ;P Making mistakes is natural. If you never made mistakes, you might as well be a computer.

In regards to your question... I talked about Stratigraphy (Position of Superposition) and how that could be used to gain the relative age of the hominin fossil (e.g. oldest stratum situated at the bottom, progressively younger strata lie above it). I also talked about the Principle of Correlation (Which was a mistake, I should've talked about Radiometric dating...)

[TheEscapist]

Restriction enzymes question, i answered that because it was a substitution mutation the allele for normal and mutated will be the same length. Thus will appear as the same band pattern on Gel Electrophoresis and you wouldnt be able to identify between them.
However, another dodgy question. What if the restriction enzyme cut at the sequence that was changed, this would cause one to cut to different sizes and the other allele to not.
Again. VCAA.

[Panicmode]

Restriction enzymes question, i answered that because it was a substitution mutation the allele for normal and mutated will be the same length. Thus will appear as the same band pattern on Gel Electrophoresis and you wouldnt be able to identify between them.
However, another dodgy question. What if the restriction enzyme cut at the sequence that was changed, this would cause one to cut to different sizes and the other allele to not.
Again. VCAA.

One base pair is not gonna make a noticeable change. Your answer was correct.

[LukeMcA]

I said because it was only a single-base substitution, so the difference wouldn't be able to be detected using Gel Electrophoresis (the fragments would look virtually identical).

Yesh, this is what I wrote = D

Yay ^_^

[xiaoselena]

Restriction enzymes question, i answered that because it was a substitution mutation the allele for normal and mutated will be the same length. Thus will appear as the same band pattern on Gel Electrophoresis and you wouldnt be able to identify between them.
However, another dodgy question. What if the restriction enzyme cut at the sequence that was changed, this would cause one to cut to different sizes and the other allele to not.
Again. VCAA.

One base pair is not gonna make a noticeable change. Your answer was correct.

But if u cut in the middle of the mutation, one would produce 2 fragments and the other would be only 1 fragment... And that would be identifiable, right?

[charsiuvce]

What did everyone say for the last question...Q7 part d?
for i) exposure to oxygen to it decays faster
     ii) undisturbed by other animals
thats what i said anyway =/