How did you guys go with VCAA 2013? And does anyone know what you would need to get on it for 45 or over?
you needed roughly 98-99/110 for a 45 with near to full scaling sac marks.
VCAA 20135(a) Question: What role do these autoantibodies play in causing the symptoms of an autoimmune disease?
1 markMy Answer: Autoantibodies are specific to self-cells & work on self-cells by bind to them (opsinization) results in phagocytes engulfing and destroying self-material causing symptoms of an auto immune disease.
VCAA Answer: Autoantibodies attack self-cells and the destruction of this tissue leads to the symptoms of the disease.
5(b) Explain why the auto antibody test could be negative even though the genetic screen was positive. (My answer is totally different)
2 marksMy Answer: The teenager may be heterozygous at that gene loci & the trait may be autosomal recessive thus required two faulty alleles to express the phenotype to produce the auto antibodies, therefore did not produce auto antibodies.
VCAA Answer: The genetic screen indicates the potential to develop the disease and the absence of autoantibodies indicates that the disease has not yet been switched on.
8(c)(iii) Explain whether you would expect the same genotype and phenotypes in the offspring if the two genes had been linked.
1 markMy Answer: No the phenotypes and genotypes would be different as some allelic pairs would more likely to be inherited together & some only occurring when crossing over occurs between the gene loci. The phenotype & genotypic ratio would be large: large (parental combinations) & small: small (recombinant combinations
VCAA Answer: Yes. The same genotypes and phenotypes are possible if crossing over/recombination occurred OR
No. Only two types of genotypes and phenotypes are produced, or the majority are of two types.
10(a) What molecular information would the scientist obtain from sequencing RNA?
1 mark
My Answer: The sequence of amino acids exhibited in polypeptides produced by the virus in a host cell.
VCAA Answer: The sequence of nucleotides or bases could be determined.
IMO it was quite a good exam as it differentiated the state really well despite being relatively simple however 2014 exam was pretty much about who will not make stupid mistakes XD
Thanks in advance