HSC 2016 Biology Marathon (1 Viewer)

[dre_877]

With just around a month left till the bio hsc exam, i thought i'd make a thread where we can ask questions we may have problems with or those we may predict will appear in the exam, as i noticed that there wasn't a thread already made.
So basically, answer the question and then ask a new one.

I'll start us off,

Explain the relationship between the cause and ONE symptom of ONE named non-infectious disease. (4 marks)

 

[sourmilk]

With just around a month left till the bio hsc exam, i thought i'd make a thread where we can ask questions we may have problems with or those we may predict will appear in the exam, as i noticed that there wasn't a thread already made.
So basically, answer the question and then ask a new one.

I'll start us off,

Explain the relationship between the cause and ONE symptom of ONE named non-infectious disease. (4 marks)

This thread looks awfully lonely

Kwashiorkor is a severe form of malnutrition cause by a protein-deficient diet, and it occurs in developing countries, where rice and starchy foods are the basic diet. The symptoms of Kwashiorkor involves a child having puffy legs, distended abdomen, poor quality skin and hair, an enlarged liver and mental disabilities. The disease is also associated with poverty which is a much more complex issue; aid programs may help address the poverty and therefore prevent the issue. However, the treatment/management basically involves the need to provide a protein-rich diet.

Differentiate between T-Cells and B-Cells and describe their role in the immune system (4 marks)

 

[dre_877]

This thread looks awfully lonely

Kwashiorkor is a severe form of malnutrition cause by a protein-deficient diet, and it occurs in developing countries, where rice and starchy foods are the basic diet. The symptoms of Kwashiorkor involves a child having puffy legs, distended abdomen, poor quality skin and hair, an enlarged liver and mental disabilities. The disease is also associated with poverty which is a much more complex issue; aid programs may help address the poverty and therefore prevent the issue. However, the treatment/management basically involves the need to provide a protein-rich diet.

Differentiate between T-Cells and B-Cells and describe their role in the immune system (4 marks)

Overall, good answer, but I think you could have put more detail in regards to the actual relationship between the cause and symptom, I haven’t learnt about kwashiorkor but another example, in terms of down syndrome, a symptom would be flat facial features or a shorter neck, and then relate this to the cause which is a chromosomal mutation such as trisomy 21 wherein the mutation leads to the generation of new alleles which may be expressed in the phenotype, ie. Flat facial features or a shorter neck.

Anyways, T cells and B cells are both components of the immune response. T cells are a type of lymphocyte that are produced in the bone marrow and mature in the thymus gland, whereas B cells are produced and mature in the bone marrow. T cells have surface receptors whereby they are able to recognise foreign antigens. When detected, they release cytokines which allow for production of clone helper t-cells. Helper t-cells then release interleukins which allows for production of cytotoxic t-cells which destroy the pathogen, and B cells. B cells produce plasma cells which make antibodies and thence form the antigen-antibody complex and deactivate the foreign antigen. Also, memory B and T cells remain in the body and allow for a quicker immune response if the body is invaded by the same foreign antigen. Hence B and T cells play an important role in the immune system.

Outline the contributions of Macfarlane Burnet in the understanding of the immune system (3 marks)