Describe deamination in the liver as the removal of the nitrogen-containing part of amino acids, resulting in the formation of urea
1 Answer Describe the role of the liver in the assimilation of amino acids by converting them to proteins
1 Answer Outline the function of a nephron and its associated blood vessels, limited to: (a) the role of the glomerulus in the filtration from the blood of water, glucose, urea and ions (b) the role of the nephron in the reabsorption of all of the glucose, some of the ions and most of the water back into the blood (c) the formation of urine containing urea, excess water and excess ions (details of these processes are not required)
1 Answer Explain the need for excretion, limited to toxicity of urea
1 Answer Identify, on diagrams, the kidneys, ureters, bladder and urethra and state the function of each (the function of the kidney should be described simply as removing urea and excess salts and water from the blood as urine)
1 Answer State that urea is a toxic waste product produced in the liver from the breakdown of excess amino acids
1 Answer State that carbon dioxide is a waste product of respiration, which is excreted through the lungs
1 Answer Describe excretion as the removal of toxic materials and the waste products of metabolism from organisms
1 Answer Outline how HIV affects the immune system, limited to: decreased lymphocyte numbers and reduced ability to produce antibodies, which weakens the immune system
1 Answer Describe that memory cells are not produced in passive immunity
1 Answer
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