HBS 2012 marking key.pdf - HBS3 2012 marking key (student...

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HBS3 2012 marking key (student version)Section One: Multiple-choice questions1B6D11B16A21B26D2A7B12B17A22D27C3C8B13A18C23D28B4D9C14A19D24A29D5C10D15C20A25C30AText in grey (like this) are for MCQ that are out of syllabus or without a picture.~*~Section Two: Short-answer questionsQuestion 31 (10 marks)(a)Complete the table below, describing the different types of immunity. (4 marks)
(b)(i)What action of antibodies does the diagram represent? (1 mark)
(b)(ii)Describe three (3) other ways in which antibodies can act on pathogens to help fight infection. (3 marks)(b)(iii)Name the type of lymphocyte responsible for the production of antibodies. (1 mark)
(c)Identify one (1) risk associated with the production or use of vaccines. (1 mark)
Question 32 (12 marks)(a)Suggest a hypothesis this experiment was designed to test. (1 mark)
(b)What role does a placebo play in a scientific experiment? (1 mark)(c)Apart from those mentioned in the experiment, suggest two (2) variables that would need to be controlled to
ensure that this experiment was reliable. (2 marks)

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Term
Fall
Professor
NoProfessor
Tags
Population Genetics, Medulla oblongata

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