Biology > Higher Education > AS Level Biology A Breadth in biology September 23 2020 (All)

AS Level Biology A Breadth in biology September 23 2020

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INSTRUCTIONS • Use black ink. You may use an HB pencil for graphs and diagrams. • Complete the boxes above with your name, centre number and candidate number. • Answer all the questions. •... Where appropriate, your answers should be supported with working. Marks may be given for a correct method even if the answer is incorrect. • Write your answer to each question in the space provided. • Additional paper may be used if required but you must clearly show your candidate number, centre number and question number(s). • Do not write in the bar codes. INFORMATION • The total mark for this paper is 70. • The marks for each question are shown in brackets [ ]. • This document consists of 24 pages. © OCR 2020 [601/4261/3] DC (…) H020/01 Turn over You may use: • a scientific or graphical calculator First name Last name Centre number Candidate number2 © OCR 2020 H020/01 Section A You should spend a maximum of 25 minutes on this section. Answer all the questions. 1 Young mammals receive antibodies in their mother’s milk. This is an example of which type of immunity? A artificial active immunity B artificial passive immunity C natural active immunity D natural passive immunity Your answer [1] 2 Which of the following descriptions is correct? A Vaccination gives long-term protection, immunisation gives short-term protection. B Vaccination involves injection of antigenic material and immunisation is the process of developing immunity. C Vaccination involves injection of antigenic material, immunisation is injection of antibodies. D Vaccination and immunisation have the same meaning. Your answer [1] 3 When you listen to a human heartbeat through a stethoscope you can hear a two stage ‘lub–dub’ sound. Which of the following causes the first ‘lub’ component? A closing of the atrioventricular valves B sound of blood rushing into the atria C sound of blood rushing into the ventricles D closing of semilunar valves Your answe [Show More]

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