OCR A Level Biology A H420/03 Unified biology June 2022

Document Content and Description Below

A Level Biology A H420/03 Unified biology June 2022 Time allowed: 1 hour 30 minutes INSTRUCTIONS • Use black ink. You can use an HB pencil, but on... ly for graphs and diagrams. • Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 70. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 24 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2022 [601/4260/1] DC (ST/CT) 301309/5 OCR is an exempt Charity Turn over Answer all the questions. 1 The heart can be affected by a variety of disorders, some of which involve the immune system. (a) Fig. 1.1 shows the roles of three different types of antibody, labelled R, S and T. R Antibody Pathogen Receptor White blood cell S Antibody Pathogen T Harmful molecules released by pathogens Antibody Fig. 1.1 State the names of the three different types of antibody shown in Fig. 1.1. R ............................................................................................................................................... S ............................................................................................................................................... T ............................................................................................................................................... [3] (b) A condition called rheumatic heart disease can occur when a person’s antibodies attack antigens on their own heart cells. State the name of the type of disease represented by rheumatic heart disease. [Show More]

Last updated: 1 year ago

Preview 1 out of 27 pages