OCR 2023 Biology A H020/01: Breadth in biology AS Level Question Paper & Mark Scheme (Merged

2 © OCR 2023 C Constant region D Section A You should spend a maximum of 25 minutes on this section. Write your answer for each question in the box provided. 1 Which statement describes a problem that has resulted from the increased use of antibiotics? A Penicillin can no longer be used to treat infections. B Rates of MRSA infection have increased. C Some bacteria and fungi have evolved resistance to antibiotics. D Viral infections can no longer be treated with antibiotics. Your answer [1] 2 The diagram shows a computer model of the structure of an antibody. A B Which part of the antibody, A, B, C or D, is an antigen-binding site? Your answer [1] 3 © OCR 2023 Turn over N 3 Simpson’s Index of Diversity (D) can be used to estimate the biodiversity of a habitat. D = 1 – ( ∑( n ) 2 ) Scientists calculated D for a grassland habitat. One year later, the scientists calculated D again for the same habitat. The number of plants recorded from one of the species increased from 100 to 400. All the other values remained the same. What would be the result of this change? A Species richness would increase. B The estimate of biodiversity would increase. C The value of D would decrease. D The value of N would decrease. Your answer [1] 4 What is an example of in situ conservation? A A botanical garden B A breeding programme in a zoo C A marine conservation zon