H02002 - Study guides, Class notes & Summaries

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This is the final mark scheme

OCR A Level BIOLOGY A Paper 2 June 2024 QUESTION PAPER- H020/02

OCR AS level BIOLOGY A paper 2 June 2024 Final Mark scheme- H020/02

OCR 2024 AS Level Biology A H020/02 Depth in biology Question Paper & Mark Scheme (Merged)

QUESTIONS AND ANSWERS

OCR Biology A (AS) H020_02 Depth in biology June 2024

Pepsin is a protease enzyme with a polypeptide chain containing 327 amino acids. Titin is the largest known protein. It has a polypeptide chain containing at least 92 times more amino acids than pepsin. (i) DNA sequences in genes code for polypeptide molecules such as pepsin and titin. Explain why a process known as transcription is necessary for polypeptide synthesis - ANSWER DNA, copied to mRNA DNA, is too large to leave nucleus Calculate the minimum length of the DNA base sequence r...

Meiosis is a type of nuclear division. Fig. 1.2 shows a photomicrograph of plant cells undergoing meiosis identify the stage of meiosis 1 shown in the cell labelled A - ANSWER prophase (1) Based only on your observations of Fig.1.2, state two reasons for your answer in (b)(i) - ANSWER chromosomes condense chromosomes still not aligned at the equator Another stage of meiosis is metaphase 1. Explain how the organization of homologous chromosomes during metaphase 1 increases genetic varia...

#O C R AS Level Biology A H020/02 Depth in biology May 2023