H02002 - Study guides, Revision notes & Summaries
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AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 - Afternoon EXAM QUESTIONS AND AMSWERS 100% CORRECT!
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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...
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AS Level Biology A H020/02 Depth in biology Tuesday 6 June 2017 - Afternoon EXAM QUESTIONS AND ANSWERS 100% ACCURATE!(GRADED A+)
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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...
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#O C R AS Level Biology A H020/02 Depth in biology May 2023
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#O C R 
AS Level Biology A 
H020/02 Depth in biology 
May 2023
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H020/02, Depth in biology (AS/A level), June 2023/2024 computing Administrator
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). Aphids are small insects that feed on the sap that is translocated through the plant in the phloem. 
These insects insert their fine mouthparts, stylets, into phloem tissue and allow the sap to flow out of the phloem. 
 
One method of collecting sap is to allow the aphid to feed as shown in Fig. 1. 
 
 
 
Fig. 1.1 
 
The aphid is then anaesthetised and the stylet is cut off close to the aphid’s head. The sap can then be collected and analysed. 
 
A researcher analysed the sap collected and ...
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OCR Biology A (AS) H020_02 Depth in biology question-paper May 2024
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OCR Biology A (AS) H020_02 Depth in biology question-paper May 2024
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OCR Biology A (AS) H020_02 Depth in biology mark-scheme May 2024
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OCR Biology A (AS) H020_02 Depth in biology mark-scheme May 2024
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Biology A H020/02: Depth in biology AS Level
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Biology A 
H020/02: Depth in biology 
AS Level
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OCR AS BIOLOGY A PAPER 2 MARK SCHEME 2024 (H020/02: Depth in biology)
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OCR AS BIOLOGY A PAPER 2 MARK SCHEME 2024 (H020/02: Depth in biology)
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2024 AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 2024 FINAL UPDATE PASS A+
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2024 AS Level Biology A 
H020/02 Depth in biology 
Monday 4 June 
FINAL UPDATE PASS A+
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