Biology > EXAM REVIEW > >_AS Level Biology A_H020/02 Question Paper June 2018 | Depth in Biology (All)

>_AS Level Biology A_H020/02 Question Paper June 2018 | Depth in Biology

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OCR_AS Level Biology A_H020/02 Question Paper June 2018 | Depth in Biology (a) Fig. 1.1 shows the general structure of an amino acid. U V H H H O O H C R group C N Fig. 1.1 (i) State the ... names of the groups labelled U and V. U ........................................................................................................................................ V ..................................................... Fig. 1.2 shows a representation of a short polypeptide chain made from three amino acids. Valine Alanine Glycine Bond W Fig. 1.2 Name bond W and state what type of reaction takes place to form this bond. Name of bond W ............................................................................................................... Type of reaction ................................................................................................................. [1] (b) 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. ........................................................................................................................................... ........................................................................................................................................... .................................................................................................................CONTINUED [Show More]

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