Paper 1 AQA Biology AS-level Exam
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Table 1 shows features of a bacterium and the human immunodeficiency virus (HIV) particle. Complete Table 1 by putting a tick () where a feature is present. [2 marks] Table 1 Feature ... Bacterium Human immunodeficiency virus (HIV) particle RNA Cell wall Enzyme molecules Capsid . When HIV infects a human cell, the following events occur. • A single-stranded length of HIV DNA is made. • The human cell then makes a complementary strand to the HIV DNA. The complementary strand is made in the same way as a new complementary strand is made during semi-conservative replication of human DNA. Describe how the complementary strand of HIV DNA is made. [3 marks] Do not write outside the box 0 1 . 3 Contrast the structures of DNA and mRNA molecules to give three differences. [3 marks] 1 2 3 Turn over for the next question [Show More]
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