Study guides, Class notes & Summaries

aqa AS BIOLOGY Paper 1 (7401/1) May 2023 Question Paper. 1. Describe the primary structure of all proteins. 2. This question is about the genetic code. Define universal, non-overlapping and degenerate. 3. Describe how the appearance of the area containing DNA in a TEM image of a eukaryotic cell would differ from that shown in Figure 1. 4. Describe one difference between the structure of DNA in a prokaryotic cell and in a eukaryotic cell. 5. Streptococcus bacteria can infect the lungs when air i...

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 0 1 . 2 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 complementa...

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 0 1 . 2 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 complementa...

AQA AS BIOLOGY Paper 1 7401-1-QP-Biology-AS-15May23

This is the official question paper