People who become infected with human immunodeficiency virus (HIV) are at risk of developing HIV/AIDs, particularly if antiretroviral therapy (ART) is not available. Fig. 2.1 shows that $$\(P\)$$. jirovecii is a unicellular organism. Although the cells of many species of bacteria are the same size as those of $$\(P\)$$. jirovecii, research concluded that the organism is a eukaryote and is not a bacterium. In 1988, analysis of ribosomal RNA (rRNA) resulted in P. jirovecii being classified as a fungus. (i) Studies of the structure of $$\(P\)$$. jirovecii have identified that the cell wall is made of polysaccharides such as chitin and 1,3- $$\(\beta\)$$-D-glucan. Explain why this feature helped scientists to confirm that $$\(P\)$$. jirovecii is not a bacterium. ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (ii) Scientists have identified other features of the cell structure of $$\(P\)$$. jirovecii. Some of these are listed in Table 2.1. Complete each row of Table 2.1 so that the table shows: - four structural features identified in P. jirovecii - one function for each structural feature - whether the structural feature is present $$\((\boldsymbol{\checkmark})\)$$ or absent $$\((X)\)$$ in bacterial cells. Table 2.1

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