(a) Fig. 5.1 shows the structure of a prokaryotic cell. [Figure 5.1]

1. (a)Fig. 5.1 has not been fully labelled to confirm that the cell is prokaryotic. State what other information could be added to two of the labels to confirm that this cell is prokaryotic and not eukaryotic.[2]
2. (b)Some prokaryotes are plant pathogens. Liberibacter is a group of prokaryotic plant pathogens that causes severe damage to a variety of plant crops across the world. Scientists made observations about plants infected with these pathogens compared to uninfected plants: • starch accumulates in the leaves • starch does not accumulate in roots and other storage organs • fruits are smaller • the pathogen is widely distributed throughout the plant and is found in a number of different organs including the root and leaf. The scientists deduced that the pathogen infected the phloem tissue. Suggest why the scientists were able to deduce that the pathogen infected the phloem tissue.[2]
3. (c)DNA and RNA both contain nucleotides with adenine. Complete Table 5.1 to compare: • a DNA nucleotide with adenine • an RNA nucleotide with adenine • ATP. Table 5.1 feature DNA nucleotide with adenine RNA nucleotide with adenine ATP contains nitrogen (yes or no) contains a pyrimidine base (yes or no) number of phosphate groups name of the sugar component[5]

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