IB Biology HL A2.2.5 Prokaryote Cell Structure Questions

Practise IB Biology HL A2.2.5 by identifying prokaryote structures and comparing circular DNA, plasmids, pili, flagella and cell walls with eukaryotes.

Exam points

Identify and label the cell wall, plasma membrane, cytoplasm, nucleoid, plasmids, pili and flagella in a prokaryotic cell.
Compare naked circular prokaryotic DNA and chromosomes with linear, histone-associated eukaryotic chromosomes.
Explain how prokaryotic structures such as pili, flagella, ribosomes and plasmids support cell functions or gene transfer.
Describe or distinguish bacterial cell-wall structure, including Gram-positive and Gram-negative layers, where shown.

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Study A2.2.5—Prokaryote cell structure conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 4]

Draw a labelled diagram of a prokaryotic cell.

cell wall - a uniformly thick wall;
pili - hair-like structures connected to cell wall / flagellum - at least length of the cell;
plasma/cell membrane $\left.-\quad \begin{array}{l}\text { represented by a continuous single } \\ \text { line; }\end{array}\right\} \begin{aligned} & \text { (may be labelled } \\ & \text { as the innermost } \\ & \text { wall line) }\end{aligned}$
ribosomes (70S) - drawn as small discrete dots;
naked DNA/nucleoid - region with DNA not enclosed in membrane;
plasmid - circular ring of DNA;
cytoplasm - the non-structural material within the cell;

Award [2 max] if any eukaryotic structure is shown.

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IB Biology HL A2.2.5 Prokaryote Cell Structure Questions question 1