Use the information shown in the diagram to suggest the order of events that occurs when light is shone on the bacterium from the direction indicated.
State the benefit to the bacterium of reacting to light in this manner.
There are similarities between the roles of parts of the bacterium and the roles of structures in the human eye. Suggest which structure in the human eye has a function similar to each of the following regions of the bacterium: A; B.
The bacterium shown in the diagram carries out nitrogen fixation. Describe the role of bacteria in nitrogen fixation.
The enzyme used by these bacteria to fix nitrogen is destroyed when oxygen is present. Suggest why destruction of this enzyme is likely to happen in the type of bacterium shown in the diagram.
Suggest one adaptation that such bacteria may have evolved to stop this enzyme from being destroyed.