Nitrogen fertilizers are used by plants to synthesize amino acids. State one reason why a supply of amino acids is important for the survival of complex organisms such as plants.
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An experiment was carried out to determine the effect of exposure to ultraviolet (UV)
light on the growth of bacteria. Equal quantities of bacterial cells were spread on Petri
dishes that are used to grow colonies of bacteria. Half of each dish was shielded from the
UV light with a UV screen. The other half was exposed to UV light for various amounts of
time. After the UV treatment, the bacteria were grown in an incubator for 24 hours and the
number of colonies was counted.
The diagram below represents the setup of the experiment.
Explanation:
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