When would a point mutation occur?

point mutation, change within a gene in which one base pair in the DNA sequence is altered. Point mutations are frequently the result of mistakes made during DNA replication, although modification of DNA, such as through exposure to X-rays or to ultraviolet radiation, also can induce point mutations.

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Mutation occurs at random points in the bases of the DNA. Mutation happens during DNA replication either induced by environmental factors or through errors in mitosis and meiosis.

Explanation:

Point mutation is a change of one base pair in the DNA sequence. It is a result of a mistake during DNA replication. Causes of point mutation are either spontaneous mutation or exposure to radiation. It is usually not fatal. There are three types of point mutations: nonsense (mutation to premature stop codon), missense (mutation codes for a different amino acid), and silent (mutation codes for the same amino acid).

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.