Mutation rates per nucleotide per replication:
- are higher in organisms with larger genomes
- are highest in viruses.
- are lower in organisms with larger genomes.
- are similar across all organisms.
- are highest in bacteria.

The correct answer will be option-are highest in viruses.

Explanation:

The mutation is a change or alteration in the nucleotides of a DNA which is the coding molecule of the organisms. Mutations are known as the building blocks of the evolution which introduces variation upon which the natural selection act.

The mutation takes place in every organism on earth but the highest rate of mutation per nucleotide is observed in the RNA viruses which are involved with the adaptability and virulence. The mutation rate is million times higher than their hosts and a small increase in the mutation rate can make them extinct.

Thus, the selected option is the correct answer.

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.