DNA replication is semi-conservative because O It is a polymer and therefore not a perfect replication
O It can only be made up of nucleotides
Othe resulting double helix is composed of both an old strand and a new strand.
O only certain nitrogenous bases can bond to one another

option 3

Explanation:

dna replication is semiconservative because it conserves half of the DNA molecule so the new double would contain an old strand that was conserved and a new strand

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.