Dna is made up of pairs of nitrogenous bases. which of the following nitrogenous bases is paired correctly?

im pretty sure that the answer is C. Thymine-adenine

The correct answer will be option-C.

Explanation:

DNA is made up of nucleotides which are composed of the five-carbon sugar deoxyribose, a phosphate group and four types of the nitrogenous base.

The nitrogenous base remains perpendicular to the backbone made of the sugar and phosphate. The bases bonds to each other following a rule suggested by the Chargaff.

Chargaff rule stated that purine will bind complementary pyrimidines like adenine will bind thymine and guanine will bind cytosine. Thus, Option-C 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.