Which best describes the first step in genetic engineering? Fragments of DNA that have desired genes are isolated to form recombinant DNA for use in a host.
All the DNA from a desired organism is isolated to form recombinant DNA for use in a host.

Fragments of DNA that have desired genes are isolated to form recombinant DNA for use in a host.

Explanation:

The first step in the genetics therapy it is to isolate the gene of interest. You can see this procedement in the image below.

The Cas9 of the image is the CRISPR associated with the protein 9. CRISPR is a bacteria's enzym which can edited portions of ADN.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

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.