Explain how the backbone of DNA is constructed from nucleotide building blocks. A. DNA's backbone is not constructed from nucleotide units.

B. Nucleotide building blocks use covalent bonds to attach to one another at their sugar and phosphate ends.

C. Nucleotides use hydrogen bonds to attach themselves to the backbone.

D. Nitrogen bases use hydrogen bonds to attach to one another across the center of the molecule.

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B

Explanation:

"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."