The sequence of three nitrogen bases in dna or mrna that codes of an amino acid is called a

Codon

Explanation:

The sequence of the bases along the DNA strands act as a code which determines the sequence of amino acids to be linked to form a specific protein. Every set of three bases along the DNA strands is responsible for bringing into position a particular amino acid of a polypeptide chain. The set of a base triplet is called a codon and it codes for a particular amino acid of protein molecule. Example of such codon are AAA coding for amino acid lysine.

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"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."