Dna is found in all the following cell structures except the a. nucleus. b. mitochondria. c. chloroplasts d. ribosomes.

DNA is found in all the following cell structures except the Ribosomes.

Option D

Explanation:

In the cell, organelles such as nucleus, mitochondria and chloroplast have their DNA. Organelles are film bound sub units inside a cell that is similar to organs in the body which performs explicit capacities. The nucleus is the control focus of the cell, and houses hereditary data.

The mitochondria are involved in respiration process and they are involved in production of ATP which acts as energy currency of the cell and chloroplasts also has its own genetic material due to it important function. So among the four options given in the question, ribosome lacks DNA.

"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."