Menstruation does not occur if the
a. uterine lining thickens.
b. estrogen level falls.
c. progesterone level falls.
d. egg is fertilized.

Which of the following will a bacterium produce when a human gene is added to its genome? question 4 options: human carbohydrates a protein made up of both human and bacterial properties the human protein coded for by the human gene human plasmids that can be isolated from the bacterium