Many birth-control pills give a constant amount of synthetic estradiols and progesterone for 21 days, and followed by seven days where no hormones are ingested. These constant hormone levels affect the menstrual cycle in different ways
Which of the following
statements most accurately describes the effects of birth control pills?
A. Birth control pills inhibit the formation of
uterine lining so implantation of a fertilized
oocyte cannot occur.
B. Birth control pills maintain constant levels
of certain hormones so there is no surge in
FSH and ovulation does not occur.
C. The seven days with no hormones does
not allow a thick enough uterine lining to form
so a fertilized oocyte cannot implant.
D. Birth control pills maintain constant levels
of certain hormones and mask the release of
the oocyte from the follicle.
B
You might also like to view...
Gehring tested the hypothesis that the Pax6 gene acts as a master regulator of eye development by engineering Drosophila Pax6 genes to be expressed in Drosophila antennae. What happened, and did it support or refute his hypothesis?
A. A compound eye developed on the antenna; this supports the hypothesis. B. A compound eye developed on the head; this supports the hypothesis. C. The antenna developed normally; this falsified the hypothesis. D. The antenna developed where the eye normally would be; this supports the hypothesis. E. The antenna developed where the eye would normally be; this falsified the hypothesis.
What structure helps mangroves with structural support and gas exchange?
a. Sediment traps b. Pneumatophores c. Mangal d. Chromatophores
Chromosomes are not visible in the nucleus unless the cell is undergoing nuclear division.
Answer the following statement true (T) or false (F)
Homo floresiensis is a relatively new find of fossils from:
A) Africa. B) Australia. C) Indonesia. D) Europe.