Which of the following serves to end the menstrual
cycle?
a. a surge in luteinizing hormone
b. the secretion of human chorionic gonadotropin
c. the breakdown of the corpus luteum
d. a rise in the level of progesterone
e. a drop in the level of gonadotropic hormones in
the blood
Answer: c
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Which of the following points on the phylogeny shown above depicts the most recent common ancestor of Animals and Microsporidians?
A. 1 B. 2 C. 3 D. 4 E. 5
Contraction of the diaphragm ____.
A. diminishes the volume of the thoracic cavity B. increases the volume of the thoracic cavity C. pushes the rib cage downward D. causes external intercostal muscles to relax E. decreases lung capacity
Which of the following karyotypes would lead to male characteristics in humans?
A) XXY B) XYY C) XO D) XO and XYY E) XXY and XYY
Because of the existence of (acute/asymptomatic/passive) carriers, the eradication of meningococcal disease is unlikely.
Fill in the blank(s) with the appropriate word(s).