During menstruation, cells in the uterine lining secrete ____, which initiates contractions of the uterus.

A. prostaglandins
B. the corpus luteum
C. estrogen
D. progesterone
E. follicle-stimulating hormone


Answer: A

Biology & Microbiology

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Vascular plants store most carbohydrate reserves as:

A. glycogen. B. starch. C. sucrose. D. glucose. E. lipids.

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The technique that can be used to record ion currents passing through individual channels is known as

A) voltage-gating. B) ligand-gating. C) patch-clamping. D) ion sensors. E) optogenetics.

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Complete ____ reduces competition among insects within the same species; larval forms do not compete with adults

for food or habitats. a. mobilization b. reproductions c. differentiation d. morphogenisis e. metamorphosis

Biology & Microbiology

Which of the following is the best definition of "microbial antagonism"?

A. the presence of pathogens on the surface of the skin, which will invade the body through abrasions B. the presence of normal microbiota that protect the body by competing with pathogens in a variety of ways to prevent pathogens from invading the body C. the presence of normal microbiota that can become pathogens under certain conditions D. the ability of microbiota to mutate into pathogens E. the presence of resident bacteria on the surface of the body and in cavities that connect to the surface

Biology & Microbiology