A pregnant woman comes into the hospital past her due date. The doctor decides it is time for the baby to be delivered. Before performing a cesarean section, the doctor wants to try to induce labor. Which of the following would she most likely inject?
A) estrogen
B) progesterone
C) luteinizing hormone (LH)
D) follicle-stimulating hormone (FSH)
E) oxytocin
Answer: E
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For most terrestrial ecosystems, pyramids composed of species abundances, biomass, and energy are similar in that they have a broad base and a narrow top. The primary reason for this pattern is that _____
A) secondary consumers and top carnivores require less energy than producers B) at each step, energy is lost from the system C) as matter passes through ecosystems, some of it is lost to the environment D) biomagnification of toxic materials limits the secondary consumers and top carnivores E) top carnivores and secondary consumers have a more general diet than primary producers
Diphtheria is a contagious disease that spreads from person to person mainly by the fecal-oral route.
Answer the following statement true (T) or false (F)
In biological nitrogen-fixation, ____
a. ammonia is converted to nitrogen gas b. nitrogen gas is converted to ammonia c. ammonia is converted to nitrate d. amino acids are linked into proteins in ribosomes e. nitrate is converted to ammonia
A random change in allele frequency over time that is brought about by chance alone is known as ____
a. genetic drift b. gene flow c. natural selection d. disruptive selection e. balanced polymorphism