One function of the developing follicle is to ____
a. stimulate ovulation
b. secrete progesterone
c. secrete estrogens
d. secrete gonadotropin-releasing hormone (GnRH)
e. secrete glycoproteins, which promote sperm motility
ANSWER: c
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Because of the complexity of the Schistosoma life cycle, there are several parts of the cycle that could be disrupted to halt the spread of the disease. Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?
A. Install sanitary sewage treatment facilities to prevent the dispersal of eggs present in urine and feces. B. Apply chemical molluscicides (chemicals targeted to molluscs like snails) to bodies of fresh water. C. Identify a surface protein on Schistosoma miracidia that the immune system can recognize and create a vaccine using that antigen. D. Monitor water bodies to detect the presence of infectious miracidia and enforce no bathing rules when they are present.
The protein that progressively unwinds DNA ahead of each replication fork is called
A) primase. B) helicase. C) topoisomerase. D) telomerase. E) ligase.
What two organelles are both responsible for converting energy into forms that can be used by cells?
a. ribosomes and chloroplasts b. lysosomes and chloroplasts c. mitochondria and lysosomes d. mitochondria and peroxisomes e. mitochondria and chloroplasts
If the prostate gland failed to add its enzyme-rich fluid to semen, the
A) semen would exhibit reduced fluidity, hampering the ability of sperm to swim freely in the vagina. B) sperm would starve from lack of fructose. C) egg would be killed by the acidic vaginal secretions. D) semen would lack lubricating mucus. E) acrosome would rupture prematurely.