Which of the following structures is NOT one of the extraembryonic membranes associated with the human embryo?
A. amnion
B. yolk sac
C. allantois
D. placenta
E. chorion
Answer: D
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In a study of tadpole coloration, you noticed that a certain percentage of tadpoles in a population displayed a decreased ability to shift from dark coloration at night to light coloration during the day
These individuals were studied and found to have the normal number of melanophores that produced normal amounts of melanin pigment granules. You remember reading about melanophores and pigment granule transport in cells and that it involved the cytoskeleton. Which part of the cytoskeleton would you suggest investigating as a potential source of the faulty color adjustment in these tadpoles? A. intermediate filaments B. microtubules C. microfilaments
What are estuaries?
A) types of freshwater biomes B) areas near the start of a river C) regions where ocean meets land D) transition areas between a river and the ocean
Which factor contributes to plaque formation in coronary arteries?
A) fat cells clogging the interior B) inflammation of the lining where LDLs have attached C) protein deposits in the interior D) inflammation of the lining where HDLs have attached
Which structure regulates the passage of food from the stomach into the small intestine?
A) the pharynx B) the epiglottis C) the pyloric sphincter D) the stomach submucosa