Which of the following statements regarding blood vessel structure is NOT true?
a) walls of arteries and veins contain 3 layers or tunics
b) veins typically have thinner walls
c) capillaries contain valves
d) the tunica media is the thickest layer in arterial walls
Answer: c) capillaries contain valves
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In a Giesma-stained karyotype, each chromosome can be identified by its unique pattern of:
A. supercoils. B. spirals. C. bands. D. coloration. E. None of the answer options is correct.
The most dangerous outcome of a Taenia solium infection occurs when
A. larvae cross the placenta. B. eggs are ingested. C. larvae enter the body through intact skin. D. cysticerci are ingested. E. the host immune system fails to react against it.
What happens when the arrector pili muscles contract?
A. The hairs on your skin stand on end. B. The blood from your skin is rerouted to your core. C. Your leg kicks out. D. You tap your finger. E. Your head nods "yes."
The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids B. methane gas and alcohols C. carbohydrates D. inorganic compounds