Which type of receptor is used by a ratto detect pheromones from a potential mate?
a. mechanoreceptors
b. photoreceptors
c. chemoreceptors
d. thermoreceptors
e. nociceptors
ANSWER: c
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Select the diseases caused by trypanosomes.
A. Leishmaniasis B. Giardiasis C. Trichomoniasis D. African Sleeping Sickness E. Chagas Disease
The SA node, also known as the __________ spontaneously generates the action potentials that set the pace for
cardiac contractions. Fill in the blank(s) with the appropriate word(s).
RNA is a multifaceted molecule and key component to the success of life. Which of the following statements about RNA is most accurate?
a. RNA is incapable of storing information, but it is vital in converting the information embedded in DNA to useful proteins. b. The world was most likely filled with DNA-life first, which evolved to produce RNA-life. c. There is no link between RNA and the possibility of it being a precursor to cellular life. d. It is possible that this complex molecule could have been a self-replicating system. e. RNA is an enzyme.
A cocklebur is dispersed by ________, whereas most fleshy, edible fruits are eaten by animals that ________
A) wind; fully digest the fruits, including the seeds, which are killed B) water currents; defecate the intact seeds C) hitching rides on animals; fully digest the fruits, including the seeds, which are killed D) hitching rides on animals; defecate the intact seeds