This animal has two atria and one ventricle and two vascular circuits. This animal is a(n) ____
a. salmon
b. woodpecker
c. alligator
d. rat
e. frog
ANSWER: e
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Why can sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen. b. The malformed red blood cells cannot enter capillaries and, in fact, block them. c. The malformed blood cells assume a sickle-shape. d. The patient has two copies of the mutant gene. e. More cells assume the sickle shape as oxygen concentration in the tissues falls.
Four of the five choices listed below are related by
the quantity of chromosomes present. Select the exception. a. spores b. sporophyte c. egg d. sperm e. gametophyte
For a given body size, the home range of carnivores is greater than that of herbivores
Indicate whether the statement is true or false
Which of the following is the best definition of a virion?
a. An infective virus inside of a host b. An infective virus outside of a host c. An inert virus inside of a host d. An inert virus outside of a host e. A virus which has infected a bacteria