Closure of the Na+ channel inactivation gate is responsible for the ______ refractory period.
Fill in the blank(s) with the appropriate word(s).
Answer: absolute
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Which of the following is true about attenuated vaccines?
a. They run a high risk of causing a full-blown case of the disease. b. One vaccine can prevent a multitude of infectious diseases. c. They lead to better and longer-lasting immunity. d. They lead to less-effective and shorter immunity.
Based on Figure 42-1, the __________ is much more developed in amphibians than in reptiles
a. cerebellum
b. cerebrum
c. optic lobe
d. olfactory tract
e. corpus striatum
___ are a type of internal signal molecule used in controlling the cell cycle.
Fill in the blank(s) with the appropriate word(s).
Integral proteins with carbohydrates (sugars) attached that stick out on the exterior surface of cello membranes help recognize "self" and are called ______________.
a) amino acids b) lipoproteins c) glycoproteins d) monosccharides