CREB is a stretch of DNA.
a. true
b. false
Answer: b. false
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When a neuron is at rest
a. the sodium and potassium gated channels are closed. b. the sodium gated channels are closed and the potassium gated channels are open. c. the sodium gated channels are open and the potassium gated channels are closed. d. the sodium and potassium gated channels are open. e. the sodium and potassium gated channels may be open or closed depending upon their location in the nervous system
The cell-mediated immune response is most effective against ____
a. cancer cells only
b. viral infected cells only c. bacteria circulating in the blood d. both cancer cells and viral infected cells e. normal flora
In a cephalized invertebrate, the system that transmits "efferent" impulses from the anterior ganglion to distal segments is the _____
A) central nervous system B) peripheral nervous system C) autonomic nervous system D) parasympathetic nervous system
As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which of the following characteristics would support your hypothesis that the animal is a sea star and not another type of echinoderm?
A) It is pentaradially symmetric. B) It feeds on other animals. C) It has a hydrostatic skeleton, formed from its water vascular system. D) Its central region is not well-delineated from its appendages.