The stimulus for secretion of neurotransmitters into the synaptic cleft is an increase in
A) potassium levels.
B) chloride levels.
C) sodium levels.
D) calcium levels.
E) neurotransmitter levels.
D) calcium levels.
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Lions are heterotrophic carnivores living on the African savannah. They live in prides with
several females and a dominant male. Mating occurs in the summer. This describes the organism’s __________.
a. habitat b. niche c. food web d. carrying capacity
The polynucleotide chain of DNA has polarity: the 5¢ end has a bound ____, while the 3¢ end has a bound ____
a. deoxyribose sugar, ribose sugar b. adenine, thymine c. cytosine, guanine d. hydroxyl group, phosphate group e. phosphate group, hydroxyl group
If you are exposed to ancient Peruvian art for the first time and experience some difficulty trying to figure out the meaning and quality of the art, you would be forced to simply examine the specific elements of the art since you do not have any background cultural information to use as a context in understanding the art. This would be an example of
a. bottom-up processing.
b. top-down processing.
c. left-right processing.
d. right-left processing
Which of the following is not involved in achieving and maintaining an erection?
A. nitrous oxide B. blood C. smooth muscle D. urethra E. cGMP