Which type of arboviral encephalitis was introduced to the United States in 1999 and is maintained in a bird-mosquito-bird cycle?
a) Eastern equine encephalitis
b) Japanese encephalitis
c) West Nile virus
d) California encephalitis
Ans: c) West Nile virus
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How does the Hebbian principle apply to synaptic connections?
a. Synaptic connections are weakened in neurons with multiple inputs. b. Synaptic connections are disabled by rapid activation. c. Synaptic connections are strengthened by repeated activation. d. Synaptic connections lead to cytoplasmic fusion between neurons.
HIV affects
a. the human reproductive system. b. the human circulatory system. c. the human respiratory system. d. the human immune system. e. the human digestive system
In humans, assume that the allele for brown eyes is dominant and the allele for blue eyes is recessive
If two brown-eyed individuals have a child with blue eyes, that means:a. both parents are homozygous for brown eyes. b. both parents are heterozygous for eye color. c. there is a 1/4 chance that their second child will have brown eyes. d. there is a 50/50 chance that their second child will have blue eyes. e. there is a 3/4 chance that their second child will have blue eyes
Cancer cells are different from other cells in that they have lost their "contact inhibition." Contact inhibition means:
A) most cells don't begin to divide until they bump up against other cells or collections of cells. B) DNA replication in most cells stops when the double helix comes in contact with particular enzymes. C) most cells stop dividing when they bump up against other cells or collections of cells. D) DNA replication in most cells doesn't begin until the double helix comes in contact with particular enzymes. E) most cells stop dividing when they have reached 50 cell divisions.