The ____ , located ____ of the transcription start point, is the site at which RNA polymerase associates with DNA to
begin transcription.
a. promoter; upstream
b. initiator; downstream
c. initiator; upstream
d. promoter; downstream
e. intron; downstream
ANSWER: a
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Identify the structure of the neuron marked D
a. axon terminal b. cell body c. axon d. glial cell e. dendrites
Why do some animal viruses have an external envelope, while bacteriophages never do?
A. When animal cells are lysed, part of the plasma membrane attaches to the virus; in bacterial cells, it is covered by the cell wall. B. Some animal viruses bud out, taking part of the plasma membrane with them, whereas phages always lyse the host bacterial cell when they exit. C. When phages bud out of the host bacterial cell, they take with them part of the cell wall which forms the capsid, not an envelope. D. When bacteriophages bud out, the plasma membrane is beneath the cell wall and therefore cannot be removed.
Repetitive noncoding DNA makes up approximately ___% of the human genome
a. 1 b. 10-15 c. 24 d. 50-55 e. 90-95
A key factor in the high prevalence of otitis media in children is
A) the maturing of the innate and adaptive immune responses in children. B) the lack of a mature microbiome in the auditory canal. C) children do not complete their routine vaccine schedule until adolescence. D) children are more likely to suffer from colds and influenza than adults. E) the orientation of the eustachian tube in children prevents efficient fluid drainage.