In the central nervous systems, axons of several neurons traveling together are called ____
a. nuclei
b. fibers
c. bundles
d. tracts
e. filaments
ANSWER: d
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__________ is a measure of an atom’s ability to pull
electrons from other atoms. Fill in the blank(s) with the appropriate word(s).
Gene therapy has not yet cured any patients of their genetic disorder. Indicate whether the statement is true or false
How do group A streptococci camouflage themselves from white blood cells?
A) They produce coagulase, allowing the bacteria to hide within blood clots. B) They grow in chains or pairs. C) They produce streptokinase, which breaks down blood clots. D) They have hyaluronic acid capsules. E) They have a coating of protein M.
Which of the following might decrease the transcription of only one specific gene in a bacterial cell?
(a) a decrease in the amount of sigma factor (b) a decrease in the amount of RNA polymerase (c) a mutation that introduced a stop codon into the DNA that precedes the gene's coding sequence (d) a mutation that introduced extensive sequence changes into the DNA that precedes the gene's transcription start site