Typically, acetylation of histone tails leads to __________
A) removal of the protein components of the chromatin from the DNA
B) relaxed packaging of the chromatin and increased transcription
C) tighter packaging of the chromatin and reduced transcription
D) increased amounts of euchromatin relative to heterochromatin
E) activation of topoisomerase
B
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In animal skeletal muscles, red muscle fibers
a. have an abundance of myoglobin. b. are mainly anaerobic. c. have few mitochondria. d. are good for short bursts of activity. e. more than one of these answers is true.
A mutation in the ruvB gene mostly likely will:
A. reduce resistance to UV light. B. increase binding of RuvA to DNA. C. increase binding of RuvB to DNA. D. stabilize the Holliday intermediate. E. increase recombination of DNA.
Genetic counseling to help patients with Huntington disease in their families decide if they wish to be tested
A) explains that testing for adult-onset dominant disorders is not available. B) takes one or two visits. C) takes several months. D) advises all such individuals not to have children.
Lakes become eutrophic by
A. free exchange of water with outside sources. B. loss of organic matter. C. an increase in the number of organisms. D. circulation of water in the lake. E. accumulation of organic matter.