_____ are densely staining, highly compacted, and transcriptionally inactive regions of chromatin
a. Homochromatin
b. Heterochromatin
c. Histone-dependent chromatin
d. Primary chromatin
e. Euchromatin
b
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In addition to S. aureus, impetigo may also involve
A. M. luteus. B. S. pyogenes. C. S. epidermidis. D. Pseudomonas spp.
Embryonic stem cells derived from blastocysts are called pluripotent because they ________
A. are viable under a wide range of laboratory conditions B. can form most cells, tissues, and organs of the human body C. can form all cells, tissues, and organs of the human body D. are viable under a wide range of laboratory conditions and can form most cells, tissues, and organs of the human body E. are viable under a wide range of laboratory conditions and can form all cells, tissues, and organs of the human body
The most common form of spontaneous replication error is
A) tautomeric shift. B) double-stranded DNA breaks. C) thymine dimer addition. D) base analogue addition. E) DNA intercalation.
Which statement best describes the value of fungi in the environment?
A. Fungi “fix” nitrogen from the air for use by plants. B. Fungi trap sunlight energy in the form of carbohydrates. C. Fungi release nutrients from organic matter. D. Fungi enrich the soil by decreasing the rate of decay of organic matter. E. Fungi remove toxic metals from the soil.