_____ are hot spots for the evolution of antibiotic-resistant bacteria and their spread to humans due to excessive use of
antibiotics.
a. Hospitals
b. Laboratories
c. Farms
d. Doctor’s offices
e. Landfills
ANSWER: c
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Which atomic particle has no charge and is located in the nucleus?
A. proton B. electron C. neutron D. ion E. isotope
In the experiment by Davis et al., only fibroblast cells that took up the cloned myoD gene differentiated into muscle cells. This is because
A. only those cells contained muscle-cell-specific enhancer sequences. B. MyoD is a transcription factor that turned on muscle-specific genes such as myosin C. MyoD is a transcription factor that shut off fibroblast specific genes, allowing the muscle cell characteristics to show up D. MyoA and MyoH are transcription factors that shut off muscle-specific genes E. myoD is the gene for myosin and the presence of myosin converts the fibroblast into a muscle cell
This type of hormone characteristically requires a second messenger
A) lipid-soluble B) steroid C) water-soluble D) prostaglandin
The glycocalyx of a eukaryotic cell performs all of the following functions EXCEPT
A) protection against dehydration. B) anchoring cells to each other. C) cellular recognition and communication. D) transfer of genetic material between cells. E) strengthening the cell surface.