Which groups of commercially grown plants are produced by tissue culture propagation?
a. Pine trees
b. Orchid
c. Grape vines
d. Grasses
e. Rose bushes
b
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Which type of nosocomial infection is the most common?
A) skin infection B) intestinal infection C) blood infection D) urinary tract infection
A scientist wants to examine living cells lining the respiratory tract to determine how the cells use tiny hairs to move dirt and mucus away from the lungs. Which of the following instruments would be best, and why?
A) a light microscope, because it allows observations of whole, live cells B) a transmission electron microscope, because it has high resolution C) a scanning electron microscope, because it can reveal structures on cell surfaces D) a scanning electron microscope, because it can be used to observe whole cells without slicing them
What percentage of carbon dioxide carried in blood is dissolved in plasma?
A. 0% B. 7% C. 5% D. 1% E. 10%
When a species consisting of a single large population slowly evolves over many generations into a new species, this an example of
A. synapomorphy. B. horizontal gene transfer. C. cladogenesis. D. anagenesis. E. monospeciation.