During a cough, what is responsible for constricting the size of the trachea?
A) closure of the soft palate
B) cartilage
C) smooth muscle
D) epiglottis
E) skeletal muscle
C
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Which statement is true of angiosperms?
a. All edible fruit are produced by eudicots. b. There are only two major groups of angiosperms. c. They all belong to the phylum Anthophyta. d. All angiosperms have a major tap root.
On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. Which type of reproductive isolation operates to keep the mosquitofish isolated, even when fish from different ponds are reunited in the same body of water?
A. mechanical isolation B. gametic isolation C. temporal isolation D. behavioral isolation E. habitat isolation
Conjugation between a bacterium that lacks an F factor (F?) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?
A) The F? bacterium ends up carrying one or more plasmids from the F+ bacterium; the F+ bacterium is unchanged. B) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with an unaltered chromosome. C) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with a chromosome that lacks those genes. D) The F? bacterium ends up with a recombinant chromosome that carries some genes from the F+ bacterium, and the F+ bacterium ends up with an unaltered chromosome.
Flagella is located on the _____ of bacteria cells. One flagella on a bacteria cell is known as _________.
Fill in the blank(s) with the appropriate word(s).