The influenza viruses that infect man usually are derived from a type that could also infect:
a. Horses and sheep
b. Cattle and water buffalo
c. Chimpanzees and gorillas
d. Birds and pigs
e. A variety of primates
d. Birds and pigs
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The study of hantaviruses requires biosafety level (BSL) 4 precautions
Indicate whether the statement is true or false.
In a phylogenetic tree, a node or branching point represents:
A. the common ancestor from which the descendent species diverged. B. the species in the fossil record from which the descendent species diverged. C. one of the descendent species in the phylogeny. D. the ancestral species from which all species in the phylogeny arose. E. A node could be any of these, depending on the nature of the phylogenetic tree.
Which term refers to a fruit that develops from a single ovary in a single flower?
a. simple fruit b. accessory fruit c. multiple fruit d. aggregate fruit
Tomatoes that are planted upside down still grow upright, displaying
A) phototropism. B) lumitropism. C) gravitropism. D) amylotropism. E) thigmotropism.