Humans, as well as all other mammals, have hair. Hair, then, would be considered to be a(n):
a. derived character.
b. cladistic character.
c. ancestral character.
d. analogous character.
e. polyphyletic character.
c
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Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic B. Homeotic, Gap, Bicoid C. Homeotic, Bicoid , Gap D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order. E. Kruppel, gooseberry, even-skipped
Which of the following is not a virulence factor of Bordetella pertussis?
A. M protein B. Tracheal cytotoxin C. Pertussis toxin D. Filamentous hemagglutinin E. Endotoxin
Below is a diagram of a bacterium. What structure does Y represent?
a. capsule b. nucleoid c. flagella d. cell wall e. fimbriae
HEPA filters are able to filter many airborne viruses
a. true b. false