Focusing on an object requires the interaction
of the ___ and the ___.
a. ciliary muscles--lens
b. ciliary muscles--cornea
c. ciliary muscles--iris
d. iris--pupil
e. cornea--pupil
A
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Which feature(s) differentiate(s) Actinobacteria from Firmicutes?
A) absence/presence of a cell wall B) endospore production capability C) motility and chemotaxis abilities D) relative G+C content in their genomes
Which environmental condition is least likely to select for an iteroparous life-history strategy?
A. High adult survival rates B. very long life spans C. low rates of population increase D. early reproduction E. young that require parental care
In cells infected with simian sarcoma virus, the sis oncogene causes the cells to release increased amounts of Sis protein, which is recognized by PDGF-receptor molecules on the cells' own surface. This type of signaling loop is an example of
a) Endocrine signaling. b) Paracrine signaling. c) Autocrine signaling. d) Trans-receptor signaling.
Which of these is an ecosystem?
A. lakes B. all of the fish in Lake Erie C. Lake Erie and everything living in it D. the producers found in Lake Erie