What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have tropchophore larvae.
B. They all shed their exoskeletons.
C. They all have radial cleavage.
D. They all have lophophores.
E. All of the choices provided are correct.
B. They all shed their exoskeletons.
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Bioluminescence is:
A. the production and emission of light by organisms B. the capture of moonlight for nocturnal photosynthesis C. the absorption of light by pigments for transfer to chlorophyll a D. the ability to detect and move away from sources of light E. the ability to detect and move toward sources of light
Genetic drift affects
a. allelic frequencies only b. genotypic frequencies only c. phenotypic frequencies only d. allelic, genotypic, and phenotypic frequencies
Molecules are composed of two or more ____________________ chemically ____________________ together. Fill in the blank(s) with the appropriate word(s)
The diameter of an intermediate filament is 25 nm.
a. true b. false