In a(n) _____, atoms share an electron unequally
1.non-polar bond
2.ionic bond
3.polar covalent bond
4.covalent bond
3
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Both environmental conditions and nutrient resources strongly influence the composition of a microbial community
Indicate whether the statement is true or false.
A tunicate is in which phylum?
The free-swimming tunicate larva resembles a tadpole. Once it settles headfirst onto a solid surface the tail and notochord disappear, and the nerve cord shrinks to nearly nothing. The adults, which are usually sessile, retain only the pharyngeal slits. Neither adult nor larva is segmented. A. Annelids B. Nematodes C. Chordates D. Mollusks E. Echinoderms
Alpine pennycress plants remove zinc and cadmium
from the soil and store them away in their a. chloroplasts. b. amyloplasts. c. central vacuoles. d. Golgi bodies. e. vesicles.
The basic tool of genetic regulation is the ability of certain proteins to bind to specific
A. regulatory DNA sequences. B. promoter parts of the gene. C. enzymes of the cell. D. repressor parts of the gene. E. regulatory RNA sequences.