Which ions are important for establishing the resting potential in neurons?
A. Na+
B. K+
C. Intracellular anions (e.g., proteins)
D. H+
E. All of the choices other than H+ are correct
E. All of the choices other than H+ are correct
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You have discovered a new bacterial strain that causes urinary tract infections. Closely related bacterial species cannot cause infections. You compare the strains and find that your new strain has structures composed of protein external to its cell wall
What structures might your new strain have that the other strains do not? Why? What will be an ideal response?
What endogenous process helps plants to keep their movements and other responses synchronized with the environment?
A. purine monitoring B. solar tracking C. a circadian clock D. auxin cycling E. gravitropism
An animal has segments, bilateral symmetry, pharyngeal slits, a post-anal tail, and a notochord. It must be a member of the phylum _____.
Fill in the blank(s) with the appropriate word(s).
A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleus. B. cell. C. plasma membrane. D. nucleolus.