A nerve cell returns to the resting potential as ______ ions leave the cell
a. sodium
b. potassium
c. calcium
d. chloride
e. ammonium
B; The diffusion of potassium during the second part of the action potential takes place as potassium leaves the cell. The loss of positively charged ions helps to reestablish the resting potential, which is negative inside relative to outside the cell.
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____ are multicelled projections that protrude
from the lining of the small intestine.
a. Sphincters b. Brush borders c. Microvilli d. Villi e. Macrovilli
Pseudodominance is used to map genes by using what method?
What will be an ideal response?
To prepare for a hiking trip in the Appalachian mountains you buy several field guides for the region from a used bookstore. You notice that the older guides list a single species of tiger swallowtail butterfly Papilio glaucus and an Appalachian morph of this species. However the newest guide list two separate species P. glaucus and P. appalachiensis. The authors of this guide state that the biological species concept was used in determining their classifications. What do you think led them to list two separate species of tiger swallowtail?
A. The discovery that P. glaucus and P. appalachiensis have distinct differences in wing coloration. B. The discovery that P. glaucus and P. appalachiensis interbreed in the wild. C. The discovery that P. glaucus and P. appalachiensis feed on different host plants. D. The discovery that P. glaucus and P. appalachiensis do not interbreed in the wild. E. The discovery that P. glaucus and P. appalachiensis have a genomic similarity of 99%.
When oxygen is present in the environment, methylene blue is ______.
A) blue B) colorless