Tropomyosin is a protein found in both skeletal and smooth muscle, but the mRNA produced in each of these is different in composition even though they are transcribed from the same gene. This observation is explained by a mechanism in eukaryotic cells known as .

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Building glycogen from glucose molecules is an example of what