______________________ is the exchange of oxygen and carbon dioxide between blood in systemic capillaries and tissue cells.

In the absence of geographic barriers, ________ speciation may occur when reproductive isolating mechanisms develop between two populations.

The wings of birds and insects share similar functions but evolved from different structures; therefore, these wings are said to be

Identify the STRUCTURE (not the cells) indicated by the arrow.   

The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal. After the system reaches equilibrium, what changes are observed?

You want to know how much protein you have in your solution, and you have a spectrophotometer.  You think there is 5 mg of protein. How can you determine the protein concentration? 

The final step in a Sanger DNA sequencing reaction is to run the DNA fragments on a gel. What purpose does this serve?

Answer the questions in numerical order [40] [41]

A service dog is easily identified by its:

Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid. The frogs are identical in appearance, but their mating calls, which females use to find mates, differ. Which difference most likely evolved first?