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

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?

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?

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

Answer the questions in numerical order

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?

What is the most logical sequence of steps for splicing foreign DNA into a plasmid and inserting the plasmid into a bacterium? Transform bacteria with a recombinant DNA molecule. Cut the plasmid DNA using restriction enzymes (endonucleases). Extract plasmid DNA from bacterial cells. Hydrogen-bond the plasmid DNA to nonplasmid DNA fragments. Use ligase to seal plasmid DNA to nonplasmid DNA.

Which of these is aspergillus