When a medication is added to a regimen for a synergistic effect, the combined effect of the drugs is

When is the second quiz due?

Based on this information:   Which of the structures below is not possible?      

Sulfur is in the same column of the periodic table as oxygen, but has low electronegativity.  Compared to water molecules, molecules of H2S will have:

 A polar covalent bond results from _________________________________.

   This image shows a fatty acid. This is an example of a(n) ___________________ fatty acid and a fat comprised of only this type of molecule is expected to be _____________ at room temperature  

E. coli bacteria have been shown to have the ability to respond to various factors in their environment.  In one study, these bacteria were shown to move away from toxic chemicals in the environment.  This is an example of _______________________.

You are collecting biological samples and bringing them back to the lab to determine the diversity of organisms present in the sample. Most of the species are already described, but you find one that you think is a new species. It is a prokaryote. Which of the following would you find if it is a member of the Archaea, not a bacteria?

You are looking at a collection of cells from a newly discovered diploid organism.  You determine that a cell in the G1 phase contains 22 picograms of DNA.  You find another cell that has 44 picograms of DNA.  What can you definitively conclude about the cell with 44 picograms of DNA?

Which of the following best illustrates the process of natural selection?