Hemoglobin (see image) is a protein complex found within red blood cells for carrying oxygen molecules. The hemoglobin complex is made of 2 alpha globin polypeptide chains and 2 beta globin polypeptide chains. The entire protein complex described is hemoglobin’s ______ structure.

Which characteristic is NOT found in all nonliving entities? For the sake of argument, ignore viruses.

The bond in table salt (NaCl) is ____.

A large sample size assures the researcher that if there are differences between an experimental and control group, they will be more likely to be statistically significant. 

In living cells, complex metabolic reactions proceed in a series of steps called

Match each of the following.  Each answer is used only once.

Living things

Which tube shows the most catalase activity?

The light dependent reactions do not produce ____.

For animals, the final electron acceptor in cellular respiration is ____.