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To which of the three domains of life do we belong? 

Choose the best description for each term. 

Human resistance to a given viral infection may be the result of ___.   

The resistance to reinfection by the measles virus following a measles infection is an example of ____.   

Exotoxins are harmful proteins secreted by bacteria.   

Chemical reactions can create matter. 

In DNA, which nitrogenous base pairs with guanine? 

DNA makes RNA.  RNA makes protein.  This process is called ______________. 

The overall three-dimensional shape of a polypeptide is called the _______________ structure. 

A group of cells performing a specific function is an example of the ___________ level of biological organization.