The ____________ membrane covers organs and does not open to the exterior of the body.  

Which has more sugar:

An alpha-helix within a polypeptide is an example of:

Which level of organization is the largest (or highest)?

Which is NOT one of the four main tissue types:

The thymus is part of which organ system?

Attraction between two polar molecules constitutes:

__________ fibers have the highest tensile strength. 

Using a Na+-gradient (which is produced by an ATP-powered Na+ pump) to drive movement of other solutes (e.g., glucose) constitutes:

Synthesizing an amino acid polymer from an mRNA polymer is called: