When a protein is heated, it may unfold, losing its secondary, tertiary, and even quaternary structure. This process is known as .

When water freezes, it becomes less dense than in its liquid state, causing it to float.

An electrically charged molecule or atom such as Ca2+ is a(n) ________.

A substance that helps to maintain a stable pH is a(n) ________.

Molecules that are polar and attracted to water are ________; molecules that are nonpolar and therefore not attracted to water are hydrophobic.  

Which one of the following statements is TRUE regarding the structure of the atom? Select all that apply.

What type of bacterial shape is 1?

Goblet cells, which line the inside of the trachea (wind pipe), are critical for moving foreign substances away from the lungs and out of the body because they  

Which of the following pigments is most likely the yellow one extracted via chromatography?

Which one of the following lists the bones of the arm from the shoulder joint to the fingertips?