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

The structure of a cell membrane includes a modified form of lipid called [phospholipid] bilayers.

What is the source of all genetic variation?

A solution of pH 5 is more acidic than a solution of pH 3.

Which one of the following is the study of matter and the energy that causes matter to combine, break apart, and recombine in everything living and nonliving? *Please watch the following video to review for this question and more to come.

A mad scientist has ripped apart an atom and collected all the subatomic particles located in the atom’s nucleus. Which one of the following has he collected?

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

The process by which cells break down organic macromolecules into their subunits by adding water molecules is called [hydrolysis].

The oxygen atom shares its two electrons with the hydrogen to form H2O through a [covalent] bond, like they are having a potluck party.  On the other hand, table salt NaCl is formed through an [ionic] bond where sodium gives one of its electrons to the chloride, like it never gets it back. 

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