In a negative feedback regulation process:

NaCl is an example of a(n) ______ compound, because one atom loses an electron, and the other one gains it.

The concentration of a substance refers to the amount present in a particular:

Anabolic reactions require energy _______ and are classified as ___________.

Select each of the following that is true about water:

Which term describes the smallest particle of a covalently-bonded compound that still has the properties of that compound?

Select each of these that is classified as an organic compound:

Ca is the chemical symbol for ______________.

Different enzymes catalyze different chemical reactions and are needed for both synthesis and decomposition.

An enzyme called lactase binds the disaccharide lactose and breaks it apart into two monosaccharides: glucose and galactose.  What is/are the substrate(s) of lactase?