Exam 2: The Chemistry of Living Things

One of the most important buffer pairs in blood is carbonic acid and bicarbonate because they regulate the pH of blood by absorbing and releasing hydrogen ions as needed.

Alpha helices and beta sheets are characteristic of protein

Which one of the following forms a bilayer structure that is found in cell membranes?

________ is the capacity to do work, the capacity to cause some change in matter.

The most important physical characteristic of lipids with regard to living organisms is that they

The acidity or alkalinity of a solution can be measured in terms of ________.

A solution with a pH of 6 has ________ times as many hydrogen ions as a solution with a pH of 8.

-The figure above shows a triglyceride that contains unsaturated fatty acids.

The process by which cells break down organic macromolecules into their subunits is ________.

Ions in body fluids of a human are referred to as

Which one of the following is TRUE regarding macromolecules?

Atoms with either more or fewer neutrons than the usual number for an element are referred to as isotopes.

Which one of the following is a molecule?

Carbohydrates have which one of the following characteristics?

Which one of the following characteristics applies to both living organisms and nonliving things?

Proteins that function as a catalyst

A polypeptide is generally referred to as a(n) ________ if it has more than 100 amino acids and has folded into a complex structure with a specific function.

-The type of bond indicated by the dotted lines in the figure above is a hydrogen bond.

Which solution has more free hydrogen ions: pH = 9 or pH = 3?

During intense exercise, you produce a lot of heat energy, yet your body temperature rises only in small increments. This temperature stability is because water in body fluids releases the heat very quickly.