Exam 2: A: The Chemical Basis of Life

Dalton named the atom after the Greek word for invisible.

A substance that releases an OH- ion in solution is called a base.

The body uses the steroid cholesterol to make hormones.

Four elements are considered to be the major elements in the body.

Electrons surround the nucleus of an atom in areas of probability rather than in defined orbits.

pH is the negative logarithm of the hydrogen ion concentration.

One of the functions of water in the body is that of helping to maintain a constant body temperature.

Fifty percent or more of a normal adult's body weight is water.

Both triglycerides and prostaglandins can contain unsaturated fat.

The positively charged electrons are found in clouds outside the nucleus of an atom.

The "aliveness" of a living organism depends on the mixture of elements of which it is made.

One function of carbon dioxide is to help maintain proper pH balance in the body.

ATP is broken down in an anabolic reaction.

The chemical reaction of an acid with a base will produce a salt and water.

DNA molecules are the largest molecules in the body.

A denatured protein has lost its functional shape.

Nucleotides are used to make only RNA or DNA molecules.

The nonessential amino acids cannot be produced from the other amino acids or from simple organic molecules.

Proteins are the most abundant of the carbon-containing compounds in the body.

An ionic bond forms crystals whereas a covalent bond forms molecules.