Chapter 2

A(n)________ is a molecule into which a radioisotope has been incorporated.

A(n) ________ forms when atoms of two or more elements bond covalently.

Atoms share electrons unequally in a(n) ________ bond.

Hydrogen ions \((H^+\)) are ________ . a. indicated by pH b. protons c. in blood d. all of the above

When dissolved in water, a(n) ________ donates \(\mathrm{H}^{+}\).

\(A(n)\) ________ is a chemical partnership between a weak acid or base and its salt.

Each carbon atom can share pairs of electrons with up to ________ other atom(s).

________ is a simple sugar (a monosaccharide). a. Glucose b. Sucrose c. Ribose d. Starch e. a and \(c\) f. \(a, b,\) and \(c\)

Unlike saturated fats, the fatty acid tails of unsaturated fats incorporate one or more ________ .

Is this statement true or false? Unlike saturated fats, all of the unsaturated fats are beneficial to health because their fatty acid tails do not pack tightly together.

Which of the following is a class of molecules that encompasses all of the other molecules listed? a. triglycerides b. fatty acids c. waxes d. steroids e. lipids f. phospholipids

________ are to proteins as________ are to nucleic acids. a. Sugars; lipids b. Sugars; proteins c. Amino acids; hydrogen bonds d. Amino acids; nucleotides

A denatured protein has lost its________ . a. hydrogen bonds b. shape c. function d. all of the above

________ consist(s) of nucleotides. a. sugars b. DNA c. RNA d. b and \(c\)

Match each molecule with its most suitable description. ________chain of amino acids ________energy carrier in cells ________glycerol, fatty acids, phosphate ________two strands of nucleotides ________one or more sugar monomers ________richest source of energy ________hydrophilic ________number of protons in nucleus a. polar b. phospholipid c. temperature d. DNA e. ATP f. triglycerides \(g\). atomic number h. carbohydrate i. polypeptide molecular jiggling