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1The amount of matter in an object is referred to as its
A)weight.
B)mass.
C)atomic number.
D)atomic mass.


2Which of the following does not contribute to the majority of an animal's weight?
A)oxygen
B)carbon
C)hydrogen
D)sodium


3The atomic mass of an element is equal to the number of __________ and _________ in the nucleus of one of its atoms.
A)neutrons and protons
B)protons and electrons
C)electrons and neutrons
D)isotopes and neutrons


4The atomic number of an element is the number of __________ in its nucleus.
A)neutrons
B)electrons
C)protons
D)isotopes


5If a substance can be broken down into two or more chemical elements, it is a
A)mixture.
B)solution.
C)element.
D)compound.


6Which of the following is not a type of chemical bond?
A)ionic
B)hydrogen
C)covalent
D)hydrophobic


7When elements share outer-shell electrons with other atoms, the chemical bond that forms is a
A)ionic bond.
B)hydrogen bond.
C)covalent bond.
D)elemental bond.


8__________ bonds form when an atom or group of atoms develops an electrical charge and attracts an atom or group of atoms with an opposite charge.
A)Ionic
B)Hydrogen
C)Covalent
D)Nonpolar covalent


9Which of the following is an electrolyte?
A)water
B)NaCl
C)glucose
D)ethane


10Distilled water has a pH of
A)5.
B)6.
C)7.
D)8.


11Which of the following is not a definition of pH?
A)pH = - log [H+]
B)pH = log([1/H+])
C)A measure of the hydrogen ion concentration
D)A measure of the hydroxyl ion concentration


12The key element in all organic molecules is
A)oxygen.
B)hydrogen.
C)nitrogen.
D)carbon.


13Substances that resist a change in pH are called
A)electrolytes.
B)bases.
C)buffers.
D)acids.


14The major source of energy in animals comes from
A)fats.
B)nucleic acids.
C)proteins.
D)carbohydrates.


15Two monosaccharides can combine to form a
A)isomer.
B)polysaccharide.
C)disaccharide.
D)hydrogen bond.


16Chitin is a good example of a
A)polysaccharide.
B)carbohydrate.
C)polymer.
D)all of these (a-c).


17Glycogen can be considered to be a
A)polysaccharide.
B)carbohydrate.
C)polymer.
D)all of these (a-c).


18Fats are lipid soluble molecules.
A)True
B)False


19The individual building blocks of proteins are called amino acids.
A)True
B)False


20When two amino acids bond, they form a tripeptide.
A)True
B)False


21A protein's linear sequence of amino acids is its secondary structure.
A)True
B)False


22Nucleotides are made up of nucleic acid subunits.
A)True
B)False


23NAD+ and FAD are nucleotide coenzymes.
A)True
B)False


24Testosterone and cholesterol are good examples of steroids.
A)True
B)False


25The three-dimensional arrangement of more than one polypeptide gives some proteins their quaternary structure.
A)True
B)False





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