Choose the best answer.

1		Compared with inorganic compounds in general, most organic compounds ___________________.
			A)	are more readily soluble in water
			B)	are more easily decomposed by heat
			C)	react more rapidly
			D)	form ions more readily in solution
2		The number of covalent bonds each carbon atom has in organic compounds is usually _________________.
			A)	one
			B)	two
			C)	four
			D)	six
3		Natural gas and petroleum consist mainly of ________________.
			A)	unsaturated hydrocarbons
			B)	aromatic hydrocarbons
			C)	alkanes
			D)	aldehydes and ketones
4		Compounds that have the same molecular formulas but different structural formulas are called ________________.
			A)	hydrocarbons
			B)	isomers
			C)	polymers
			D)	derivatives
5		Hydrocarbon molecules with only single bonds between carbon atoms are _________________.
			A)	fairly reactive
			B)	fairly unreactive
			C)	extremely dense
			D)	unsaturated
6		Hydrocarbon molecules with double or triple bonds between carbon atoms are __________________.
			A)	fairly reactive
			B)	fairly unreactive
			C)	extremely dense
			D)	saturated
7		Which of the following compounds can exist?
			A)	C2H3
			B)	C2H4
			C)	C2H5
			D)	C2H7
8		The benzene molecule is notable for having a _______________.
			A)	ring of six carbon atoms
			B)	ring that can consist of any number of carbon atoms
			C)	straight chain of six carbon atoms
			D)	helix of carbon atoms
9		The conversion of sugar to ethanol and carbon dioxide with enzymes acting as catalysts is called ________________.
			A)	fermentation
			B)	polymerization
			C)	photosynthesis
			D)	digestion
10		Organic acids are _________________.
			A)	strong and highly corrosive
			B)	rather weak
			C)	not found in nature but must be artificially made
			D)	characterized by simple molecules
11		The reaction of ethanol with acetic acid produces ethyl acetate, which is a (an) _________________.
			A)	aldehyde
			B)	ester
			C)	aromatic compound
			D)	polymer
12		A long chain of identical simple molecules linked together is called a (an) ________________.
			A)	monomer
			B)	polymer
			C)	isomer
			D)	elastomer
13		Living things differ most from one another in their constituent ________________.
			A)	carbohydrates
			B)	lipids
			C)	amino acids
			D)	proteins
14		Carbohydrates are produced in green plants by _____________.
			A)	polymerization
			B)	fermentation
			C)	photosynthesis
			D)	respiration
15		Sugars and starches are examples of _________________.
			A)	lipids
			B)	carbohydrates
			C)	proteins
			D)	nucleic acids
16		Proteins consist of combinations of ________________.
			A)	amino acids
			B)	nucleic acids
			C)	esters of glycerin with organic acids
			D)	DNA and RNA molecules
17		The matching of blood types before a transfusion is to ensure that the blood of donor and recipient both have the same __________________.
			A)	carbohydrates
			B)	proteins
			C)	lipids
			D)	nucleic acids
18		Most biochemical processes in living matter are catalyzed by _________________.
			A)	enzymes
			B)	glycogen
			C)	lipids
			D)	DNA
19		The structure of a DNA molecule resembles a __________________.
			A)	single helix
			B)	double helix
			C)	pleated ribbon
			D)	straight chain
20		Each three-nucleotide group in a DNA molecule corresponds to a particular __________________.
			A)	amino acid
			B)	nucleic acid
			C)	enzyme
			D)	protein