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1
Which one of the following statements about carbon is correct?
A)Hydrocarbons tend to be readily soluble in water.
B)Carbon can form a total of five covalent bonds with other atoms.
C)Carbon can bind to a wide variety of functional chemical groups, provided none of those groups contains nitrogen.
D)The hydrogen atoms linked to the two carbons of a carbon-carbon double bond can be on the same side of the carbons or on different sides of the carbons.
E)Carbon-containing compounds are typically only found in organisms that inhabit the most extreme environments on Earth.
2
Which one of the following is not considered a biological macromolecule?
A)Nucleic acids
B)Carbohydrates
C)Proteins
D)Vitamins
E)Lipids
3
Wohler's synthesis of urea helped to disprove the belief known as
A)vitalism.
B)evolution.
C)mysticism.
D)creationism.
E)reductionism.
4
Which one of the following elements is carbon least likely to covalently bond with?
A)Sulfur
B)Hydrogen
C)Oxygen
D)Nitrogen
E)Phosphorus
5
Which property of carbon-carbon bonds makes it a stable element in a wide range of temperatures?
A)Carbon always bonds to an atom with a higher electronegativity.
B)Carbon always bonds to an atom with a lower electronegativity.
C)Carbon always bonds to an atom with an equal electronegativity.
D)The distance between two carbon atoms in a carbon-carbon bond is quite short.
E)The distance between two carbon atoms in a carbon-carbon bond is quite long.
6
D-glucose and L-glucose are examples of
A)structural isomers.
B)cis-trans stereoisomers.
C)enantiomers.
D)structural isomers and enantiomers
E)structural isomers, cis-trans stereoisomers, and enantiomers.
7
Most naturally occurring monosaccharides are levorotary.
A)True
B)False
8
The bonds created between monosaccharides to form polysaccharides are known as ________________ and are formed by ________________.
A)hydrogen bonds : condensation reactions.
B)glycosidic bonds : hydrolysis.
C)hydrogen bonds : dehydration synthesis.
D)glycosidic bonds : dehydration synthesis.
E)non polar covalent bonds : condensation reactions.
9
True or False: A triglyceride is formed by ester bonds between the hydroxyl groups in glycerol and the carboxyl groups in each of three fatty acid chains.
A)True
B)False
10
Which one of the following statements about lipids is correct?
A)Fatty acids typically have an odd number of carbon atoms in them.
B)A fatty acid with no carbon double bonds is called a polyunsaturated fatty acid.
C)Oils are less likely to be high in unsaturated fatty acids.
D)The lower the content of saturated fatty acids, the higher the melting point.
E)Polyunsaturated lipids are usually liquid at room temperature.
11
Phospholipid molecules are most accurately described as
A)hydrophobic.
B)amphipathic.
C)hydrophilic.
D)monounsaturated.
E)ionic.
12
Which of the following statements regarding steroids is incorrect?
A)Cholesterol is a form of steroid.
B)Steroids can contribute to blood vessel blockage in animals.
C)Steroids can take on forms that are highly soluble in water due to the addition of many hydroxyl groups to their base ring structure.
D)Steroids are a form of lipid with a distinctly different chemical structure but similar function.
E)Steroids are found in cell membranes in animals.
13
Which one of the following roles is commonly performed by proteins?
A)Catalysis
B)Transport
C)Cell signaling
D)Movement
E)All of these roles are commonly performed by proteins.
14
Which level of protein structure would be most affected by a drastic change in pH?
A)Primary
B)Secondary
C)Tertiary
D)Quarternary
E)Any of the levels of structure would be affected by a change in pH.
15
All proteins will form a quarternary structure.
A)True
B)False
16
Match the level of protein structure on the left with the appropriate description on the right.
Level of Protein StructureDescription
I: PrimaryA: 3-dimensional shape of polypeptide chain
II: SecondaryB: Hydrogen bonding within peptide backbone
III: TertiaryC: Assembly of subunits into functional protein
IV: QuarternaryD: Linear sequence of amino acids
A)i = a; ii = b; iii = d; iv = c
B)i = d; ii = a; iii = b; iv = c
C)i = c; ii = b; iii = a; iv = d
D)i = d; ii = b; iii = a; iv = c
E)i = a; ii = b; iii = c; iv = d
17
True or False: Domains are portions of proteins with a distinct 3-D shape and function that may also be found in other proteins with similar functions.
A)True
B)False
18
Which one of the following would least likely be found in a molecule of DNA?
A)Deoxyribose
B)Phosphate
C)Uracil
D)Guanine
E)Thymine
19
An organism is found whose DNA content is determined to be 35% guanine. What percentage of this organism's DNA is thymine?
A)15%
B)30%
C)35%
D)65%
E)The percentage of adenine cannot be determined from the information given.
20
True or False: More energy would be required to separate a C-G base pair than an A-T base pair.
A)True
B)False





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