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Proteins, nucleic acids, lipids and carbohydrates all have certain characteristics in common. Which of the following is not a common characteristic?
A)They are organic, which means they are all living substances.
B)They all contain the element carbon.
C)They contain simpler units that are linked together making larger molecules.
D)They all contain functional groups.

A peptide bond forms by:
A)a condensation reaction.
B)dehydration synthesis.
C)the formation of a covalent bond.
D)all of these.

Protein motifs are considered a type of
A)primary structure.
B)secondary structure.
C)tertiary structure.
D)quaternary structure.

The substitution of one amino acid for another
A)will change the primary structure of the polypeptide.
B)can change the secondary structure of the polypeptide.
C)can change the tertiary structure of the polypeptide.
D)All of these are correct.

Chaperone proteins function by
A)providing a protective environment in which proteins can fold properly.
B)degrading proteins that have folded improperly.
C)rescuing proteins that folded incorrectly and allow them to refold into the proper configuration.
D)both A and C are correct.

Which of the following lists the purine nucleotides?
A)adenine and cytosine
B)guanine and thymine
C)cytosine and thymine
D)adenine and guanine

The two strands of a DNA molecule are held together through base-pairing. Which of the following best describes the base-pairing in DNA?
A)Adenine forms two hydrogen bonds with thymine.
B)Adenine forms two hydrogen bonds with uracil.
C)Cytosine forms two hydrogen bonds with guanine.
D)Cytosine forms two hydrogen bonds with thymine.

A characteristic common to all lipids is
A)that they contain long chains of C-H bonds.
B)that they are insoluble in water.
C)that they have a glycerol backbone.
D)All of these are characteristics of all lipids.

Carbohydrates have many functions in the cell. Which of the following is an incorrect match of the carbohydrate with its function?
A)sugar transport in plants--disaccharides
B)energy storage in plants--starches
C)energy storage in plants--lactose
D)sugar transport in humans--glucose

Which of the following carbohydrates is associated with plants?

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