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Monday, December 23, 2013
Condensation and Hydrolysis Reactions
Which polymers are composed of amino acids?
Proteins are composed of amino acids joined together.
Which of the following is
attached to the central carbon atom in an amino acid?
A side chain ("R group")
A carboxyl functional group
An amino functional group
The central carbon atom in an amino acid is bonded to an amino functional group, a carboxyl functional group, a side chain, and
Which part of an amino acid is always acidic?
Side chain ("R group")
Carboxyl functional group
None of the above
Amino functional group
The carboxyl group (COOH) contains two oxygen atoms that tend to pull electrons away from the hydrogen atom, so this group tends to lose a proton and is acidic.
Which monomers make up RNA?
Nucleotide monomers make up nucleic acids.
Which of the following statements about the formation of polypeptides from amino acids is true?
The reaction occurs through the addition of a water molecule to the amino acids.
A bond can form between any carbon and nitrogen atom in the two amino acids being joined.
A bond forms between the carboxyl functional group of one amino acid and the amino functional group of the other amino acid.
Polypeptides form by condensation or hydrolysis reactions.
A hydroxyl group is removed from the carboxyl group of one amino acid and hydrogen is removed from the amino group of the other amino acid, allowing a bond to form between the two groups.
True or false? Enzymes in the digestive tract catalyze hydrolysis reactions.
Enzymes in the digestive tract break down food molecules, which is a process that occurs by hydrolysis.
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