At the isoelectric point,the amino acid alanine will exist as what structure?
A) A positive ion
B) A negative ion
C) An uncharged molecule
D) A zwitterion
E) A carbocation
Correct Answer:
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Q21: The secondary structure of proteins is held
Q22: Which amino acid is shown? 
Q23: Which of the following DNA base pairs
Q24: Which attractive force is responsible for maintaining
Q25: The difference(s)between DNA and RNA is (are):
A)
Q27: Which of the following amino acids contains
Q28: Which amino acid is responsible for the
Q29: What process would one use to make
Q30: Amino acids are covalently bonded to
Q31: The organic portion of which of the
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