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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
In a polypeptide average mass of an amino acid residue is

80 daltons
150 daltons
118 daltons
110 daltons

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Structure and Properties of Amino Acids
The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

1.1, and 12.1
6.5, and 8.0
2.2, and 9.4
3.3, and 10.5

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Structure and Properties of Amino Acids
Serine and threonine are polar amino acids due to

reactive hydroxyl group in the side chain
reactive alcoholic group in the side chain
reactive keto group in the side chain
reactive aldehyde group in the side chain

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Structure and Properties of Amino Acids
Molecules that bear charged groups of opposite polarity are known as

amphions
ion conversion
ambions
zwitterions

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Structure and Properties of Amino Acids
Which of the following is not an essential amino acid?

Aspartic acid
Glycine
Glutamic acid
All of these

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Structure and Properties of Amino Acids
Protein fluorescence arises primarily from which residue?

Arginine
Phenylalanine
Tryptophan
Tyrosine

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