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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
What is the heaviest of the twenty amino acids?

Histidine
Tryptophan
Tyrosine
Phenylalanine

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Structure and Properties of Amino Acids
How many different amino acids are there?

3
An infinite number
100
20

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

ion conversion
amphions
ambions
zwitterions

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Structure and Properties of Amino Acids
Stereo chemical configuration of all a-amino acids derived from proteins is

L and D
L
None of these
D

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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 __________ .

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

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Structure and Properties of Amino Acids
Which of the following is a nonprotein amino acid?

Cystine
Hydroxylysine
None of these
Dopamine

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