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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
Amino acids required in the human diet and not synthesized by the body are called

specialized
accessory
trace
essential

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Structure and Properties of Amino Acids
Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?

Lysine, arginine and histidine
Phenylalanine, valine, and aspartate
Isoleucine, valine and phenylalanine
Leucine, threonine, and lysine

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Structure and Properties of Amino Acids
Which of the following amino acids can form hydrogen bonds with their side (R) groups?

All of these
Asparagine
Glutamine
Aspartic acid

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Structure and Properties of Amino Acids
The isoelectric point of an amino acid is defined as the pH

of maximum electrolytic mobility
where the carboxyl group is uncharged
where the molecule carries no electric charge
where the amino group is uncharged

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

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Structure and Properties of Amino Acids
Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?

Aspartate & Glutamate
Histidine & Lysine
Asparagine & Glutamine
Leucine & Glycine

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