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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

110 daltons
80 daltons
150 daltons
118 daltons

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Structure and Properties of Amino Acids
Which of the following is an essential amino acid?

All of these
Methionine
Tryptophan
Lysine

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Structure and Properties of Amino Acids
Which pair of amino acids absorbs the most UV light at 280 nm?

Cystein & Asparagine
Phenylalnine & Proline
Trp & Tyrosine
Threonine & Histidine

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

specialized
accessory
essential
trace

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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
Leucine, threonine, and lysine
Isoleucine, valine and phenylalanine

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Structure and Properties of Amino Acids
When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes

nonpolar
a cation
an isotope
a zwitterions

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