The Structural Formulas for the 20 Naturally Occurring Amino Acid

question 30

Short Answer

The structural formulas for the 20 naturally occurring amino acid residues are shown in the panel below. Answer the following question(s) with the help of this panel.

-Which amino acid residues shown above have acidic side chains? Write down the one-letter abbreviations for them, in alphabetical order, e.g. ACGNV.

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Definitions:

Flagellum

A slender, whip-like appendage that enables many protozoa, bacteria, and spermatozoa to swim.

Microvilli

Minute projections of the plasma membrane that increase the surface area of the cell; found mainly in cells concerned with absorption or secretion, such as those lining the intestine or the kidney tubules.

Choanoflagellate

Single-celled organisms that are considered to be the closest living relatives of animals, characterized by a flagellum surrounded by a collar of microvilli.

Rhizaria

A supergroup of mainly unicellular eukaryotes, characterized by their amoeboid movement mechanism and often elaborate shells.