The Following Is a Description of an Enzyme Called Superoxide

question 75

Multiple Choice

The following is a description of an enzyme called superoxide dismutase. Refer to this paragraph to answer the following question. Superoxide dismutase is an enzyme that detoxifies a free radical called superoxide. This radical is responsible for causing injury during reperfusion after a heart attack, and is also thought to play a role in Parkinson's Disease.^a Depending on what organism the protein is found in, it occurs either as a dimer or tetramer of identical subunits.^b The subunits are mostly -helical with some β-sheet near the C-terminus.^c A metal binding site for manganese, iron, nickel or copper/zinc is composed of residues from both the N-terminus and the C-terminus.^d These residues are: His-26, His-81, Asp-167, His-171.^e
Which statement refers to primary structure?

• A) a
• B) b
• C) c
• D) d
• E) e

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Definitions:

Spoon Nails

A condition of the fingernails where they are abnormally thin and concave in shape, resembling a spoon, often indicating iron deficiency or anemia.

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Swollen and Warm

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Abnormal condition in which a person must sit or stand to breathe comfortably.