The Following Is a Description of an Enzyme Called Superoxide

question 9

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 a prosthetic group?

• A) a
• B) b
• C) c
• D) d
• E) e

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Definitions:

Preoccupation

An absorption or obsession with a thought or feeling that persistently occupies the mind.

Impulsively Acting Out

Exhibiting behavior characterized by little or no forethought, reflection, or consideration of the consequences.

Avoiding Incidents

Strategies or actions undertaken to prevent or minimize the occurrence of adverse events.

Compromised Coping

A reduced ability to deal with stressful situations, leading to ineffective management of life's demands.