Use the Following Information to Answer the Question

question 9

Multiple Choice

Use the following information to answer the question.
"The native structure of hemoglobin (Hb) comprises of two α and two β subunits, each of which carries a heme group. There appear to be no previous studies that report the in-vitro folding and assembly of Hb from highly unfolded α and β globin in a 'one-pot' reaction. One difficulty that has to be overcome for studies of this kind is the tendency of Hb to aggregate during refolding. This work demonstrates that denaturation of Hb in 40% acetonitrile at pH 10.0 is reversible." (J Am Soc Mass Spectrum 2007, 18, 8-16)
How many heme groups are present in three hemoglobin protein molecules?

• A) 3
• B) 4
• C) 9
• D) 12

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Definitions:

Psychological Instruments

Tools and tests used by psychologists to measure mental functions and behaviors.

Dubious Distinction

A questionable or uncertain honor or recognition, often implying that the merit of the distinction is not entirely positive.

Defense Mechanism

Psychological strategies brought into play by individuals or the ego to protect against anxiety arising from unacceptable thoughts or feelings.

Subconsciously Attributes

Subconsciously attributes refer to qualities or features that are assigned or associated with something without conscious awareness.