"The Native Structure of H[a]emoglobin (Hb) Comprises of Two α

question 23

Multiple Choice

"The native structure of h[a]emoglobin (Hb) comprises of two α and two β subunits, each of which carries a h[a]em 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)
-Haemoglobin is ________.

• A) a tertiary protein with two polypeptides
• B) a quaternary protein with two polypeptides
• C) a tertiary protein with four polypeptides
• D) a quaternary protein with four polypeptides

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Definitions:

Belt of Stability

A term used in nuclear physics to describe the region on a chart of nuclides where stable nuclei exist, based on their neutron to proton ratio.

Beta Decay

A radioactive decay process where a beta particle (electron or positron) is emitted from an atomic nucleus, altering the original element to a different one.

Belt of Stability

A graphical representation used in nuclear physics to depict stable nuclei based on their neutron-to-proton ratio.

Beta Decay

A radioactive decay process where a nucleus emits beta particles, resulting in the transformation of a neutron into a proton or vice versa.