Normal hemoglobin is a tetramer, consisting of two molecules of β hemoglobin and two molecules of α hemoglobin. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibers. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits
A) altered primary structure.
B) altered secondary structure.
C) altered tertiary structure.
D) altered quaternary structure.
E) altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered.
Bartel and Szostak demonstrated chemical selection for RNA molecules that can catalyze phosphoester
A Mitochondrion Converts Energy from Fuel Molecules into ATP
Normal defese mechanisms against infection
Normal lab values
A gauge reading with the needle fluctuating 3 to 9 inches Hg below normal often indicates a vacuum ...
A color-enhanced electron micrograph of circular plasmid molecules