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.
Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf
Water binding in hemoglobin
PET scan of a normal brain.
Normal right tympanic membrane
Normal electrocardiogram tracing
Vitamin and minerals are essential for normal body functioning.