Eustachian Tube Growth and Development: Anatomy/Function. Protocol Description. This study measures Eustachian tube function and facial growth over time in three groups of children: one with recurrent ear infections, one with chronic middle ear fluid, and one with little past history of otitis media.
Causes of Kartagener syndrome. Kartagener syndrome is caused by a mutation in the DNAI1 gene, which makes a cellular protein required for normal functioning cilia (cilia line the respiratory tract) and sperm motility.
The mutation that causes sickle cell disease. A. occurs in the same gene that, when mutant in a different way, causes beta thalassemia. B. deletes two contiguous DNA bases. C. results in a single DNA base change that does not alter the encoded amino acid. D. changes a valine to a glutamic acid in the beta globin gene.