under contract means there is an offer on it already and the buyer and seller are negotiating back and forth to come to an agreement. if ya need any more help just e-mail me. Lori lspalletta Â· 1 decade ago
Premature atrial complexes are caused by abnormal electrical impulses transmitted by the atria (either of the upper chambers of the heart). The abnormal electrical impulses cause contractions of the upper chamber of the heart earlier than expected. Such premature beats are generally harmless. slide 1 of 7.
As a result,red blood cells spontaneously sickle in the peripheralblood if the amount of sickle hemoglobin is greaterthan 60%.â¢3.Nonsense mutation: altered DNA codes for a stop codonthat causes premature termination of protein synthesis.In p-thalassemia major, a nonsense mutation produces a stop codon that causes premature termination of DNA transcription of the P-globin chain.Consequently, there is a marked decrease in thesynthesis of hemoglobin A (a2(32), resulting in amicrocytic anemia ...