hydatidiform mole, in human pregnancy, abnormal growth of the chorion, the outermost vascular membrane that in a normal ... Because of its unusual electronic structure, O2 is most easily reduced not by electron pairs but rather by single electrons ... The data accumulated by scientists of the early 20th century provided compelling evidence that chromosomes are the carriers of ... human genetic disease: Molecular oxygen: Molecular oxygen (O2), although essential for life, must be counted among the ...

Microorganisms, plants, and animals that have been given segments of human DNA are employed as living "drug factories" to make ... Colloid chemistry is concerned with substances such as rubber, plastics, fabrics, viruses, chromosomes, and gases. Tools used ... and right-handed forms like a pair of gloves. Stereoisomers are molecules with the same atom-to-atom bonding but different ... Researchers are also investigating how to insert DNA molecules into human cells or to chemically modify the DNA present in ...