A nucleotide is about to be added to a growing strand of DNA. What factor determines which type of nucleotide will be added? A. the length of the DNA strand B. random chance C. the type of cell in which replication is taking place D. base-pairing rules

How does the closing of the ductus arteriosus and ductus venosus alter circulation in an infant? a. increases blood flow to the pulmonary artery and increases blood flow to the umbilical vein b. increases blood flow to the pulmonary artery and reduces blood flow to the umbilical vein c. reduces blood flow to the pulmonary vein and increases blood flow to the umbilical artery d. reduces blood flow to the pulmonary vein and reduces blood flow to the umbilical artery