During DNA replication, what occurs? A) The covalent bonds between pairs of nitrogenous bases are broken.
B) The hydrogen bonds between pairs of nitrogenous bases are broken.
C) The hydrogen bonds between sugar and phosphate molecules are broken.
D) The covalent bonds between sugar and phosphate molecules are broken.

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