In the polymerization of dna, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and of the last nucleotide in the polymer.

a) the 5' phosphate
b) c6
c) the 3' oh
d) a nitrogen from the nitrogen-containing base

C) the 3' OH

Explanation: OH group of phosphoric acid at carbon 5 reacts with the OH group of of other molecule at carbon 3 with release of H2O, forming two ester bonds.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.