All dna polymerases synthesize new dna by adding nucleotides to the of the growing dna chain.

3’ OH group

DNA polymerase is responsible for synthesis of DNA and it is one of the key enzymes in DNA replication. They function by adding nucleotide one by one to the growing DNA by incorporating only those that are complementary to the template. However, DNA polymerase synthesizes DNA in the 5’ to 3’ direction by adding dNTP to the 3’ OH group of the growing chain.

the fossil record provides evidence of a common ancestor to many species.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.