Dna partially unwinds as the hydrogen bonds between complementary bases are broken. the enzyme responsible for this is:

What are four key elements of the study of economics?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands