What is the most plentiful gas in our current atmosphere on earth? A) oxygen
B) helium
C) hydrogen
D) nitrogen

step 1: replication fork formation.

step 2: primer binding.

step 3: elongation.

step 4: termination.

explanation:

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.