Which part of the nucleotides structure is responsible for the incredible variation that exist amongst all types of organisms?
A. sugar(ribose)
B. Nitrogenous base
C. sugar (deoxyribose)
D. phosphate group (-P04)

Which series lists the correct order of steps of binary fission from first to last? sex pilus connects two cells ® plasmid dna is transferred ® complementary dna strands are created ® cells separate live cells bind to degraded cells ® dna is transported across the membrane ® dna is incorporated into recipient's dna virus infects bacterial cell, new viruses are made ® dna is assembled in new virus ® new virus infects another bacterial cell and transfers dna dna is copied ® dna molecules attach to cell membrane ® cell membrane elongates and pinches off ® two identical cells are produced