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6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Describe the function of the endomembrane system? what organelles are involved?