In order for DNA to be replicated, where is the DNA molecule unzipped? * A: Between the phosphate and the sugar

B: Between the hydrogen bonds of the nucleotides

C: After each codon

D: Between each deoxyribose sugar

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes