Question

dna basics fill in the blanks... in dna, the phosphate and sugar molecules form the __________ of two strands. the strands are joined together by ________ bonds that nucleotides. adenine always bonds to ________ and cytosine always bonds to __________. the whole molecule is coiled like a twisted ladder, or double helix

Explanation:

In DNA structure, phosphate - sugar forms the backbone. Strands are joined by hydrogen bonds. Adenine pairs with thymine (A - T) and cytosine with guanine (C - G) (though guanine is not in the given options for the last blank, but based on the provided words, for the first three blanks: phosphate and sugar form backbones, strands joined by hydrogen bonds, adenine bonds to thymine).

Answer:

backbones, hydrogen, thymine