Biology help - How do the nucleotides in DNA bond with each other within a strand?

Question

Would love for some help on a biology question :)
1a - How do the nucleotides in DNA bond with each other within a strand?
1b - How do they bond with each other across strands?

Answer 1

1A...The pattern within the strand is determined by the amino acid sequence the formed the strand. For example G-A-T-T-A-C-A. Within the sides fo the ladder the phosphate group of one nucelotide bonds with the deoxyribose sugar of another nucleotide to form the sides of the "Ladder"
1B The nitrogenous bases hydrogen bond with thier complementary nitrogenous base across the ladder to form the "rungs" of the ladder.
A double bonds with T and C triple bonds with G. So for the example above if it is the sense strand, its anti sense (opposite) strand would be.... C-T-A-A-T-G.

Answer 2

Hydrogen bonds--- The two strands of DNA are held together by weak hydrogen bonds (for 1a and1b)

Answer 3

1a - glycosidic linkages
1b - hydrogen bonds (2 for adenine and thymine; 3 for guanine and cytosine)

Answer 4

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Answer 5

hydrogen bonds in both cases.