DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

None of these
ionic bonds between the pair of bases
hydrogen bonds between the pair of bases
covalent bonds between the pair of bases

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DNA Structure and Replication
The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?

All of these
Some S amino acids cause proteins to bend; others cause protein to flatten.
The many different amino acid R groups on proteins confer many different shapes.
DNA has one main function in cells whereas proteins have many.

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DNA Structure and Replication
In DNA, nucleotides are covalently joined together by

3', 4' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 3' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain

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