Multiple Choice
In the context of DNA structure, DNA is a polymer made of repeating subunits called:
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the DNA double helix, what type of bond holds each individual DNA strand together along its sugar-phosphate backbone?
A
Covalent phosphodiester bonds
B
Hydrogen bonds between complementary bases
C
Peptide bonds between nucleotides
D
Ionic bonds between phosphate groups
Verified step by step guidance1
Understand the structure of a DNA strand: DNA consists of a sugar-phosphate backbone with nitrogenous bases attached to the sugar molecules.
Identify the bonds that connect the sugar and phosphate groups within a single DNA strand: these are covalent bonds known as phosphodiester bonds.
Recognize that hydrogen bonds occur between complementary nitrogenous bases on opposite strands, not along the backbone.
Recall that peptide bonds link amino acids in proteins, so they are not involved in DNA structure.
Note that ionic bonds are not the primary bonds holding the sugar-phosphate backbone together in DNA.
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