Multiple Choice
Which of the following lists correctly identifies the four nitrogenous bases found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
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In a DNA double helix, which type of bond holds the two complementary strands together?
A
Ionic bonds
B
Covalent bonds
C
Hydrogen bonds
D
Disulfide bonds
Verified step by step guidance1
Understand the structure of the DNA double helix: it consists of two complementary strands made up of nucleotides.
Recognize that the backbone of each strand is held together by covalent bonds called phosphodiester bonds, which link the sugar and phosphate groups.
Identify that the two strands are paired through interactions between nitrogenous bases (adenine with thymine, and guanine with cytosine).
Recall that the bonds holding these complementary bases together are hydrogen bonds, which are weaker than covalent bonds and allow the strands to separate during processes like replication.
Conclude that the correct type of bond holding the two complementary DNA strands together is hydrogen bonds.
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