Scelta multipla
In DNA structure, a nucleotide of DNA may contain which of the following components?
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7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
In the DNA double helix, what holds the two antiparallel strands together?
A
Ionic bonds between the phosphate groups on opposite strands
B
Covalent phosphodiester bonds between bases across the two strands
C
Hydrogen bonds between complementary nitrogenous bases (A–T and G–C)
D
Peptide bonds formed between deoxyribose sugars on opposite strands
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Understand the structure of DNA: DNA consists of two antiparallel strands forming a double helix.
Identify the backbone of each strand: Each strand has a sugar-phosphate backbone connected by covalent phosphodiester bonds.
Recognize that the two strands are held together not by covalent bonds but by interactions between nitrogenous bases.
Recall that complementary base pairing occurs between adenine (A) and thymine (T), and between guanine (G) and cytosine (C).
Know that these complementary bases are connected by hydrogen bonds, which stabilize the double helix by holding the two strands together.
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