Multiple Choice
What do sticky ends allow in the context of DNA manipulation?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Which type of bond is primarily responsible for holding together nitrogenous bases in the DNA double helix?
A
Hydrogen bonds
B
Disulfide bonds
C
Ionic bonds
D
Covalent bonds
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of two strands forming a double helix, where nitrogenous bases pair between the strands.
Identify the types of bonds in DNA: The sugar-phosphate backbone is held together by covalent bonds, specifically phosphodiester bonds, while the bases pair across the strands.
Focus on the interaction between nitrogenous bases: The bases pair through specific interactions that allow the two strands to stay together but also separate during processes like replication.
Recall that the bases are held together by hydrogen bonds, which are weaker than covalent bonds but strong enough to stabilize the double helix and allow strand separation when needed.
Conclude that hydrogen bonds are primarily responsible for holding the nitrogenous bases together in the DNA double helix.
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