How are the nitrogenous bases (A, G, C, T) joined to the DNA backbone?Group of answer choicesThey make covalent bonds with both the deoxyribose and the phosphate.They are covalently bound to the deoxyribose.They are covalently bound to the phosphate group.They interact through ionic interactions with the deoxyribose.They interact through ionic interactions with the phosphate group.
Question
How are the nitrogenous bases (A, G, C, T) joined to the DNA backbone?Group of answer choicesThey make covalent bonds with both the deoxyribose and the phosphate.They are covalently bound to the deoxyribose.They are covalently bound to the phosphate group.They interact through ionic interactions with the deoxyribose.They interact through ionic interactions with the phosphate group.
Solution
The nitrogenous bases (A, G, C, T) are covalently bound to the deoxyribose in the DNA backbone.
Here's a step-by-step explanation:
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DNA is composed of two strands, each made up of repeating units called nucleotides.
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Each nucleotide is composed of three parts: a phosphate group, a deoxyribose sugar, and a nitrogenous base.
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The nitrogenous bases are adenine (A), guanine (G), cytosine (C), and thymine (T).
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The deoxyribose sugar and the phosphate group form the backbone of the DNA strand, while the nitrogenous bases stick out from this backbone.
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The nitrogenous bases are attached to the deoxyribose sugar through a covalent bond. This bond is specifically a beta-N-glycosidic bond, which is a type of covalent bond that forms between a carbohydrate (in this case, the deoxyribose sugar) and another molecule (in this case, the nitrogenous base).
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The phosphate group is also attached to the deoxyribose sugar, but it is not directly attached to the nitrogenous base.
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Therefore, the correct answer is "They are covalently bound to the deoxyribose."
Similar Questions
In DNA, which type of bonding occurs between the nucleotide bases? aA - B and C - D bA - C and T - G cA - G and U - T dA - T and G - C
In a DNA molecule, ______ bonds form between nitrogenous bases, such that A (adenine) pairs with its complement ______, and G (guanine) pairs with its complement ______.Multiple choice question.hydrogen; T (thymine); C (cytosine)hydrogen; G (guanine); T (thymine)ionic; C (cytosine); T (thymine)ionic; T (thymine); G (guanine)
How many phosphate groups sit between each sugar in the DNA backbone?
Students are studying a model fragment of a DNA double helix. In the model they can see nucleotides linked together by 16 phosphodiester bonds, 9 stacked pairs of nitrogenous bases and 3 of the nitrogenous bases are thymine.This DNA double helix fragment therefore contains:Select one alternative:16 deoxyribose molecules and 6 adenine nitrogenous bases.18 deoxyribose molecules and 6 adenine nitrogenous bases.9 deoxyribose molecules and 3 adenine nitrogenous bases.18 deoxyribose molecules and 3 adenine nitrogenous bases.
DNA has the code to make a protein that gives organisms their traits.What joins the two complementary bases together?Select one:a.Helicase that forms the double helixb.Peptide bonds between DNA codonsc.Hydrogen bonds between nitrogen basesd.Nitrogen bonds between the sugar-phosphate backbone
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