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Chapter 17: Problem 104

In DNA, how many hydrogen bonds form between guanine and cytosine? (17.3)

Short Answer

Expert verified
Guanine and cytosine form three hydrogen bonds.

Step by step solution

01

Identify the DNA base pairs

In DNA, the bases pair through hydrogen bonding: adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).
02

Focus on the Guanine-Cytosine pair

Among the base pairs, the exercise is asking about the hydrogen bonds between guanine (G) and cytosine (C).
03

Determine the number of hydrogen bonds

Guanine (G) and cytosine (C) form three hydrogen bonds between them. This is due to their specific molecular structures allowing for three points of hydrogen bonding.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

guanine-cytosine hydrogen bonding
In DNA, the connection between the nitrogenous bases is pivotal for the molecule's stability and function. Guanine (G) pairs with cytosine (C) through hydrogen bonding. This specific interaction is important because hydrogen bonds are weak individually but, when numerous, they impart considerable stability to the DNA structure. This kind of bonding ensures the DNA strands stay together, especially during processes like replication. Each base pair combination is specialized, with guanine and cytosine fitting perfectly to form hydrogen bonds due to their complementary shapes and charges.
three hydrogen bonds
The pairing of guanine and cytosine in DNA is unique because they form three hydrogen bonds between them. These bonds arise due to the specific molecular features of these bases:
  • Guanine has a strong affinity for cytosine due to their complementary properties.
  • Three hydrogen bonds occur between guanine and cytosine, making this pairing very stable.
This increased number of bonds makes the G-C pair more stable compared to the adenine-thymine (A-T) pair, which has only two hydrogen bonds. The three hydrogen bonds contribute to the robustness of the DNA structure, especially in regions rich in G-C pairs.
molecular structure of DNA
The molecular structure of DNA is a double helix, resembling a twisted ladder. This iconic shape is possible due to the precise pairing of bases through hydrogen bonds. Each nucleotide in DNA has three components: a phosphate group, a sugar molecule, and a nitrogenous base. The bases pair specifically: adenine with thymine, and guanine with cytosine. The regular pattern of these pairings, and particularly the strong trio of hydrogen bonds in G-C pairs, helps maintain the DNA's uniform shape and stability. This meticulous arrangement ensures that genetic information is accurately replicated and passed on during cell division.

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Most popular questions from this chapter

What is a point mutation?

Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide from each of the following mRNA sequences: a. AAA CCC UUG GCC b. CCU CGC AGC GGC UGA c. AUG CAC AAG GAA GUA CUG

If the DNA double helix in humans contains \(20 \%\) cytosine. what is the percentage of guanine, adenine, and thymine? (17.3)

Identify each of the following bases as a purine or a pyrimidine: a. Uracil (U) b. Guanine (G)

Match the following statements with rRNA, mRNA, or tRNA: (17.4) a. is the smallest type of RNA b. makes up the highest percentage of RNA in the cell c. carries genetic information from the nucleus to the ribosomes
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