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Chapter 18: Problem 42

The DNA bases always hydrogen-bond in specific pairs. What are those pairs?

Short Answer

Expert verified
The specific hydrogen-bond pairs of the DNA bases are adenine (A) with thymine (T) and cytosine (C) with guanine (G), according to Chargaff's rules. These pairings are crucial for DNA replication, transcription, and stability.

Step by step solution

01

Identify the DNA bases

DNA (Deoxyribonucleic Acid) is made up of four bases: adenine (A), thymine (T), cytosine (C), and guanine (G). These bases are the genetic building blocks in DNA that store information and define an individual's characteristics.
02

Understand the hydrogen-bond pairing rules

The DNA bases hydrogen-bond with each other in specific pairs according to Chargaff's rules. These rules state that the amount of adenine (A) present will always equal the amount of thymine (T), and the amount of cytosine (C) will always equal the amount of guanine (G).
03

Present the specific pairs of hydrogen-bonding DNA bases

According to Chargaff's rules, the specific hydrogen-bond pairings of the DNA bases are as follows: 1. Adenine (A) always pairs with Thymine (T). 2. Cytosine (C) always pairs with Guanine (G). These base pairings are crucial for DNA replication, transcription, and the stability of the DNA structure.

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Key Concepts

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

Hydrogen Bonding
Hydrogen bonding is a crucial component in the formation and maintenance of DNA's double-helix structure. These weak bonds occur between the complementary DNA bases. In DNA, hydrogen bonds form between adenine and thymine and between cytosine and guanine. This occurs because each pair is specifically compatible in terms of hydrogen donors and acceptors.

  • Adenine and Thymine form two hydrogen bonds.
  • Cytosine and Guanine form three hydrogen bonds, making this bond slightly stronger.
These bonds are not as strong as covalent bonds within the DNA backbone but provide enough stability required for the double helix structure. Additionally, they allow for the strands to separate during DNA replication and transcription, ensuring that the genetic information can be accessed and copied when needed.
Chargaff's Rules
Chargaff's rules are fundamental principles that dictate the base pairing rules in DNA. Discovered by Erwin Chargaff, these rules state that, in a double-stranded DNA molecule, the amount of adenine (A) is equal to thymine (T), and the amount of cytosine (C) is equal to guanine (G). This reflects the complementary nature of the nucleotide bases.

  • This equal ratio is crucial for the DNA's structural integrity and function.
  • Chargaff's rules also provide insight into the molecule's proofreading abilities during DNA replication, ensuring accuracy.
These rules were vital in helping scientists, including Watson and Crick, determine the double helix structure of DNA, contributing significantly to the field of genetics.
Genetic Information
Genetic information is the blueprint for all living organisms, storing and transferring hereditary traits from one generation to the next. It is encoded within the sequence of DNA bases - adenine (A), thymine (T), cytosine (C), and guanine (G). Each sequence, or gene, holds specific instructions for building proteins, which in turn are responsible for nearly every cellular function.

  • The order of the DNA bases determines the genetic code, akin to how letters in the alphabet form words and sentences.
  • The regular pairing of these bases via hydrogen bonds ensures that the genetic information can be accurately copied and passed to new cells.
Understanding genetic information is vital for genetic research, medicine, and biotechnology, influencing fields like gene therapy and genetic engineering.
DNA Structure
The structure of DNA is famously described as a double helix, resembling a twisted ladder. This structure is key to its function in storing genetic information. The sides of the ladder are composed of a sugar-phosphate backbone, while the rungs are made of nitrogenous base pairs linked by hydrogen bonds.

  • The double helix enables the tight packing of DNA molecules in the nucleus.
  • The specific pairing of bases (A with T and C with G) ensures data is stored accurately, with mutations or errors minimized during replication.
This elegant design is not only fundamental to DNA's ability to carry genetic information but also facilitates the processes of replication and transcription. Understanding DNA structure is essential for fields such as genetics, molecular biology, and bioinformatics.

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Most popular questions from this chapter

(a) Draw the monomer 1,2 -dibromoethene. (b) Draw the polymer formed from this monomer, making it at least three monomer units long.

What is a monomer? How does a monomer unit differ from a monomer? Give an example of each.

In the olden days (the \(1970 \mathrm{~s})\), the sequence of amino acids in a protein was determined by running a series of chemical reactions known as the Edman degradation. This technique worked only on short peptide chains, however, and large proteins had to be broken down into small parts in order to be sequenced. One way to chop large proteins into small chains was with enzymes known as proteases. The protease trypsin breaks the amide bond on the \(\mathrm{CO}_{2} \mathrm{H}\) side of arginine and lysine, and the protease chymotrypsin breaks the amide bond on the \(\mathrm{CO}_{2} \mathrm{H}\) side of tyrosine, phenylalanine, and tryptophan. An octapeptide treated with trypsin breaks down to the peptides Ala-Gly-Trp-Gly-Lys and Thr-Val-Lys, and the same octapeptide treated with chymotrypsin breaks down to the peptides Gly-Lys and Thr-Val-Lys-Ala-Gly-Trp. What is the sequence of the octapeptide?

Define monosaccharide, disaccharide, and polysaccharide and give an example of each.

Carbomer, a polymer used to thicken cosmetic lotions and creams, is a polymer of the monomer known as acrylic acid, shown below. Polymerization occurs due to the \(\mathrm{C}=\mathrm{C}\) double bond as it does for polyethylene. (a) Draw the polymer. (b) When this polymer is exposed to aqueous base, it deprotonates, and the resulting carboxylate anion hydrogen bonds to water very well, causing thickening of the aqueous solution. Draw this polymer in its deprotonated form, and show how water would hydrogen bond to it.
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