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Chapter 15: Problem 91

What is base pairing? How does it pertain to DNA structure?

Short Answer

Expert verified
Base pairing is the hydrogen bonding between A and T, and G and C, ensuring DNA's double helix structure.

Step by step solution

01

- Understand Base Pairing

Base pairing is the specific hydrogen bonding between purines and pyrimidines in DNA. Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C). This principle is known as complementary base pairing.
02

- Double Helix Structure

DNA's structure is a double helix, which means it is made up of two strands twisted around each other. These strands are composed of a sugar-phosphate backbone with the bases pointing inward.
03

- Role of Base Pairing in DNA Structure

The complementary base pairing is crucial for the double helix structure because it ensures that the two strands are complementary to each other. The hydrogen bonds between the pairs stabilize the double-helical structure of DNA.

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Key Concepts

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

DNA structure
DNA, or deoxyribonucleic acid, is the hereditary material in nearly all living organisms. It is composed of two long chains of nucleotides twisted into a double helix. The backbone of each strand is made of alternating sugars (deoxyribose) and phosphate groups. Attached to each sugar is one of four nitrogenous bases: adenine (A), thymine (T), guanine (G), or cytosine (C). The sequence of these bases encodes genetic information.

Understanding this structure is key to grasping how genetic information is stored, replicated, and used in biological processes.
Complementary base pairing
Complementary base pairing is a foundational concept in the field of genetics. It refers to how bases pair specifically with each other across the two strands of DNA.

This pairing occurs because of hydrogen bonds that form between specific bases. Adenine (A) always pairs with thymine (T) forming two hydrogen bonds, while guanine (G) pairs with cytosine (C) forming three hydrogen bonds. This specificity is crucial because it ensures that DNA can be replicated accurately during cell division.

Without complementary base pairing, the genetic code would not be stable or easily replicated.
Hydrogen bonding in DNA
Hydrogen bonding plays a critical role in the structure and function of DNA. These bonds form between the nitrogenous bases and help to stabilize the double helix structure of the DNA molecule.

Adenine and thymine form two hydrogen bonds, while guanine and cytosine form three. This difference in bonding strength helps maintain the overall shape and stability of DNA.

Hydrogen bonds, while not as strong as covalent bonds, provide enough stability to keep the DNA intact but also allow it to unzip during processes like replication and transcription.
Double helix
The double helix is one of the most iconic symbols in biology. It describes the shape of the DNA molecule, which looks like a twisted ladder. Each rung of this ladder is composed of a pair of nitrogenous bases held together by hydrogen bonds.

The sugar-phosphate backbone forms the sides of the ladder, providing structural support. The double helix model was first described by James Watson and Francis Crick in 1953, and it has since become a fundamental concept in genetics.

The helical shape allows the DNA to be packed efficiently into the cell nucleus and plays a crucial role in the molecule's ability to replicate and repair itself.

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Most popular questions from this chapter

Breaking the \(\mathrm{C}=\mathrm{C} \pi\) bond in a retinal molecule in the eye requires approximately \(250 \mathrm{~kJ} / \mathrm{mol}\). Find the longest wavelength (in \(\mathrm{nm}\) ) of visible light that has the energy to break that \(\pi\) bond.

What linkage joins the monomers in each strand of DNA?

Which objects are asymmetric (have no plane of symmetry): (a) a circular clock face; (b) a football; (c) a dime; (d) a brick; (e) a hammer; (f) a spring?

Complete hydrolysis of a \(100.00-\mathrm{g}\) sample of a peptide gave the following amounts of individual amino acids (molar masses, in \(\mathrm{g} / \mathrm{mol}\), appear in parentheses $$ \begin{aligned} &\begin{array}{ll} 3.70 \mathrm{~g} \text { of valine }(117.15) & 6.90 \mathrm{~g} \text { of proline }(115.13) \end{array}\\\ &7.30 \mathrm{~g} \text { of serine }(105.10) \quad 86.00 \mathrm{~g} \text { of arginine }(174.21) \end{aligned} $$ (a) Why does the total mass of amino acids exceed the mass of peptide? (b) What are the relative numbers of amino acids in the peptide? (c) What is the minimum molar mass of the peptide?

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