11.2 Nucleic Acid Structure

11.2 Nucleic Acid Structure

• Discuss and interpret the work of Franklin, Chargaff, and others.

• Function is determined by structure in biology.

• Double helix biologists want to understand the function of a material at the molec ular and cellular level, they focus some of their efforts on determining its biochemical structure.
• Understanding the structure of DNA has made it easier for us to understand how it can store information, how it can be replicated and how it can cause variation in its structure.

• The term derives from the discovery of DNA by Friedrich Miescher in 1869.
• He found a novel substance from the white blood cells in the bandages.
• He named the substance.
• As the structure of DNA and RNA became better understood, they were found to be acidic, which means they release hydrogen ion (H+) in solution and have a net negative charge at neutral pH.

• The name nucleic acid was created.

• Structural features of DNA are different at different levels of complexity.

• The structure resembles a spiral staircase.

• In living cells, there is an array of different found only in DNA.

• The long double helix is organized into a compact structure by a conventional numbering system.

• The prime sym bol is used to distinguish carbons in sugar.

• The genome of mostbacteria is a single tion.
• The sugar carbons are divided into 1', 2', 3', 4', circular chromosomes, and the carbon atoms are numbered in a clockwise direction.

• The focus of the fifth car will be the first three levels of complexity.
• The 1' carbon atom has a base attached to it.
• There is a level 5 exam group attached at the 5' position.
• Compared with ribose.

• There is a missing oxygen atom at the 2' position in Figure 11.4.

• The next level of nucleic acid structure is the creation of a strand of sugars.

• In a linear manner, CH2 bonds to each other.

• The carbons in the sugar are given a special designation.

• The bases project from the back of the carbon atom strand.

• The orientation in a linear fashion is an important structural feature.
• There are cova nucleotides in aphosphodiester linkage.
• A sugar molecule in one of the two nucleotides is connected to the 5' carbon in one of the other.
• In a strand, the sugar molecule is oriented in the same and the next nucleotide is a phosphate group.
• Another way of looking at something.
• A strand has something on it.

• Chapter 11 3' is when going from top to bottom.
• The 3' end of a strand has an OH group, whereas the 5' end has a phosphate group.

• The cal feature of the bases in the genomes allows them to store and transmit information.

• Let's look at some of the key experiments.

• The discovery of the double helix was made using X-ray diffraction.
• If the substance has a 2-nanometer spacing between the strands, the pattern of scattering will respond to a purine bonding with a pyrimidine.

• The three-dimensional structure of the evidence that proved to be critical for the determination of the double molecule was given another piece of information.
• The studies of Austrian-born American bio in the same laboratory as Maurice Wilkins were used by British biophysicist Rosalind Franklin to create the helix structure.
• Chargaff analyzed the base com ist who made marked advances in X-ray diffraction techniques involving position of DNA that was isolated from many different species.

• The amount of adenine in a structure with a diameter that is relatively uniform and sample that is too wide to be a single-nucleotide was consistent with the results of the Franklin sug experiments.

• In the early 1950s, there was more information about the structure of the proteins than there was about the nucleic acids.
• Ameri X-rays diffracted by DNA can be used to create a structure known as an a helix.
• To determine the structure of the a helix, Pauling built large models by linking together atomic array in wet fibers.
• He could see if atoms fit together in a three-dimensional structure.
• Researchers use computers to construct three-dimensional models instead of using this approach.
• The structure of the double helix was solved using the ball-and-stick approach.

• We have considered the studies that led to the determination of the double helix.
• James Wat son and Francis Crick assumed that the chemical linkage between two nucleotides is always the same, as they worked together at Cambridge University.

• In collaboration with Wilkins, they set out to build models of the X-rays that incorporated all of the known experimental observations.

• Crick thought about several incorrect models.
• The bases were on the outside of the helix.
• The structure of the double helix was solved in another mental.

• The building revealed that the purine-purine pairs were too wide, and that the pyrimidine Nobel Prize is only awarded to living recipients.

• The ball-and-stick models showed that the two strands would form a double-stranded, double helix structure.

• In 1962, three men were awarded a prize for their work in chemistry and medicine.

• The specificity is a distinguishing feature of base pairs.

• A double helix is formed by two strands of DNA.

• The AT/GC rule states that the bases in opposite strands have the same end bond.

• The 2 strands are parallel.

• Each strand has 10 nucleotides in it.

• Draw a model for the base pair.