What Are the Chemical Structures and Functions of Nucleic Acids?
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1 THE NUCLEIC ACIDS
2 What Are the Chemical Structures and Functions of Nucleic Acids? Nucleic acids are polymers specialized for the storage, transmission, and use of genetic information. DNA = deoxyribonucleic acid RNA = ribonucleic acid
3 What Are the Chemical Structures and Functions of Nucleic Acids? Nucleotides Have Three Components Nucleotides are the monomers that make up nucleic acids. Nucleotides consist of a pentose sugar, a phosphate group, and a nitrogen-containing base. A nucleoside consists only of a pentose sugar and a nitrogenous base.
4 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? RNA contains the sugar ribose. DNA contains deoxyribose.
5 Linking Nucleotides Together Nucleotides are linked together in condensation reactions to form phosphodiester linkages. The phosphate groups link carbon 3 in one sugar to carbon 5 in another sugar. Nucleic acids are said to grow in the 5 -to-3 direction.
6 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? Oligonucleotides (about 20 monomers): RNA primers to start DNA duplication, RNA that regulates gene expression, etc. Polynucleotides, or nucleic acids (DNA and RNA): can be very long up to millions of monomers.
7 Nitrogen bases DNA bases: Adenine (A) Cytosine (C) Guanine (G) Thymine (T) RNA has uracil (U) instead of thymine.
8 Table 1.3
9 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? Complementary base pairing: purines pair with pyrimidines by hydrogen bonds.
10 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? RNA is single-stranded, but base pairing occurs between different regions of the molecule. Base pairing determines the three-dimensional shape of some RNA molecules. Complementary base pairing can also take place between RNA and DNA.
11 Figure 1.25 RNA
12 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? The two strands of a DNA molecule form a double helix. All DNA molecules have the same structure; diversity lies in the sequence of base pairs. DNA is an informational molecule: information is encoded in the sequences of bases.
13 Figure 1.26 DNA
14 DNA is a double-stranded helix, with the two strands connected by hydrogen bonds. Most DNA double helices are righthanded; The DNA double helix is anti-parallel, which means that the 5' end of one strand is paired with the 3' end of its complementary strand (and vice versa). Nucleotides are linked to each other by their phosphate groups, which bind the 3' end of one sugar to the 5' end of the next sugar. Not only are the DNA base pairs connected via hydrogen bonding, but the outer edges of the nitrogen-containing bases are exposed and available for potential hydrogen bonding as well. These hydrogen bonds provide easy access to the DNA for other molecules, including the proteins that play vital roles in the replication and expression of DNA
15 Base pairing in DNA. Two hydrogen bonds connect T to A; three hydrogen bonds connect G to C. The sugar-phosphate backbones (grey) run anti-parallel to each other, so that the 3 and 5 ends of the two strands are aligned.
16 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? DNA transmits information in two ways: DNA can reproduce itself (replication). DNA sequences can be copied into RNA (transcription). The RNA can specify a sequence of amino acids in a polypeptide (translation).
17 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? Transcription plus translation = expression
18 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? DNA replication and transcription depend on base pairing. DNA replication involves the entire molecule, but only relatively small sections of the DNA are transcribed into RNA.
19 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? The complete set of DNA in a living organism is called its genome. Not all the information is needed at all times; sequences of DNA that encode specific proteins are called genes.
20 Figure 1.27 DNA Replication and Transcription
21 1.5 What Are the Chemical Structures and Functions of Nucleic Acids? DNA carries hereditary information between generations. Determining the sequence of bases helps reveal evolutionary relationships. The closest living relative of humans is the chimpanzee.
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The actual process of assembling the proteins on the ribosome is called? translation The building blocks of proteins are? Complementary base pairing links Define and name the Purines amino acids nitrogen
DNA. translation. base pairing rules for DNA Replication. thymine. cytosine. amino acids. The building blocks of proteins are?
2 strands, has the 5-carbon sugar deoxyribose, and has the nitrogen base Thymine. The actual process of assembling the proteins on the ribosome is called? DNA translation Adenine pairs with Thymine, Thymine
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