1.3 DNA is a double helix Figure 1.6 The double helix maintains a constant width because purines always face pyrimidines in the complementary A-T and G-C base pairs. The sequence in the H figure is T-A.C-G.A-T. 清菜大当
Figure 1.6 The double helix maintains a constant width because purines always face pyrimidines in the complementary A-T and G-C base pairs. The sequence in the figure is T-A, C-G, A-T, G-C. 1.3 DNA is a double helix
1.3 DNA is a double helix Figure 1.7 Flat base pairs lie perpendicular 3 to the sugar-phosphate backbone 清菜大当 Sucar Base Phosphate
Figure 1.7 Flat base pairs lie perpendicular to the sugar-phosphate backbone. 1.3 DNA is a double helix
1.3 DNA is a double helix Figure 1.8 The two strands of DNA form a double helix 清菜大当
Figure 1.8 The two strands of DNA form a double helix. 1.3 DNA is a double helix
1.4 DNA replication is semicon-servative DNA polymerases are enzymes that synthesize a daughter strand(s)of DNA (under direction from a DNA template).May be involved in repair or replication. DNAases are enzymes that attack bonds in DNA Endonucleases cleave bonds within a nucleic acid chain;they may be specific for RNA or for single-stranded or double- stranded DNA Exonucleases cleave nucleotides one at a time from the end of a polynucleotide chain;they may be specific for either the 5'or 3 end of dNa or rNa Parental strands of DNA are the two complementary strands of duplex DNA before replication 清菜大当
DNA polymerases are enzymes that synthesize a daughter strand(s) of DNA (under direction from a DNA template). May be involved in repair or replication. DNAases are enzymes that attack bonds in DNA. Endonucleases cleave bonds within a nucleic acid chain; they may be specific for RNA or for single-stranded or doublestranded DNA. Exonucleases cleave nucleotides one at a time from the end of a polynucleotide chain; they may be specific for either the 5′ or 3′ end of DNA or RNA. Parental strands of DNA are the two complementary strands of duplex DNA before replication. 1.4 DNA replication is semicon-servative
1.4 DNA replication is semicon-servative Replication fork is the point at which strands of parental duplex DNA are separated so that replication can proceed Ribonucleases are enzymes that degrade RNA Exo(ribo)nucleases work progressively.typically degrading one base at a time from the 3'end toward the 5'end Endo(ribo)nucleases make single cuts within the RNA chain RNA polymerases are enzymes that synthesize RNA using a DNA template (formally described as DNA-dependent RNA polymeras9es】 RNAases are enzymes that degrade RNA Semiconservative replication is accomplished by separation of the strands of a parental duplex,each then acting as a template for synthesis of a complementary strand 情菜大当
Replication fork is the point at which strands of parental duplex DNA are separated so that replication can proceed. Ribonucleases are enzymes that degrade RNA. Exo(ribo)nucleases work progressively, typically degrading one base at a time from the 3′ end toward the 5 ′ end. Endo(ribo)nucleases make single cuts within the RNA chain. RNA polymerases are enzymes that synthesize RNA using a DNA template (formally described as DNA-dependent RNA polymerases). RNAases are enzymes that degrade RNA. Semiconservative replication is accomplished by separation of the strands of a parental duplex, each then acting as a template for synthesis of a complementary strand. 1.4 DNA replication is semicon-servative