Chapter 14
DNA Structure and Function
By Boundless
![Thumbnail](../../../../../figures.boundless-cdn.com/30574/square/dna structures.jpg)
DNA is a double helix of two anti-parallel, complementary strands having a phosphate-sugar backbone with nitrogenous bases stacked inside.
![Thumbnail](../../../../../figures.boundless-cdn.com/18960/square/figure-14-02-04ab.jpeg)
DNA sequencing techniques are used to determine the order of nucleotides (A,T,C,G) in a DNA molecule.
![Thumbnail](../../../../../figures.boundless-cdn.com/20205/square/figure-14-03-02.jpeg)
DNA replication uses a semi-conservative method that results in a double-stranded DNA with one parental strand and a new daughter strand.
![Thumbnail](../../../../../figures.boundless-cdn.com/31344/raw/dna-replication-en.jpg)
Prokaryotic DNA is replicated by DNA polymerase III in the 5' to 3' direction at a rate of 1000 nucleotides per second.
![Thumbnail](../../../../../figures.boundless-cdn.com/20188/square/figure-09-02-03.jpg)
DNA replication in eukaryotes occurs in three stages: initiation, elongation, and termination, which are aided by several enzymes.
![Thumbnail](../../../../../figures.boundless-cdn.com/29901/square/telomeres end problem.jpg)
As DNA polymerase alone cannot replicate the ends of chromosomes, telomerase aids in their replication and prevents chromosome degradation.