DNA and Genes - DNA and Genes Structure of DNA- DNA is a...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: DNA and Genes Structure of DNA- DNA is a polymer made up of repeating subunits called nucleotides.- 3 parts to a nucleotide: sugar, nitrogen base, and a phosphate group. - The sugar in DNA is called deoxyribose - In DNA, there are 4 possible nitrogen bases: adenine (A), guanine (G), cytosine (C), and thymine (T) - Nucleotides join to form long chains- The phosphate group of one nucleotide bonds to the deoxyribose sugar of an adjacent nucleotide. - The phosphates and sugars form the backbone, and the nitrogen bases stick out like teeth on a zipper. Watson and Crick- In 1953, they proposed that DNA is made up of two chains of nucleotides joined together by the nitrogen bases (hydrogen bonds).- The two strands are complementary to each other- the bases on one strand determine the bases on the other. - Complementary base pairing: adenine always pairs with thymine; guanine always pairs with cytosine DNAs shape is called a double helix- composed of two strands twisted together Importance of Sequences- All organisms contain DNA made up of the same four nucleotides- Organisms differences result from the sequence of the 4 different nucleotides along the DNA strands- The closer the relationship between two organisms, the greater similarity in their order of DNA nucleotides - Sequences used to determine evolutionary relationships or if two people are related DNA Replication : the process by which the DNA in the chromosomes is copied; VERY important step in mitosis and meiosis Steps to DNA Replication...
View Full Document

This note was uploaded on 04/05/2011 for the course BIOL 2112 taught by Professor Deidra during the Spring '11 term at CSU Sacramento.

Page1 / 30

DNA and Genes - DNA and Genes Structure of DNA- DNA is a...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online