DNA Structure Note Guide

DNAD____________________ A____________ (DNA)Primary Function =

To ______________ and ________________ the genetic information that tells cells ________________ proteins to make and ________________ to make them.

DNA is . . .an ________________ compoundmade up of ________________ subunits called ________________composed of ________________ long ________________ of ________________

DNA nucleotide3 PARTS:

1. ________________ Molecule – ________________

2. ________________ Group – phosphorous(P) and oxygen (O)

3. ________________ Base – adenine(A), cytosine(C), guanine(G), and thymine(T)

Diagram of DNA

***Circle ONE nucleotide***

Nitrogen bases come in ________________ types:

1. P________________--Have ____________________________--And come in two types:

i. A________________ii. G________________

2. P________________--Have __________________________________ --And come in two types:

i. C________________ii. T________________

Note: Nucleotides can join in any order, so __________________________________ is possible

Complimentary B________________ P________________= Describes the pairing behavior of the bases.Certain bases _______________________ together

1. C________________ bonds with G________________ (C—G)2. A________________ bonds with T________________ (A—T)

NOTE: weak Hydrogen bonds form between them!!!Chargaff’s Rule: must be an equal number of ________________, ________________

Double helix structure of DNA --In 1953, James ________________ & Francis ________________ suggested a model for the ________________ of DNA: --They built a 3-D model of the double helix:

Two ________________ strands wrap around each other to form a double spiral (spiral ________________)

Rosalind ________________ used ___________________ to reveal X-shaped patter in DNA, suggesting DNA contained _____________ and _______________________________________

Structure of DNA Strand--______________________ form the center _______ of DNA--The outside, called the ______________________________________, is made of alternating _______________________ held together by covalent bonds