RHS SCIENCE TAKS REVIEW

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Presentation transcript:

RHS SCIENCE TAKS REVIEW DNA Animation factory

All cells contain chromosomes Chromosomes are made of DNA DNA contains the code for life All cells contain Chromosomes Chromosomes are made of DNA Sections of DNA which code for genetic information are called genes http://www.paternityexperts.com/images/DNA-of-life.jpg

DNA is made up of a series of monomers called NUCLEOTIDES

Each nucleotide has 3 parts A sugar called deoxyribose A phosphate molecule A nitrogenous base

Two kinds of bases The purines Have 2 rings in their structure Include adenine guanine http://www.cat.cc.md.us/courses/bio141/lecguide/unit4/genetics/DNA/RNA/images/u4fg10a.jpg

Two kinds of bases The pyrimidines Have 1 ring Include cytosine thymine thymine C H4 http://www.cat.cc.md.us/courses/bio141/lecguide/unit4/genetics/DNA/RNA/images/u4fg10a.jpg

The backbone of the DNA chain is formed by the Sugar Phosphate http://nanopedia.cwru.edu/image/DNA%20structure.jpg

The “rungs” of the ladder are made of bases A - T G - C http://nanopedia.cwru.edu/image/DNA%20structure.jpg The bases are held together by hydrogen bonds

The 2 DNA chains are joined together forming a http://nanopedia.cwru.edu/image/DNA%20structure.jpg Double helix

SELF TEST What two parts are the same in all nucleotides? Which two bases are purines? What holds the double helix together? Sugar and phosphate

BYE . . . .