DNA Structure and Function - Oregon High School

DNA Structure and Function - Oregon High School

DNA Structure and Function What is DNA and why is this molecule important? A. DNA Deoxyribonucleic Acid B. Codes for our traits

Why is the structure of DNA important? Structure must be able to be: 1.A blueprint for our traits 2.Easily copied

What does DNA look like? What does DNA look like? 1953 James Watson and Francis Crick discovered structure of DNA;

later won Nobel Prize What does DNA look like? -Twisted ladder or Spiral Staircase - Double helix - 2 connected strands

wrapped around each other What is DNA made of? A. Sugar Deoxyribose B. Phosphate

C. Base Sugar + phosphate + base = 1 nucleotide Four different nucleotides 1. Deoxyribose 2. Phosphate 3. Base - Adenine

1. Deoxyribose 2. Phosphate 3. Base - Thymine 1. Deoxyribose 2. Phosphate 3. Base - Cytosine

1. Deoxyribose 2. Phosphate 3. Base - Guanine DNA is shaped like a ladder RAILS

RAILS RUNGS DNA is shaped like a ladder Nucleotides are connected so: -Rails are alternating

sugar - phosphate -Bases are pointed to center DNA is shaped like a ladder DNA is made of: -Two strands -Strands connect at

bases Basepair rules - Adenine always connects with Thymine -Cytosine always connects with Guanine

Code of Life - Order of bases spells out a code for your traits. -Sequences of DNA which code for a trait are called genes. -Change the order of the bases (mutation) and

you may have a new trait. DNA Structure Summary Video click here Fun DNA Facts -DNA is 1/10th width

of human hair, but DNA in each cell is 6 feet long (over 3 billion nucleotides)! -If all DNA from one person were connected end to end, it would stretch

from the Earth to the Sun 4 times! Fun DNA Facts -Every persons DNA sequence is unique (forensics, paternity tests).

-BUT . . . sequence is 99.8% IDENTICAL to any other person! -Humans and Mice 85% identical -Humans and Bananas 50% identical

Fun DNA Facts -Why is the DNA sequence of every living thing have almost the same DNA sequence? -All are made of cells

-Cell division -Making nutrients Fun DNA Facts -Only 2% of our DNA codes for genes. Rest is . . . junk DNA that may come from viruses!

Review Animations DNA structure review Base pair review DNA structure review #2

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