Transcript DNA: The Code of Life

DNA: The Code of Life
Why are lobsters blue?
https://www.youtube.com/watch?
v=e2n1cwAXbaY
DNA
• Because there are so many possible
combinations of bases and genes, each
individual organism has a unique set of DNA.
• DNA can be found in all of the cells of your
body except for red blood cells!
DNA contains the genetic information for cells
to make proteins. Proteins determine a
variety of traits, from hair color to an
organism’s ability to digest food.
It took almost 100 years after the
discovery of DNA for scientists to figure
out that it looks like a twisted ladder.
r.
Order of the bases
http://www.youtube.com/watch?v
=0_b80fHmuWw
http://learn.genetics.utah.edu/con
tent/begin/dna/builddna/
http://www.zerobio.com/drag_gr9
/DNA/dna.htm
DNA Marshmallow lab
Today you are making a DNA model
using white and colored
marshmallows, cheerios and spaghetti!
http://dj003.k12.sd.us/science%20labs
/DNA%20marshmallow%20lab/dna_m
arshmallow_lab_name.htm
Part 2 marshmallow lab
Replication
• DNA REPLICATION –
• occurs in the nucleus of a cell.
is the process in which and identical copy of
a DNA STRAND IS FORMED FOR A NEW CELL
• It ensures that each daughter cell will have all
of the genetic information it needs to carry
out its activities.
RNA is different from DNA
RNA
DNA
single stranded
double stranded
found in the cytoplasm and the nucleus
only found in the nucleus
has ribose as a sugar
has deoxyribose as a sugar
has nucleotides adenine, uracil replaces
thymine, cytosine, and guanine
has nucleotides adenine, thymine,
cytosine, and guanine
There are two kinds of RNA
•
1.MESSENGER RIBONUCLEIC ACID
(mRNA)copies the coded message from the DNA in the
nucleus
mRNA will copy adenine with uracil instead of
thymine
mRNA carries the transcription message off the
DNA into the cytoplasm,
mRNA attaches to a ribosome
•
2.TRANSFER RNA
(tRNA)carries amino acids coded for with three
nucleotides
the amino acids then are add to the growing
protein.
• http://www.stolaf.edu/people/giannini/flasha
nimat/molgenetics/dna-rna2.swf