February 08, 2016
Aim: How DNA controls traits?
Hw. Study for test tomorrow
1. Review
2. Proteins synthesis process
3. Explain homework project. Worth a quiz.
February 08, 2016
2. Protein synthesis process.
What in the DNA has "written the genetic
code?
http://www.wisc-online.com/Objects/ViewObject.aspx?ID=AP1302
Protein synthesis takes place in 3 steps:
1. Transcription:
The information on a gene is copied as mRNA
is synthesized in the nucleus using A DNA strand as template.
2. Translation :
The information (m)RNA is translated into a polypeptide chain
in the ribosomes. Enzymes coupled a sequence of 3 nucleotides
in the mRNA to the complementary sequence in the tRNA, which
brings in a corresponding amino acid.
Codon:
A sequence of 3 nucleotides in mRNA that has the code for
one of the 20 naturally occurring amino acids.
Anticodon:
A sequence of 3 nucleotides in tRNA complementary to
codon in mRNA
3. Protein folding:
Once translation has finished the polypeptide chain folds into a
mature protein in the cytoplasm.
February 08, 2016
Transfer RNA molecule
February 08, 2016
Practice using the genetic code
1st transcribe the sequence of gene (DNA)
into mRNA
2nd translate the codons in mRNA to the
corresponding amino acid. (use the chart)
3rd create the polypeptide chain