Molecular genetics
Download
1 / 27

Molecular Genetics - PowerPoint PPT Presentation


  • 75 Views
  • Uploaded on

Molecular Genetics. http://www.emc.maricopa.edu/faculty/farabee/BIOBK/code.gif. INFORMATION CONTENT IN BITS I = X LOG 2 N FROM SHANNON WHERE X IS # CHARACTERS IN MESSAGE

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Molecular Genetics' - druce


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


INFORMATION CONTENT

IN BITS

I = X LOG2N FROM SHANNON

WHERE X IS # CHARACTERS IN MESSAGE

N IS LETTERS IN ALPHABET, ASSUMING THEY ARE EQUALLY LIKELY (PRETTY GOOD ASSUMPTION FOR DNA BASES, NOT SO GOOD FOR AA)


VIRUSES HAVE VERY SMALL GENOMES

REPRODUCE ONLY IN HOTS CELL

CODE FOR COAT PROTEINS AND ENZMES NEEDED FOR VIRAL LIFE CYCLE

HIJECKS CELL METABOLISM AND PROTEIN SYNTHESIS MACHINERY


CAPSOMERES

CAN BE SURROUNDED BY A MEMBRANOUS ENVELOPE (FLU)


Transposable elements and jumping genes

Simplest elements are insertion sequences (prokaryotes only). Contains a gene coding for an enzyme which moves the sequence and is flanked by inverted repeats


Inverted repeats allow the formation of stem-loop stuctures. Loops can be very large, containing whole genes! This is a common theme in nucleic acid processing- remember palindromes, tRNA, etc.

Two insertion sequences flaning a coding region make the whole region portable. We have evolved to evolve.


Carbon Loops can be very large, containing whole genes! This is a common theme in nucleic acid processing- remember palindromes, tRNA, etc.

Atomic mass ~12.1

Atomic number 6

Most versatile chemistry of any element

Sixth most abundant element in the universe

(see atomic number)


ad