slide1
Download
Skip this Video
Download Presentation
DNA RNA Protein Trait Protein Synthesis (Gene Expression) Notes

Loading in 2 Seconds...

play fullscreen
1 / 24

DNA RNA Protein Trait Protein Synthesis (Gene Expression) Notes - PowerPoint PPT Presentation


  • 143 Views
  • Uploaded on

DNA RNA Protein Trait Protein Synthesis (Gene Expression) Notes Proteins (Review) Proteins make up all living materials. Proteins are composed of amino acids – there are 20 different amino acids

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 ' DNA RNA Protein Trait Protein Synthesis (Gene Expression) Notes' - bozica


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
slide1

DNA RNA Protein Trait

Protein Synthesis (Gene Expression) Notes

Proteins (Review)

  • Proteins make up all living materials
slide2

Proteins are composed of amino acids – there are 20different amino acids

  • Different proteins are made by combiningthese 20 amino acids in different combinations
slide4

Function of proteins:

  • Help fight disease
  • Build new body tissue
  • 3.Enzymes used for digestion and other chemical reactions are proteins

(Enzymes speed up the rate of a reaction)

  • 4. Component of all cell membranes
slide5

Genes

  • Genes are the instruction manuals for our bodies.
  • They are the directions for building all the proteins that make our body function.
  • Genes are made of DNA.
slide6

Gene Expression

  • Not all genes are active or expressed at the same time.
  • Why: Because the cell would produce molecules it did NOT need – waste of energy and raw materials
slide7

Gene expression (protein synthesis) is when the product of a gene, or a specific protein is being produced by a cell.

    • some genes are – rarelyexpressed – adrenaline
    • some genes are – constantly expressed – hairgrowth, blood pressure
    • some genes are expressed sometimes and turned off others – estrogen.
slide8

Making a Protein—Transcription

  • First Step:Copying of genetic information from DNA to RNA called Transcription

Why? DNA has the genetic code for the protein that needs to be made, but proteins are made by the ribosomes—ribosomes are outside the nucleus in the cytoplasm.

DNA is too large to leave the nucleus (double stranded), but RNA can leave the nucleus (single stranded).

slide10

Part of DNA temporarily unzips and is used as a template to assemble complementary nucleotides into messenger RNA (mRNA).

slide11

Nucleus

mRNA

DNA

DNA

A

U

A

T

U

A

G

C

C

slide13

Nucleus

Original DNA

mRNA

Ribosome

slide14

Making a Protein—Translation

  • Second Step:Decoding of mRNA into a protein is called Translation.
  • Transfer RNA (tRNA) carries amino acids from the cytoplasm to the ribosome.
slide15

These amino acids come from the food we eat. Proteins we eat are broken down into individual amino acids and then simply rearranged into new proteins according to the needs and directions of our DNA.

slide16

A series of three adjacent bases in an mRNA molecule codes for a specific amino acid—called a codon.

  • A triplet of nucleotides in tRNA that is complementary to the codon in mRNA—called an anticodon.
  • Each tRNA codes for a different amino acid.

mRNA

Amino acid

tRNA

Anticodon

slide19

Use one of the codon charts on the next page to find the amino acid sequence coded for by the following mRNA strands.

CAC/CCA/UGG/UGA

___________/___________/___________/____________

AUG/AAC/GAC/UAA

  • ___________/___________/___________/____________
slide20

2nd Base

1st Base

3rd Base

  • CAC/CCA/UGG/UGA
  • ___________/___________/___________/____________

Histidine

Proline

Tryptophan

Stop

slide21

AUG/AAC/GAC/UAA

  • ___________/___________/___________/____________

Methionine

Asparagine

Aspartic Acid

Stop

ad