Transcription 1. Gene Expression

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Presentation transcript:

Transcription 1. Gene Expression 1a. All of our traits (height, eye color, and all other inherited traits) result from the activity of proteins.

Transcription 1b. Proteins are made of amino acids linked together. 1. Gene Expression 1b. Proteins are made of amino acids linked together.

Transcription 1. Gene Expression 1c. The recipe for each kind of amino acid needed for protein manufacturing is located in the DNA

Transcription 1. Gene Expression 1d. The information encoded within DNA must travel out of the nucleus and into the cell where the message gets expressed as a protein. 1e. This happens in 2 steps: (1) Transcription (2)Translation

Transcription 2. Transcription 2a. Transcription is the process by which part of the DNA molecule is read and copied into a molecule called ribonucleic acid (RNA).

Transcription 2b. Why do cells use RNA? DNA is far too long and important to be sent out of the cell every time a protein must be made. So the cell creates short disposable RNA molecules to carry copies of DNA’s instructions.

Transcription DNA RNA 2c. DNA vs. RNA 2. Transcription Double Stranded Single Stranded Long Short Stationary Mobile Uses Thymine Uses Uracil Contains deoxyribose Contains ribose

Transcription 2. Transcription Step 1 An enzyme called RNA polymerase temporarily separates the strands of a small section of DNA molecule This exposes some of the bases of the DNA molecule.

Transcription 2. Transcription Step 2 Along one strand, the RNA polymerase binds the complementary RNA nucleotides to the exposed DNA bases. Instead of Thymine (T) RNA uses uracil (U)

Transcription 2. Transcription Step 3 As the RNA polymerase moves it creates a new strand of RNA Specifically messenger RNA (mRNA) It is called messenger RNA because it carries DNA’s instructions out of the nucleus.

Transcription 2. Transcription Step 4 When RNA polymerase is done reading the gene on the DNA, it detaches Step 5 The separated DNA strands reconnect and the mRNA moves to the cytplasm.

links https://www.youtube.com/watch?v=NJxobgkPEAo https://www.youtube.com/watch?v=41_Ne5mS2ls

Assignment: Homework: Transcription worksheet AGENDA 1/14/13 Assignment: Transcription worksheet Homework: Gene Expression Reading (continued…)