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Transcription

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Define the following

Messenger RNA Ribosomal RNA Transfer RNA Transcription Codon

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Morse Code

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Genes and Proteins

Read on pg. 294 what role proteins play

How does DNA factor in?

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RNA 3 chemical differences between DNA

and RNA 1. Single strand 2. Sugar in RNA is ribose 3. Uracil (U) instead of thymine (T) “U R single”

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Three types of RNA

Messenger RNA (mRNA)

Ribosomal RNA (rRNA)

Transfer RNA (tRNA)

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Messenger RNA (mRNA)

RNA that transports information from DNA in the nucleus to the cell's cytoplasm

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Ribosomal RNA (rRNA)

RNA that makes up the ribosomes; Clamps onto mRNA and Uses it’s information to assemble

amino acids in the correct order

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Transfer RNA (tRNA)

RNA that transports amino acids to the ribosomes to be assembled into proteins

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Transcription

Process in the cell nucleus where enzymes make an RNA copy of a DNA strand

1. Enzymes unzip the molecule of DNA 2. RNA nucleotides pair with

complementary DNA nucleotides on a DNA strand

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Transcription cont…

AGC TAA CCG

UCG AUU GGC

GACAAGTCCACAATC

CUGUUCAGGUGUUAG

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Transcription cont…

3. mRNA molecule breaks away as the DNA strands rejoin

mRNA leaves the nucleus and enters the cytoplasm

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Page 297

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Page 297

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Amino Acids

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The Genetic Code

4 nitrogen bases make up 20 amino acids (64 combos)

This is the genetic code Separated into codons Set of three nitrogen bases that

codes for an amino acid


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