Transcription

Define the following

Messenger RNA Ribosomal RNA Transfer RNA Transcription Codon

Morse Code

Genes and Proteins

Read on pg. 294 what role proteins play

How does DNA factor in?

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”

Three types of RNA

Messenger RNA (mRNA)

Ribosomal RNA (rRNA)

Transfer RNA (tRNA)

Messenger RNA (mRNA)

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

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

Transfer RNA (tRNA)

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

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

Transcription cont…

AGC TAA CCG

UCG AUU GGC

GACAAGTCCACAATC

CUGUUCAGGUGUUAG

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

Amino Acids

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