RNA and Transcription
RNA

Ribonucleic Acid

another type of nucleic acid found in cells
o also made of nucleotides

takes information from the nucleus to the rest of the cell
DNA-RNA
DNA
RNA
deoxyribose
ribose
adenine, cytosine, guanine
adenine, cytosine, guanine
thymine
uracil
Strands
double (2)
single (1)
Found
nucleus
nucleus and
cytoplasm
Comparison
Sugar
Chart
Bases
No thymine in
RNA
Transcription  process in which part of the nucleotide sequence of DNA is
copied into a complementary sequence in RNA
o synthesis of RNA

during transcription, RNA polymerase binds to DNA at a
promoter (start) site unzipping the DNA double strand
RNA

enzyme that produces RNA
polymerase

uses one of the DNA strands as a template from which RNA
nucleotides are assembled to make mRNA
o mRNA = messenger RNA
RNA Editing

before the mRNA can leave the nucleus it has to be edited

it receives a cap and a tail

introns are cut out and exons spliced together.
Intron

sequence of DNA that is NOT involved in coding for a protein
Exon

expressed sequence of DNA that codes for a protein
Name the 3

3 types of RNA
types of RNA
o mRNA = messenger RNA

carries message from DNA in the nucleus into
cytoplasm where ribosomes are located
o tRNA = transfer RNA

connects amino acids to protein chain
o rRNA = ribosomal RNA

makes up a portion of a ribosome
Summary:
Transcribe the parent DNA strand on the left into a single stranded piece of mRNA.
DNA
T
A
C
G
C
T
A
A
C
T
G
A
G
T
G
A
C
T
A
T
G
C
G
A
T
T
G
A
C
T
C
A
C
T
G
A
mRNA
A
U
G
C
G
A
U
U
G
A
C
U
C
A
C
U
G
A