DNA goes through transcription in the nucleus to produce RNA. RNA then goes
through translation and leaves the nucleus and goes into the cytoplasm in the
form of a protein.
Transcription: the synthesis of RNA under the direction of DNA, and
translation or the transfer of information from DNA to RNA
Translation: the synthesis of protein under the direction of RNA or the use of
information in RNA to make a polypeptide
What
is the relationship between codons
and
amino acids?
Codons are a set of
three
nucleotides in RNA that code for
amino acids.. Codons: the genetic
instructions for the amino acid
sequence of a polypeptide chain
are
written in DNA and RNA as a
series of nonoverlapping three-
base
words
74

11. What does amino acid is coded by
the mRNA sequence CAU?
Hist
What is the codon(s) for
the amino acid valine
(Val)?
GUG, GUA GUC,
GUU
12. In a few sentences that are your own,
describe the process of
transcription
.
Be sure to explain where it occurs in
the eukaryotic cell, how it starts, what
the enzyme does, and how it ends. Be
sure to include these terms in your
description:
RNA polymerase, template strand, promoter,
RNA nucleotides, terminator, and pre-RNA
transcript.
Transcription is the transfer of genetic
information from DNA to RNA.
Prokaryotic transcription occurs
in the
cytoplasm alongside translation.
In
eukaryotic cells, DNA is located inside
the nucleus so the processes are separated
both in location and time. Replication
and
transcription occur
in the nucleus,
while translation
occurs
in the
cytoplasm. The promoter is the binding site for RNA
polymerase, this marks the start of the gene. After the separation of the two DNA
strands, one strand serves as a template for a new RNA molecule; the other DNA strand
is unused. The transcription enzyme RNA polymerase moves along the gene, opening up
the double helix and starts to synthesize RNA - forming a new RNA strand by following
the base rules but remember in RNA U replaces T.
A template strand is the term that
refers to the strand used by RNA polymerase to attach complementary bases during
RNA transcription A specific nucleotide sequence called a promoter acts as a binding site
for RNA polymerase and determines where transcription starts. RNA polymerase adds
RNA nucleotides until it reaches a sequence of DNA bases called the terminator, which
signals the end of the gene.
75

15. How is
transcription
different from
DNA replication?
Transcription and
DNA replication
both involve
making copies of
the DNA in a cell.
Transcription
copies the DNA
into RNA, while
replication makes
another copy of
DNA.
DNA Replication
________________________________
Transcription
Template(s)?
A
template
strand is the term that refers
to the strand used by
DNA polymerase
or RNA
polymerase
to attach complementary
bases during
DNA replication
Enzyme?
DNA Polymerase
RNA Polymerase
Nucleotides incorporated?
A-T, G-C
A-U, G-C
End result?
2 Strands of DNA
RNA
16. What are the difference between a pre-mRNA and a mature mRNA?
For example,
(pre-mRNA) becomes a messenger RNA (mRNA) after
processing
.
The first
transcript from a protein coding gene is called a
pre-mRNA


You've reached the end of your free preview.
Want to read all 109 pages?
- Spring '16
- Daniels, J