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RNA

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Title: RNA


1
RNA
2
Learning Objectives
  • Contrast RNA and DNA.
  • Explain the process of transcription.

3
Comparing RNA and DNA
  • The sugar in RNA is ribose instead of
    deoxyribose.
  • RNA is generally single stranded, not double
    stranded.
  • RNA contains uracil in place of thymine.

4
The Role of RNA
  • The roles played by DNA and RNA molecules in
    directing protein production are like the two
    types of plans builders use
  • A master plan
  • A blueprint

5
Types of RNA
  • The three main types of RNA are

Transfer RNA
Ribosomal RNA
Messenger RNA
6
Messenger RNA
  • An mRNA molecule is a copy of the portion of DNA
    that will be used to make a protein.
  • After being made in the nucleus, mRNA travels to
    the cytoplasm, the site of protein synthesis.

7
Ribosomal RNA
  • Protein synthesis occurs on ribosomes, which are
    made up of two subunits.
  • Both subunits consist of several molecules of
    ribosomal RNA (rRNA).

8
Transfer RNA
  • During protein synthesis, transfer RNA molecules
    (tRNA) carry amino acids from the cytoplasm to
    the mRNA.

9
RNA Synthesis Transcription
  • In transcription, segments of DNA serve as
    templates to produce complementary mRNA molecules.

10
RNA Synthesis Promoters
  • RNA polymerase binds only to regions of DNA that
    have specific base sequences. These regions are
    called promoters.

G
C
T
A
A
U
11
RNA Synthesis RNA Editing
  • New RNA molecules sometimes require a bit of
    editing before they are ready to be read.

Exons
Introns
Cap
Tail
12
Student Worksheet Answers
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