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Lecture 15

BIO SCI 93 Lecture Notes - Lecture 15: Start Codon, Complementary Dna, Tata Box


Department
Biological Sciences
Course Code
BIO SCI 93
Professor
Diane O' Dowd
Lecture
15

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Lesson 15 Reading guide
Bio Sci 93 Fall 2014
Reading guide for lesson 15 (pages 336 – 351, 354 – 357)
Complete this reading guide as you read the textbook pages listed above. You might not have to
read every word on every page, rather pay close attention to the questions in this guide and
answer them as you work through the textbook. Also pay close attention to the terms that are
underlined: these are key terms that you should know the definitions of and be able to apply in
new situations.
Start at “basic principles of transcription and translation” on page 336.
What does gene expression mean?
What are the differences between DNA and RNA (refer back to pages 84 to 87 if you want more
details)
Briefly describe how transcription results in the production of messenger RNA (mRNA).
Briefly describe how translation results in the production of proteins.
Summarize the flow of information from DNA to RNA to protein with a simple drawing. See
Figure 17.3 for an example.
Describe how the triplet code and codons are used to produce proteins starting from the
template strand of DNA. See Figure 17.4 for a visual of this process.
Why is the mRNA molecule complementary to the DNA template strand and not identical?
A template strand of DNA has the sequence 3’AGCGTA – 5’. Using what you read on page
338, what is the noncoding or complementary DNA sequence and what is the mRNA sequence?
Make sure to indicate which ends are the 5’ and 3’ ends. How many codons are in the mRNA
sequence?
What direction does translation “read” the mRNA sequence to produce proteins? What does
each codon “code” for?
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