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CHAPTER
13
GENES AND CHROMOSOMES
Section 13.2 From DNA to Protein
Study the Diagram
The mRNA strand shown below is in the process of synthesizing—making—proteins from amino
acids. tRNA molecules bring the amino acids to the mRNA strand. Circle the tRNA molecule that
will attach to the mRNA strand. Remember, cytosine (C) pairs with guanine (G), and adenine (A)
pairs with uracil (U).
AA
AA
tRNA
U
G
C
A
C
C
G
U
A
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mRNA
Now look at the diagram again and answer the questions.
1. How did you know which tRNA molecule would attach to the mRNA strand?
The base pairs matched.
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2. Suppose one of the bases on the mRNA was changed. Would the same tRNA molecule still
attach to the strand? Explain your answer.
No. If one of the bases on the mRNA strand was changed, it would not match
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the bases on the same tRNA molecule, so that molecule would not attach.
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BIOLOGY: The Dynamics of Life CHAPTER 13
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