Download Answer keyDNA Practice problems

DNA Practice problems-Answer Key
1.
If you have a strand of DNA with the following sequence,
3’ G T T A C A A T A G C G T G G C A C C T A C T T G 5’
a.
What is the complementary strand of DNA?
3’ G T T A C A A U A G C G T G G C A C C T A C T T G 5’
5’C A A T G T T A T C G C A C C G T G G A T G A A C 3’
b.
If this DNA is transcribed, what is the mRNA?
5’C A A U G U U A U C G C A C C G U G G U U G A A C3’
c.
If the mRNA is translated, what is the order of amino acids found in
this mRNA to code for a protein?
5’C A A U G -U U A- U C G- C A C- C G U -G G U -U G A- A C3’
start-leu-ser-his-arg-gly-stop
2.
What enzyme is responsible for building a complementary strand of DNA?
DNA polymerase
Which direction does it build a new strand?
5 ‘ to 3’
3.
If you were to replicate the above strand of DNA in this direction ----, from
left to right, which of the parent stands is used to build the leading strand of
DNA? The lagging strand???
Here is a model for the above DNA strands:
3’-------------------------------5’----this is the parent strand which is used to build
the leading stand
5’-------------------------------3’----this is the parent strand which is used to build
the lagging strand