Solved by a verified expert:Part 1: DNA Structure and Replication
Go to the following website: http://www.dnaftb.org/19/
Read the concept tab, watch the animation under the
animation tab, and watch the videos under the video tab. Then answer the
following questions:
1. What type
of technology helped to show that DNA was shaped like a twisted ladder?
2. What part
of the molecule forms the rungs of the ladder?
3. What part
of the molecule forms the sides of the ladder?
4. From the
PROBLEM section: How can you illustrate the structure of DNA as a right-handed
double helix?
Next, go to the following website: http://www.dnaftb.org/20/
Read the concept tab, watch the animation under the
animation tab, and watch the videos under the video tab. Then answer the
following questions:
1. How did
the discovery of the enzyme DNA polymerase play in the understanding for the
process of DNA replication?
2. What is
the difference between the conserved strand of DNA and the complementary
strand?
3. From the
PROBLEM section: Meselson and Stahl showed that DNA replication is
semi-conservative. What would the contents of tubes 1-4 look like to illustrate
this finding?
Part 2: Transcription and Translation
Go to the following website:
http://sepuplhs.org/high/sgi/teachers/genetics_act16_sim.html
Read each screen and click “continue” when you are ready to
proceed.
1. Where in the cell does transcription take place?
2. For each DNA nucleotide (listed first), identify the
complementary RNA nucleotide.
a. Adenine base
pairs with ___________________________
b. Guanine base
pairs with ___________________________
c. Cytosine base
pairs with ___________________________
d. Thymine base
pairs with __________________________
3. What enzyme is used to link RNA nucleotides to each other
during transcription?
4. Which type of RNA is formed and where in the cell does it
go?
• At this
point, you will be prompted to complete “student sheet 16.1” – ignore that, but
do make sure you have been able to answer questions 1-4 above. Click “continue”
when you are ready to proceed to translation.
5. Where in the
cell does translation occur?
6. Which molecule
serves as the template for translation?
7. What are the
triplets of nucleotides on the molecule from question 6 called?
8. What are the
complementary triplets of nucleotides on transfer RNA called?
• At this
point, you will drag and drop the correct transfer RNA molecules to build a
protein, as indicated in the instructions on the website. For question 9, be
sure to record the amino acids as you add them, because the whole sequence will
not be visible at the end of the activity.
9. Record the
sequence of amino acids as you add them to build the protein. Make sure you are
writing down the three letter abbreviations for the amino acids, not the codons
or anti- codons!
10. What happened to the chain of amino acids after it was
completed?
11. What determines the shape and function of the protein?
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