Keratin is a protein that is found in our hair and nails. It provides the tough structure that makes our skin a and nails hard and durable. Keratin is coded for by genes. Genes are segements of DNA. DNA and all of its genes, including Keratin, are stored safely and neatly in molecules called _________________________. We have 46 of these (23 from our mom and 23 from our dad).
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Question 2
2.
Below are the steps of protein synthesis. Explain the role of mRNA in protein synthesis, in as much detail as possible.
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Question 3
3.
A segment of DNA is shown below. It codes for SWS opsin protein that absorbs wavelengths of light in the blue range. It sits in the membrane of blue or SWS cone cells and communicates the sight of blue and some other colors to the brain. Using the information below:
1. Transcribe the DNA segment that codes for the SWS opsin protein, to make an mRNA transcript.
Coding strand: ATC CCG TAC CAC GGG CTT
**Template strand: TAG GGC ATG GTG CCC GAA
2. Use the mRNA transcript you create, and the selection of tRNA molecules below, to determine the order of amino acids in the SWS opsin protein.
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Question 4
4.
The MWS opsin protein and LWS opsin protein both have similar jobs, communicating the sense of color to the brain. The reason for their differening functions is because of their slightly different sequences of amino acids as shown below. Use specific evidence from the chart to explain how a difference in just one base pair can code for a different protein, with a different function.