Examine the following table. It compares corresponding portions of part of a hemoglobin molecule in humans and five other vertebrates. Hemoglobin is a protein containing two different polypeptide chains. In adult hemoglobin, these are alpha globin and beta globin. The table shows a portion of the beta globin chain, which in total has 146 amino acids. a.Use the table and identify which organism has the most amino acids in common with humans. What does this indicate? b.Which organism appears to have the most differences in the amino acid sequence from humans? What does this indicate? c. Compare the amino acids at position 116 for human and the red kangaroo. Using the genetic code given in the appendix (page 5) suggest one base sequence in the mRNA that would produce these amino acids. d.Is there more than one sequence possible? Why?

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