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Laabri

Station #4: Comparative Biochemistry1

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10 Nsɛmmisa

Cytochrome C is a protein found in mitochondria. It is used in the study of evolutionary relationships because most animals have this protein. Cytochrome C is made of 104 amino acids joined together. Below is a list of amino acids in part of a cytochrome protein molecule for 9 different animals. Any sequences exactly the same for all animals have been skipped.

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10.

Do any of the organisms have the same number of differences from human Cytochrome C? In situations like this, how would you decide which is more closely related to humans?

For each non-human animal, count any amino acids that are different than the human's sequence. When you finish, record how many differences you found in the questions to the right.

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1.

Count the Number of Amino Acid Differences of the Human to the Horse

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2.

Count the Number of Amino Acid Differences of the Human to the Chicken

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9.

Based on Cytochrome C data, which organism is most closely related to humans?

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3.

Count the Number of Amino Acid Differences of the Human to the Tuna

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4.

Count the Number of Amino Acid Differences of the Human to the Frog

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5.

Count the Number of Amino Acid Differences of the Human to the Shark

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6.

Count the Number of Amino Acid Differences of the Human to the Turtle

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7.

Count the Number of Amino Acid Differences of the Human to the Monkey

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8.

Count the Number of Amino Acid Differences of the Human to the Rabbit