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Station #4: Comparative Biochemistry

Last updated almost 5 years ago
11 questions
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.
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 below.
1

Number of Amino Acid Differences Compared to Human Cytochrome C - Horse

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Chicken

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Tuna

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Frog

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Shark

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Turtle

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Monkey

1

Number of Amino Acid Differences Compared to Human Cytochrome C - Rabbit

1

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

1

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?

1

Big Question: How is biochemical evidence related to DNA evidence?