A Scientist Isolates a Previously Undiscovered Protein from a Fruit

question 219

Multiple Choice

A scientist isolates a previously undiscovered protein from a fruit fly and determines the sequence of amino acids making up the protein.Upon comparing the sequence to a database, he finds another protein isolated from a lizard with the same sequence.The lizard protein is known to be involved in glucose metabolism.The scientist predicts that the fruit fly protein must also be involved in glucose metabolism.How can his prediction be justified?

• A) Two proteins isolated from modern terrestrial animals such as fruit flies and lizards should be closely related, which implies that the two molecules will function in the same way.
• B) Two proteins with the same distribution of amino acids have the same size, which allows the two molecules to function in the same way.
• C) Two proteins made up of the same number and types of amino acids have the same composition, which allows the two molecules to function in the same way.
• D) Two proteins with the same amino acid composition have the same mass, which allows the two molecules to function in the same way.
• E) Two proteins with the same amino acid sequence have the same structure, which allows the two molecules to function in the same way.

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