In this exercise, you will compare the amino acid sequence from the aphid to the

Question

In this exercise, you will compare the amino acid sequence from the aphid to the amino acid sequences of the other species to identify how similar they are. As a first step, you will compare the aphid sequence (Acyrthosiphon) to a bacterial sequence (Pantoea).

The sequences below show the first 60 amino acids of one polypeptide, using the one-letter abbreviations for the amino acids. An underscore (_) indicates a gap inserted in a sequence to optimize its alignment with the corresponding sequence in Arabidopsis.

At how many positions are the amino acids the same between the two species?

Acyrthosiphon (aphid) IKIIIIGSGV GGTAAAARLS KKGFQVEVYE KNSYNGGRCS IIR_HNGHRF DQGPSL__YL Pantoea (bacterium) KRTFVIGAGF GGLALAIRLQ AAGIATTVLE QHDKPGGRAY VWQ_DQGFTF DAGPTV__IT

Explanation / Answer

The two proteins have similar amino acids at 20 positions. The positions are

6,7,9,11,12,14,16,18,19,23,28,30,36,37,38,47,50,51,53, and 54.

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