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10 September, 10:00

2) A portion of the amino acid sequence of an enzyme from a worm is shown below; - Q-Q-N-N-C-C Analyze the same portion of the same enzyme taken from several other organisms. Place them in order from most closely related to the worm to the most distantly related to the worm, - Q-R-Q-N-S-S-C-C - organism X - Q-Q-Q-N-N-S-C-C - organism Y - Q-Q-R-N-S-N-C-C - organism Z A) Z, Y, X B) Y, Z, X C) X, Z, Y D) Y, X, Z

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  1. 10 September, 10:04
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    The correct option is D) Y, X, Z

    Explanation:

    The similarities in the amino acid sequence might predict that the organisms which share the most similar sequence are more closely related to one another.

    As we can see the sequence Y, Q-Q-Q-N-N-S-C-C - is shares the most similarities with the given amino acid sequence of an enzyme from a worm, hence it is the most similar. The sequence X, - Q-R-Q-N-S-S-C-C-, shares more similarities with the amino acid sequence of the worm hence it is more closely related as compared to the sequence mentioned in option Z which is - Q-Q-R-N-S-N-C-C-.
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