SAT Subject Biology Practice Question 339: Answer and Explanation

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Question: 339

9. At some point in their development, chordates possess all of the following EXCEPT

A. a dorsal hollow nerve cord
B. a notochord
C. gill slits
D. postanal tail
E. an exoskeleton

Correct Answer: E

Explanation:

E Remember your LEAST/EXCEPT/NOT technique. There are four features present in all chordates-dorsal nerve cords (choice A), notochords (choice B), gill slits (choice C), and postanal tails (choice D). Note that some of these features may be found only in embryonic or larval stages. The "wrong" answer is choice E-not all chordates (for example, sea squirts and lancelets) have a bony endoskeleton.

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