GRE Subject Test: Biology : Understanding Types of Animals

Study concepts, example questions & explanations for GRE Subject Test: Biology

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Example Questions

Example Question #2 : Speciation And Phylogenetics

Which of the following is false of the phylum chordata?

Possible Answers:

They have bilateral symmetry

They have a notochord at some point in their development

They have a coelom

They are protostomes

Correct answer:

They are protostomes


All chordates are deuterostomes, not protostomes. During early development, the formation of the blastopore leads to the growth of the digestive tract. In protostomes, the blastopore develops into the mouth, while in deuterostomes it becomes the anus.

All chordates have a notochord during development, which eventually gives rise to the nervous system. Chordates also have a coelom, or fluid filled cavity, somewhere within the body and they all exhibit bilateral symmetry.

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