Multiple Choice
Which of the following lists correctly represents the seven hierarchical levels of the traditional Linnaean classification system, from the most inclusive to the most specific?
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1. Introduction to Biology
Introduction to Taxonomy
Multiple Choice
Which of the following is true about deuterostomes?
A
They include all arthropods and mollusks.
B
They exhibit spiral and determinate cleavage.
C
Their coelom forms by splitting of the mesoderm (schizocoely).
D
The blastopore develops into the anus during embryonic development.
Verified step by step guidance1
Understand the term 'deuterostomes': Deuterostomes are a group of animals characterized by their embryonic development, where the blastopore (the first opening formed during gastrulation) develops into the anus. This is a key feature distinguishing them from protostomes, where the blastopore develops into the mouth.
Review the incorrect options: The statement 'They include all arthropods and mollusks' is incorrect because arthropods and mollusks are protostomes, not deuterostomes. Similarly, 'They exhibit spiral and determinate cleavage' is incorrect because deuterostomes exhibit radial and indeterminate cleavage during early embryonic development.
Clarify the coelom formation: The statement 'Their coelom forms by splitting of the mesoderm (schizocoely)' is incorrect because deuterostomes form their coelom through enterocoely, where the mesoderm buds off from the wall of the archenteron (the primitive gut). Schizocoely is characteristic of protostomes.
Identify the correct statement: The correct answer is 'The blastopore develops into the anus during embryonic development,' which is a defining feature of deuterostomes.
Summarize the key characteristics of deuterostomes: Deuterostomes include phyla such as Echinodermata (e.g., starfish) and Chordata (e.g., vertebrates). They exhibit radial and indeterminate cleavage, enterocoely for coelom formation, and the blastopore develops into the anus.
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