Multiple Choice
Which of the following lists correctly represents the seven hierarchical levels of biological classification 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 best describes the primary difference between protostomes and deuterostomes during embryonic development?
A
In protostomes, the blastopore becomes the anus, while in deuterostomes, it becomes the mouth.
B
Protostomes have radial cleavage, while deuterostomes have spiral cleavage.
C
Protostomes lack a coelom, while deuterostomes possess a coelom.
D
In protostomes, the blastopore becomes the mouth, while in deuterostomes, it becomes the anus.
Verified step by step guidance1
Understand the key terms: Protostomes and deuterostomes are two major groups of animals classified based on their embryonic development patterns.
Focus on the blastopore: The blastopore is the opening that forms during the early stages of embryonic development. Its fate differs between protostomes and deuterostomes.
Identify the difference: In protostomes, the blastopore develops into the mouth, while in deuterostomes, it develops into the anus. This is the primary distinction between the two groups.
Clarify cleavage patterns: Protostomes typically exhibit spiral cleavage during early cell division, whereas deuterostomes exhibit radial cleavage. This is another developmental difference but not the primary one mentioned in the problem.
Address coelom formation: Both protostomes and deuterostomes can possess a coelom (body cavity), but the method of coelom formation differs. This is not the focus of the problem, so it is secondary to the blastopore distinction.
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