Chordates and Their Characteristics

Front

What are the three groups of living chordates?

Back

1. Cephalochordates (e.g., amphioxus) 2. Urochordates (e.g., tunicates) 3. Vertebrates (e.g., mammals – largest group)

Front

Chordates rank at what position in terms of species diversity?

Back

#1

Front

Which of the following is the largest group of living chordates?

Back

C. Vertebrates

Front

What role did chordates play in the fossil record?

Back

C. A significant role because of their hard physical structures

Front

What is the coelom?

Back

B. A fluid-filled internal body cavity

Front

The coelom is a major characteristic of which group?

Back

B. Deuterostomes

Front

During embryonic development, the indentation of cells that forms the blastopore is part of what process?

Back

C. Gastrulation

Front

If the mesoderm splits to form the body cavity, the result is a:

Back

C. Schizocoelom

Front

Which is true of protostomes?

Back

D. Their skeleton is derived from mesoderm

Front

Which is true of deuterostomes?

Back

D. The blastopore becomes the anus, and they usually form enterocoeloms