bio exam 3

Which of the following is true of both of the nonvertebrate chordates Urochordata and Cephalochordata? Multiple choice question.

They have a notochord

In echinoderms, the larvae are ___symmetrical, and the adults are ___ symmetrical.

bilaterally, pentaradially

Lancelets, which are members of the subphylum , are small, marine chordates.

chelaphochordata

Members of this phylum are characterized by a dorsal, hollow nerve cord, a notochord, pharyngeal gill slits, and a postanal tail.

chordata

Members of the phylum are characterized by a dorsal, hollow nerve cord, a notochord, pharyngeal gill slits, and a postanal tail.

cordata

There are more species of than all other vertebrates combined.

fish

Cephalochordates, or , are small marine chordates.

lancelets

A hypothetical version of the earliest vertebrates likely looked like a flattened hot dog, with a at one end and a at the other.

mouth fin

have chordate larval forms, which metamorphose into sessile, filter-feeding adults that bear little resemblance to other chordates

tunicates

Nonvertebrate chordates do not form. or other bones.

vertebrae

Select all that apply What are the characteristics of echinoderms?

Adults have pentaradial symmetry Deuterostome development Endoskeleton made of calcium carbonate plates

What organisms are in the class Ophiuroidea?

Brittle stars

Select all that apply Unlike tunicates and lancelets, vertebrates have which of the following?

Certain Internal organs An endoskeleton

Select all that apply Organisms with spiny skin that exhibit pentaradial symmetry as adults, and have an endoskeleton made of calcium carbonate plates, make up what phylum?

Echinodermata Echinoderms

Sea urchins and sand dollars belong to which of the following classes?

Echinoidea

Which of the following statements best describes symmetry in echinoderms?

Free-swimming larvae have bilateral symmetry, while the adult form is pentaradially symmetrical

Select all that apply Which of the following are key (defining) features of jawed fishes?

Internal gills Nutritional deficiencies Paired appendages A vertebral column Single-loop circulation

Which of the following accurately describes the first fishes?

they had a head and a primitive tail. Most had no vertebrae, although some had rudimentary vertebrae.

Despite how different their sessile, filter-feeding adult forms seem, larval clearly display chordate features.

tunicates