Chapter 32 Questions

Front 1

Name five major features of animal phylogenies that are supported by systematic analyses of morphological characters and recent molecular studies

Back 1

1) all animals share a common ancestor.
2) sponges are basal animals
3) Eumetazoa is a clade of animals with true tissues
4) Most animal phyla belong to the clade Bilateria
5) Chordates and some other phyla belong to the clade deuterostomia

Front 2

List five (distinguishing) characteristics (that other kingdoms don't have in common) that combine to define animals.

Back 2

1) Extracellular matrix with structure protein collagens.
2) Muscle and nervous system
3) Sex
4) Cleavage
5) Gap, tight, desmosomes

Front 3

What are the three lines of evidence that choanoflagellates are the closest living relatives of animals

Back 3

1) Chonoflagellates look just like collar cells of sponges
2) Similar cells found in other animals, but no other organisms
3) DNA sequences show similarity in adhesion

Front 4

Explain how animal symmetry may match the animal's way of life.

Back 4

Radial animals are equip to meet the enviroment equally well from all sides. Bilateral animals have a central nervous system that enables them to coordinate the complex movements involved in crawling, flying, or swimming.

Front 5

Development of protostomes
a) pattern of cleavage
b) fate of the blastopore
c) coelom formation

Back 5

A) Spiral determinate
B) Mouth forms
C) coelom forms from splits in mesoderm

Front 6

Development of deuterostomes
a) pattern of cleavage
b) fate of the blastopore
c) coelom formation

Back 6

A) radial indeterminate
B) Mouth forms from a secondary opening.
c) coelom forms from mesodermal outpocketing of the archenteron

Front 7

Explain the function of a body cavity.

Back 7

Its fluid cushions the suspended organs, helping to prevent internal injury.Enables the internal organs to grow and move independently of the outer body wall.