Chapter 32 Test 3

Animals probably evolved from colonial protists. How do animals differ from these protist ancestors?

Many young animals are __________, a sexually immature form that is morphologically distinct from the adult stage. These young animals undergo __________ to become __________, which resemble adults but are not yet sexually mature.

Which of the following is the defining characteristic of the clade Ecdysozoa for which this group is named?

Diploblastic animals have an _________ as well as _________ symmetry

Radially symmetric animals tend to be __________, while bilaterally symmetric animals ___________.

Embryonic tissues develop during the _________ stage.

Animals have a "toolkit" called the _________ that regulates the _________ of the developing embryo.

Coelomates have a body cavity that is formed from _________.

When using terms such as coelomates and pseudocoelomates, a "grade" is _________.

Which of the following is the defining characteristic of the clade Ecdysozoa for which this group is named?

Diploblastic animals have an _________ as well as _________ symmetry.

An animal with a true coelom that has __________ cleavage must be a __________.

Which of the following occurred during the Mesozoic era?

Triploblastic animals have an _________ as well as _________ symmetry.

If the blastopore does not form, ________.

developmental fate of each embryonic cell is determined very early

The protist group that is most closely related to animals is a _________.

If the blastopore does not form, ________.

Cadherins are __________.

Which of the following is a characteristic of cnidarians?

Which of the following correctly lists the embryonic stages in the order that they develop?

Consider the two phylogenetic hypotheses regarding the relationships of the animal phyla. The tree that is based on molecular evidence differs from the tree based on morphological evidence in that it __________.

Indeterminate cleavage is a process that produces embryonic cells that __________.

Which characteristic below is shared by plants, fungi, and animals?

Morphological traits, ribosomal RNA genes, Hox genes, protein-coding genes, nuclear genes, and mitochondrial genes all indicate that animals __________.

Which example below is a current hypothesis regarding the Cambrian explosion?

The roundworm body cavity is ________, whereas the planarian body cavity is ________.

Which of the following is a trait shared by protostomes and deuterostomes?

The three major clades of bilaterian animals are the __________.

Symmetry is one of the most basic characteristics of animals. The group that has a different symmetry from the other four groups listed here is the __________.

Which of the following is associated with bilateral symmetry?

Molecular evidence that points to choanoflagellates as living relatives of animals is that they __________.

During the development of most animals, cleavage leads to __________.