EEMB: Animals - Chordates

Question 2

The acorn worms are under what phylum?

Answer 2

hemichordata

Question 3

Marine deuterostomes are what?

Answer 3

acorn worms

Question 4

What body structure was a important development in the metazoans? where is it located?

Answer 4

the pharynx- region posterior to the mouth

Question 5

Acorn worms use the pharynx as a _____ structure

Answer 5

respiratory

Question 6

3 principle chordate clades

Answer 6

cephalochordata (lancelets)Urochordata (tunicates)Verbrata (vertebrates)

Question 7

Members of the chordates have ____ diversity

Answer 7

extreme

Question 8

The ____ reflects the common ancestry of chordates

Answer 8

notochord

Question 9

Three shared traits of organisms in phylum chordata

Answer 9

dorsal hollow nerve cordnotochordpost anal tail

Question 10

What is the notochord?

Answer 10

a cartilage rod that runs under the nerve chord to support it

Question 11

The name for the animal in the cephalochordates is

Answer 11

lancelets

Question 12

Where are lanclets found? What body structure is persistent in adults?

Answer 12

shallow sandy bayspersistent notochord in adults

Question 13

The muscles of the body is divided up into V-shaped blocks called

Answer 13

myomeres

Question 14

since the notochord is not compressible, the body of lancelet ____ to swim/move

Answer 14

bends

Question 15

The three groups of animals under the clade Urochordates are ____

Answer 15

tunicates (sea squirts)ThaliaceansLavaceans

Question 16

What is different about the larval to adult stage of tunicates (urochordates) ?

Answer 16

adults are sessilenerve and notochord dissapear

Question 17

Bodies of tunicates are covered by a ____. and have a ____-like body with ___ siphons

Answer 17

tunicsac-liketwo siphons

Question 18

Tunicates have an enlarged pharynx called the ___

Answer 18

pharyngeal basket

Question 19

How do Tunicates feed?

Answer 19

suspension feeding

Question 20

What is the Ascidian genome project?

Answer 20

80% of Ciona genes are found in humans (thats why we’re related to chordates)

Question 21

What is the “2R Hypothesis”

Answer 21

that the genome replicated twice during chordate evolution that leads to vertebrates

Question 22

In vertebrates the notochord is replaces by

Answer 22

a vertebral column

Question 23

the first vertebrates lacked ___ and include what two animals?

Answer 23

lacked jawshagfishlamprey

Question 24

T/F: hagfish have vertebrae

Answer 24

FALSE - even though they were the ancestra vertebrates…..