EEMB: Animals - Chordates

Question 1

The acorn worms are under what phylum?

Answer 1

hemichordata

Question 2

Marine deuterostomes are what?

Answer 2

acorn worms

Question 3

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

Answer 3

the pharynx- region posterior to the mouth

Question 4

Acorn worms use the pharynx as a _____ structure

Answer 4

respiratory

Question 5

3 principle chordate clades

Answer 5

cephalochordata (lancelets)

Urochordata (tunicates)

Verbrata (vertebrates)

Question 6

Members of the chordates have ____ diversity

Answer 6

extreme

Question 7

The ____ reflects the common ancestry of chordates

Answer 7

notochord

Question 8

Three shared traits of organisms in phylum chordata

Answer 8

dorsal hollow nerve cord

notochord

post anal tail

Question 9

What is the notochord?

Answer 9

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

Question 10

The name for the animal in the cephalochordates is

Answer 10

lancelets

Question 11

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

Answer 11

shallow sandy bays

persistent notochord in adults

Question 12

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

Answer 12

myomeres

Question 13

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

Answer 13

bends

Question 14

The three groups of animals under the clade Urochordates are ____

Answer 14

tunicates (sea squirts)

Thaliaceans

Lavaceans

Question 15

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

Answer 15

adults are sessile

nerve and notochord dissapear

Question 16

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

Answer 16

tunic

sac-like

two siphons

Question 17

Tunicates have an enlarged pharynx called the ___

Answer 17

pharyngeal basket

Question 18

How do Tunicates feed?

Answer 18

suspension feeding

Question 19

What is the Ascidian genome project?

Answer 19

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

Question 20

What is the “2R Hypothesis”

Answer 20

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

Question 21

In vertebrates the notochord is replaces by

Answer 21

a vertebral column

Question 22

the first vertebrates lacked ___ and include what two animals?

Answer 22

lacked jaws

hagfish
lamprey

Question 23

T/F: hagfish have vertebrae

Answer 23

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