Hemichordata and Chordata

Question 1

Phylum hemichordate is known as the ______

Answer 1

acorn worm

Question 2

What phyla have members possessing doral nerve chords?

Answer 2

Hemichordata and Chordata

Question 3

What phyla have members possessing Pharengeal Gill slits?

Answer 3

Hemichordata and chordata

Question 4

what are the four characteristics an organism must posses in order to be a chordate

Answer 4

Pharyngeal gill slits, Notochord, Muscular Post-anal tail (and blocks of muscle), Dorsal hollow nerve chord.

Question 5

Subphylum Urochordata includes______

Answer 5

Turnicates/seasquirts

Question 6

Are Urocordates sessile or motile?

Answer 6

Sessile

Question 7

Adult Urochordates have _______ symmetry and what body plan?

Answer 7

Radial, Sac.

Question 8

Larval Urochordates have _______ symmetry

Answer 8

Bilateral

Question 9

Feeding method of urochordates

Answer 9

filter feeder

Question 10

Urochordate larva have all 4 characteristics of chordates, adults have_______

Answer 10

one, the pharyngeal gill slits

Question 11

What are pharyngeal gill slits function in invertebrate chordates?

Answer 11

Filter/suspension feeding

Question 12

Proboscis is in ___________ & _________

Answer 12

nermetea and Hemichordata

Question 13

Common name for Subphylum Cephalochordata?

Answer 13

Lancelet

Question 14

Adult members of subphylum cephalochordate posses which of the four characteristics?

Answer 14

Pharyngeal gill slits, Notochord, Muscular Post-anal tail, Dorsal hollow nerve chord.

Question 15

Subphylum craniate is the only phylum to include this special characteristics.

Answer 15

True vertebratates

Question 16

Subphylum craniate is split into groupings_______ and _______

Answer 16

Pisces and Tetrapoda

Question 17

In Craniata, the backbone can be_______ or _________

Answer 17

Cartilaginous or Calcified

Question 18

What have cartilaginous back bones?

Answer 18

Only Hagfish and Chondrichthyes

Question 19

What is the retention of juvenile characteristics called?

Answer 19

Neoteny or Paedomorphis

Question 20

Craniates have these 3 unique features in their heads

Answer 20

Brains, Sensory organs (taste, smell, sight, hearing), and a protective skull

Question 21

What genetic evidence distinguishes craniates from other chordates

Answer 21

Craniates have 2 clusters of Hox Genes, Urochordates Tunicates and Cephalochordata (lanclets), have one.

Question 22

What is a nueral crest? what is it unique to?

Answer 22

a collection of cells near the dorsal margin of the closing neural tube.

Question 23

The neural crest gives rise to ___________

Answer 23

Some bones and cartilage in the skull

Question 24

What other than genetic and macromophological differences, what other characteristics are exclusive to craniates, relative to other chordates

Answer 24

• higher metabolism
• more muscular
• rbc’s with hemoglobin
• heart with at least 2 chambers
• kidneys