deuterostomes (exam3)

Question 1

Are deuterostomes vertebrates or invertebrates?

Answer 1

they can be both

Question 2

In deuterostomes does the mouth or anus form first?

Answer 2

anus

Question 3

What are echinoderms?

Answer 3

a branch of deuterostomes

Question 4

How does symmetry change in juvenile/adult echinoderms?

Answer 4

-bilaterally symmetrical larvae
-radially symmetrical adults (no head)

Question 5

What are the exoskeletons of echinoderms made of?

Answer 5

calcium carbonate

Question 6

All deuterostomes live in ____ environments.

Answer 6

marine

Question 7

Describe the “water vascular system” in echinoderms

Answer 7

-Tubes on the inside of the organism fill with and release water based on the beating of cilia.
-Tube feet project from the system.
-This acts as a movement structure.

Question 8

What are chordates?

Answer 8

a branch of deuterostomes

Question 9

Pharyngeal gill slits

Answer 9

openings into the throat or pouches in the throat

Question 10

Notochord

Answer 10

-a stiff & supportive but flexible rod that runs the length of the body
-lost in many adult vertebrates

Question 11

Dorsal hollow nerve cord

Answer 11

the brain and spinal cord

Question 12

What is the body plan of cephalochordates?

Answer 12

have all 4 parts and look like a small tube/fish

Question 13

What is the body plan of urochordates?

Answer 13

have all 4 parts as a juvenile, but loose everything except the pharyngeal gill slits as adults

Question 14

How do the 4 main body parts function in vertebrates?

Answer 14

-the dorsal hollow nerve cord becomes the spinal cord
-pharyngeal slits can develop into gills
-the tail occurs in all lineages but can be lost
-the notochord usually functions as cells in the spinal disks

Question 15

are vertebrates a monophyletic group?

Answer 15

yes