BIO 201 Lecture Notes - Notochord, Harpoon, Cephalopod
• Question 1
0 out of 1 points
What is true of protostomes? (Select all that apply)
Selected Answers:
A.
Have a coelom
B.
Are bilaterally symmetric
D.
Blastopore becomes the anus
Answers:
A.
Have a coelom
B.
Are bilaterally symmetric
C.
Have four tissue layers
D.
Blastopore becomes the anus
E.
Have more species than deuterostomes
• Question 2
1 out of 1 points
What are the synapomorphies of chordates?
B.
A tail extending beyond the anus
C.
A hollow nerve cord
E.
A notochord
Answers:
A.
An anterior skull
B.
A tail extending beyond the anus
C.
A hollow nerve cord
D.
A vertebral column
E.
A notochord
F.
An internal skeleton
Response
Feedback:
Hollow dorsal nerve cords, tails, and notochords define the chordates. Internal
skeletons are found in all deuterostomes, and the vertebral column and anterior skull
are found in only some chordates.
• Question 3
1 out of 1 points
Which deuterostome lineage has lost a head?
Selected Answer:
C.
Echinoderms
Answers:
A.
Chordates
B.
Vertebrates
C.
Echinoderms
D.
Lampreys
E.
Cnidarians
Response
Feedback:
Chordates, vertebrates, and lampreys all fall within the deuterostomes, but none have
lost a head. Cnidarians are not deuterostomes. Echinoderms such as sea stars have
lost a head and regained radial symmetry instead of bilateral symmetry.
• Question 4
0 out of 1 points
Which of the following are true about protostome mollusks?
Selected Answers:
A.
The cephalopod eye does not have a “blind spot”
E.
Some snails can drill holes in clam shells
Answers:
A.
The cephalopod eye does not have a “blind spot”
B.
Some mollusks have teeth containing metal
C.
Molting is a character state that defines the mollusks
D.
Some mollusks have been used to develop new painkillers
E.
Some snails can drill holes in clam shells
Response Feedback:
Molting defines ecdysozoans.
• Question 5
0 out of 1 points
Which of the following statements is true about protostome mollusks?
Snails can drill holes through clam shells using their teeth
Answers:
The radula can be used to scrape or harpoon
New painkillers are bring developed from snail venom
Unlike the human eye, the cephalopod eye lacks a "blind spot"
Snails can drill holes through clam shells using their teeth
