Question 1

Which of the following is a defining characteristic of all chordates at some point during their development?

Accepted Answer

Dorsal hollow nerve cord

Question 2

Which embryonic feature distinguishes deuterostomes from protostomes?

Accepted Answer

Formation of anus from blastopore

Question 3

A marine animal has a five-part radial symmetry as an adult, a water vascular system, and a calcium carbonate endoskeleton. To which phylum does it most likely belong?

Accepted Answer

Echinodermata

Question 4

Which of the following is NOT one of the three subphyla of chordates?

Accepted Answer

Echinodermata

Question 5

Which extra-embryonic tissue in amniotes is primarily responsible for gas exchange?

Accepted Answer

Chorion

Question 6

The evolution of jaws in vertebrates is believed to have originated from which structure?

Accepted Answer

Anterior-most gill arch cartilage

Question 7

Which of the following is a synapomorphy unique to vertebrates?

Accepted Answer

Neural crest cells

Question 8

Which group of Osteichthyes is characterized by fin rays in paired fins and the greatest species diversity among bony fishes?

Accepted Answer

Actinopterygii

Question 9

Which of the following is a correct sequence of evolutionary innovations in vertebrates, from earliest to latest?

Accepted Answer

Bony exoskeleton → Jaws → Bony endoskeleton → Limbs → Amniotic egg

Question 10

A scientist discovers a small marine animal that is a mobile suspension feeder, dioecious, and has external fertilization. It retains all four chordate characteristics throughout life. What is the most likely identity of this animal?

Accepted Answer

Cephalochordate (lancelet)

Question 11

Which of the following is a function of pharyngeal slits in vertebrate chordates?

Accepted Answer

Gas exchange

Question 12

Which of the following is a characteristic of amphibians that distinguishes them from amniotes?

Accepted Answer

Eggs laid in water and lack of amniotic membranes

Question 13

Which of the following equations best represents the relationship between the number of extra-embryonic membranes ($$n) $$and the number of major functions ($$f) $$they serve in amniotes, given that each membrane has at least one unique function and some overlap? Assume $$n = 4$$ and $$f = 5.$$

Accepted Answer

$$n \u003c f$$

Question 14

Which of the following is a key adaptation that allowed tetrapods to colonize terrestrial environments?

Accepted Answer

Evolution of limbs with digits

Question 15

Which of the following statements about the amniotic egg is TRUE?

Accepted Answer

It allows reproduction independent of water by enclosing water and food supply.

Question 16

Which of the following is a distinguishing feature of mammals compared to other amniotes?

Accepted Answer

Three middle ear bones

Question 17

A biologist is studying a vertebrate with a cartilaginous skeleton, paired fins, and internal fertilization. Which group does this animal most likely belong to?

Accepted Answer

Chondrichthyes

Question 18

Which of the following is a correct description of the function of the allantois in the amniotic egg?

Accepted Answer

Holds waste produced by the embryo

Question 19

Which of the following best explains why birds are considered part of the reptile clade?

Accepted Answer

They lay eggs and have scales on their feet.

Question 20

Which of the following is a real-world example of convergent evolution between marsupials and placental mammals?

Accepted Answer

Sugar glider and flying squirrel

Deuterostomes and Chordates: Structure, Diversity, and Evolution

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