Question 1

Which of the following is a defining characteristic of all Bilateria?

Accepted Answer

Presence of a coelom, bilateral symmetry, and three tissue layers

Question 2

During embryonic development, what is the fate of the blastopore in protostomes?

Accepted Answer

It becomes the mouth

Question 3

Which of the following best describes the cleavage pattern and cell fate determination in protostomes?

Accepted Answer

Spiral, mosaic cleavage

Question 4

Why can't protostomes produce identical twins naturally?

Accepted Answer

Their embryos use determinate cleavage, so removing a cell kills the embryo

Question 5

Which of the following is a synapomorphy of the phylum Arthropoda?

Accepted Answer

Exoskeleton made of chitin and jointed appendages

Question 6

What is the process of ecdysis in Ecdysozoans?

Accepted Answer

The process of molting a hard exoskeleton or cuticle

Question 7

Which of the following statements about nematodes is correct?

Accepted Answer

They are pseudocoelomates and may be free-living or parasitic

Question 8

A patient presents with severe swelling of the leg due to lymphatic blockage. Which parasitic nematode is most likely responsible for this condition?

Accepted Answer

A nematode causing elephantiasis

Question 9

Which of the following best explains why insects are the most diverse group of animals?

Accepted Answer

They have three pairs of legs, three body segments, and one pair of antennae

Question 10

Which of the following is NOT a feature used to distinguish between major arthropod classes?

Accepted Answer

Presence of a pseudocoelom

Question 11

Which of the following best describes the growth pattern of Ecdysozoans compared to Lophotrochozoans?

Accepted Answer

Ecdysozoans grow by molting, while Lophotrochozoans grow incrementally

Question 12

A child in the United States is diagnosed with an intestinal parasite that lays eggs in the anus, leading to fecal-oral transmission. Which nematode is most likely responsible?

Accepted Answer

Pin worm

Question 13

Which of the following is a real-world example of using biological knowledge to control an arthropod pest population?

Accepted Answer

Eradication of New World screw worm using sterile male flies

Question 14

Which of the following is a correct statement about tagma in arthropods?

Accepted Answer

Tagma are fused body segments with a unified function

Question 15

Which of the following best explains why removing a single cell from a protostome embryo is lethal?

Accepted Answer

Protostomes use determinate (mosaic) cleavage, so each cell's fate is fixed early

Question 16

Which of the following is a correct match between a nematode and its mode of transmission?

Accepted Answer

Pin worm: ingestion of eggs via fecal-oral route

Question 17

Which of the following is a key difference between protostomes and deuterostomes?

Accepted Answer

Protostomes have spiral, determinate cleavage; deuterostomes have radial, indeterminate cleavage

Question 18

Which of the following best describes the function of the exoskeleton in arthropods?

Accepted Answer

It provides structural support and protection, and is made of chitin

Question 19

Which of the following is a real-world consequence of the grasshopper-to-locust transformation?

Accepted Answer

It causes swarming behavior that can devastate agricultural fields

Question 20

Which of the following best explains why Ecdysozoans must molt to grow?

Accepted Answer

Their exoskeleton is rigid and must be shed to allow for body expansion

Protostome Animals: Introduction and Ecdysozoans

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