Deck 34: Protostomes

Question 1

Which feature is an evolutionary novelty of hexapods?

A)Jointed appendages
B)Mandibles
C)Chitinous exoskeletons
D)Wings

Answer 1

D

Question 2

Barnacles are sessile filter feeders but unlike bivalves they have internal fertilization.How do they solve this problem?

A)The filter sperm from the water column.
B)They get fertilized during free living larval stages.
C)They are only capable of asexual reproduction.
D)They are hemaphrodites with especially long penises.

Answer 2

D

Question 3

At a celebratory dinner for a recent publication, a marine biologist ordered the lobster claw appetizer.What part did she order?

A)Nauplius
B)Telson
C)Uropods
D)Cheliped

Answer 3

D

Question 4

What is a simple way for determining if an annelid is a polychaete or a clitellate?

A)The number of segments
B)Possession of a closed circulatory system
C)The amount of chaetae (setae)
D)The layout of the digestive system

Question 5

Interoctopus communication is facilitated by

A)a radula.
B)mantle connections.
C)chromatophores.
D)chemical pheromones.

Question 6

Dibenzoylhydrazines are a category of molecules that have been used as insecticides.They work by blocking ecdysteroid receptors.How does this kill an insect?

A)The insect can no longer excrete nitrogenous wastes.
B)The insect cannot molt.
C)The insect can no longer coordinate its movements.
D)The chitinous exoskeleton is dissolved.

Question 7

If a hiker picked up a mollusk on a trail in a rain forest, what class would it belong to?

A)Gastropoda
B)Polyplacophora
C)Bivalvia
D)Cephalopoda

Question 8

How could a paleontologist distinguish between a bryozoan fossil and a brachiopod fossil?

A)Bryozoans are large and solitary.
B)Zoecia are always found in aggregates.
C)You can only distinguish the two by examining the lophophore.
D)Bryozoans often look like bivalves.

Question 9

What would result if a leech had a mutation causing it to secrete low levels of anticoagulants?

A)The pain of the leech bite would cause the leech to be detected.
B)The leech would have a hard time locating appropriate hosts.
C)The blood would stop flowing after a short time.
D)The leech would have a hard time remaining attached to its host.

Question 10

A snail in your garden and an oyster are quite different in appearance.What would be evidence to justify grouping them together?

A)Both use a radula for feeding.
B)Both have a mantle capable of secreting calcium carbonate.
C)Both use siphons to obtain oxygen.
D)Both have sensory antenna.

Question 11

Scorpions have a prosoma, pedipalps that are modified into claws, and chelicerae.Which taxonomic group are they a member of?

A)Chelicerata
B)Hexapoda
C)Crustacea
D)Myriapoda

Question 12

Pinworm is a nematode parasite that lives in the human rectum, and causes itching in the anal area.What best explains the itching symptom?

A)Any kind of parasite will naturally irritate the skin.
B)The itching induces the person to scratch, helping to spread the parasite to another person.
C)The itching is a side-effect when the immune system has successfully attacked the nematode.
D)The itching is because of the mismatch between humans and the parasite's natural host.

Question 13

Humans have direct development, a closed circulatory system, well-developed eyes, and large brains.Which mollusk also shares these features?

A)Chiton
B)Slug
C)Octopus
D)Nudibranch

Question 14

Inside its beak an octopus has a rasping tongue that is used to tear apart food.Which gastropod structure is this analogous to?

A)Mantle
B)Shell
C)Radula
D)Nephridium

Question 15

How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?

A)Contraction of the circular muscles
B)Contraction of the longitudinal muscles
C)Relaxing the chaetae (setae)
D)Pulling on the chaetae (setae)

Question 16

In what way are a human and a crab similar?

A)Vertebrates and arthropods are deuterostomes.
B)Both have muscles that pull against rigid skeletons.
C)Both have closed circulatory systems.
D)Both have a continuous growth pattern.

Question 17

Paramecia use cilia for locomotion and for gathering organic matter.How are rotifers similar?

A)Rotifers are single-celled protists
B)The corona is made of cilia, and used for swimming and feeding.
C)Rotifers and ciliates are thought to have given rise to all other animal phyla.
D)Both lack a gut.

Question 18

An entomologist observed a locust sitting on a branch pumping its abdomen like an accordion.What is the insect most likely doing?

A)Speeding the flow of blood through its veins and arteries
B)Assisting gas exchange in the tracheal system
C)Clearing its spinnerets
D)Stretching out its pedipalps

Question 19

The lophophore of a brachiopod serves the same function as the __________ in a bivalve.

A)Mantle
B)Foot
C)Shell
D)Gills

Question 20

What change would result for a land snail that had a mutation interfering with chitin formation?

A)It would have a soft, demineralized shell.
B)It would have difficulty feeding.
C)It could not form its exoskeleton.
D)Molting would not be possible.

Question 21

In many arthropods, body segments have become fused into functional groups called _____.

Question 22

The phyla Bryozoa and Brachiopoda have which feature in common?

A)nephridia
B)a lophophore
C)a radula
D)setae

Question 23

The molluscan class ________ includes the snails and slugs.

Question 24

Turbellarian flatworms have a distinct head.When compared to the head of an insect, what is the flatworm head missing? rev: 05_14_2014_QC_49568

A)Sensory organs
B)Light sensitive structures
C)Anterior collection of nerve cells
D)A mouth

Question 25

A _________ is a circular or U-shaped ridge around the mouth, bearing either one or two rows of ciliated, hollow tentacles.

Question 26

Squids and octopuses move by means of water movement through their

A)tentacles.
B)cilia and flagella.
C)modified mantle cavity.
D)muscular foot.

Question 27

The cephalopod mollusks have

A)a muscular foot.
B)tentacles.
C)two siphons.
D)setae.

Question 28

Why doesn't a tapeworm have a mouth on its scolex?

A)The mouth is on the proglottids
B)Endoparasites don't need a mouth
C)The mouth is located at the end of the pharynx
D)Tapeworms use a radula instead of a mouth to feed

Question 29

In their basic body plan, mollusks have a visceral mass covered with a soft epithelium and a muscular ____ that is used in locomotion.

Question 30

Trochophores, the free-swimming larvae of many mollusks, are propelled through the water by

A)flagella.
B)cilia.
C)flame cells.
D)nephridia.

Question 31

The partitions that separate the segments of the annelid body are known as

A)pseudocoels.
B)nephridia.
C)setae.
D)septa.

Question 32

The nitrogenous waste in mollusks is removed by

A)flame cells.
B)nephridia.
C)Malpighian tubules.
D)incurrent siphon.

Question 33

Radula modification allowed all of the following functions in gastropods except

A)scraping algae off rocks.
B)eating vegetation.
C)boring holes in other mollusk shells.
D)protecting themselves with nematocysts.

Question 34

Which of the following organs of cephalopods resemble those of the vertebrates?

A)arms
B)nephridia
C)eyes
D)digestive tissues

Question 35

According to the modern classification scheme, which animal would be a spider's closest relative?

A)A snail
B)An earthworm
C)A tapeworm
D)A roundworm

Question 36

Brachiopods develop as protostomes, but they show ______ cleavage.

Question 37

The organ that is responsible for secreting cocoons in the oligochaetes is known as the

A)nephridia.
B)setae.
C)radula.
D)clitellum.

Question 38

The phylum that includes snails, clams, oysters, and octopuses is the

A)Ectoprocta.
B)Brachiopoda.
C)Mollusca.
D)Annelida.

Question 39

In mollusks, the folds of tissue that arise from the dorsal body wall and enclose a cavity surrounding the visceral mass are called the

A)foot.
B)mantle.
C)nephridia.
D)radula.

Question 40

The rasping tongue, the radula, is present in which molluscan group?

A)bivalve
B)oyster
C)clam
D)snail

Question 41

Each segment of an annelid typically contains bristles of chitin called

A)cilia.
B)parapodia.
C)chaetae.
D)leglets.

Question 42

The passage of an arthropod through stages from egg to adult is

A)differentiation.
B)evolution.
C)graduation.
D)metamorphosis.

Question 43

A marine biologist visits your biology class and begins his talk entitled, "Life as a Trochophore." A friend seated next to you asks, "What is a trochophore?" You explain that a trochophore is

A)another name for the veliger stage in earthworm reproduction.
B)a term used to describe a larval form of either the phylum Mollusca or Annelida.
C)another name for the veliger stage in the oyster.
D)similar to a lophophore, but only found in the phylum Annelida.

Question 44

Earthworms show all of the following features except

A)containing segments with a mouth on the first and the anus on the last.
B)containing touch-sensitive and light-sensitive organs in the segments.
C)containing fewer setae than in polychaetes.
D)containing distinct head regions and parapodia.

Question 45

All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except

A)the mantle.
B)a radula.
C)a shell.
D)gills.

Question 46

Air passage into the trachea of most insects is controlled by the closing and opening of valves, which operate special openings called

A)spiracles.
B)ocelli.
C)ommatidia.
D)book lungs.

Question 47

You and your biology lab class take a field trip to a marine aquarium.Your guide is a marine biologist who studies squids.She explains to your class how squids are able to blend into their environment.She points out that squids have pouches of pigments embedded in their epithelium.The pouches are called

A)trochophores.
B)spermatophores.
C)lophophores.
D)chromatophores.

Question 48

The excretory structures of terrestrial arthropods are slender projections from the digestive tract that are attached at the junction of the midgut and hindgut.These are called

A)flame cells.
B)kidneys and bladders.
C)Malpighian tubules.
D)nephridia.

Question 49

Eyes with single lenses that respond to light and darkness are found in many arthropods; these are the

A)compound eyes.
B)ocelli.
C)apposition eyes.
D)ommatidia.

Question 50

Compound eyes are composed of independent visual units called

A)apposition segments.
B)ocelli.
C)ommatidia.
D)retinas.

Question 51

The sexual reproduction of earthworms characteristically is

A)hermaphroditic but cross-fertilizing.
B)hermaphroditic but self-fertilizing.
C)normal type between individuals who remain as males and females throughout their life time.
D)normal appearing, but individuals change sex periodically.

Question 52

In some arthropods tagmatization has produced a combination of head and thorax known as a

A)cephalothorax.
B)fused corpora.
C)headless mite.
D)larval instar.

Question 53

In terms of the number of species, the most successful class of arthropods is

A)Hexapoda.
B)Chelicerata.
C)Crustacea.
D)Chilopoda.

Question 54

The medicinal leech, once used to withdraw "unhealthy" blood from patients, produces ____________ to ensure blood flow from the host?

A)antibiotics
B)antibodies
C)anticoagulants
D)blood clots

Question 55

Nauplius, a unique kind of larva, is characteristic of

A)mites.
B)crustaceans.
C)horseshoe crabs.
D)insects.

Question 56

Select the mismatched pair of Phylum Mollusca classes and their examples.

A)Polyplacophora-chitons
B)Gastropoda-slugs
C)Bivalvia-snails
D)Cephalopoda-nautilus

Question 57

Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called

A)Agnathae.
B)Amandibulata.
C)blood suckers.
D)chelicerates.

Question 58

The rigid chitinous exoskeleton of an arthropod has all of the following functions except it

A)provides a place for muscle attachment.
B)protects the animal from predators.
C)impedes water loss.
D)maintains a uniform size for all individuals of that species.

Question 59

In arthropods, locomotion is accomplished by muscles that work against

A)each other.
B)the exoskeleton.
C)a hydrostatic skeleton.
D)mineralized bones.

Question 60

The evolutionary innovation that first appeared in arthropods and is characteristic of the most successful of all animal groups is that of

A)bilateral symmetry.
B)coelomic body architecture.
C)jointed appendages.
D)segmentation.

Question 61

Which one of the following incorrectly matches a molluscan structure with its typical function?

A)ctenidia-secretion of the shell (when present)
B)visceral mass-houses organs of digestion, excretion, reproduction
C)foot-locomotion
D)nephrostome-collection of nitrogenous wastes

Question 62

Chelicerae function as

A)eyes.
B)fangs or pincers.
C)jaws or mandibles.
D)teeth.

Question 63

The side to side thrashing of a nematode is accomplished by contraction of its circular muscles.

Question 64

Decapod crustaceans (shrimps, lobsters, and crabs) all lack

A)a carapace, a dorsal cephalothorax shield.
B)a ventral line of appendages, swimmerets.
C)a tail spine, telson.
D)chelicerae.

Question 65

How does a ribbon worm differ from a flatworm?

A)A flatworm has a complete digestive system.
B)A ribbon worm has a mouth and an anus.
C)Flatworms are deuterostomes.
D)Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical.

Question 66

A marine biologist makes a presentation about crustaceans to your biology class.He explains that he has recently received an NSF grant to study sessile crustaceans.You are only aware of one group of sessile crustaceans.This crustacean must be

A)a lobster.
B)a crayfish.
C)a shrimp.
D)a barnacle.

Question 67

Which one of the following insect organ systems has placed the greatest limitation on their body size?

A)nervous system
B)digestive system
C)respiratory system
D)reproductive system

Question 68

Which one of the following incorrectly matches a molluscan group with a feature characterizing that group?

A)Gastropoda-torsion
B)Nudibranchs-extensive gills in mantle cavity
C)Bivalvia-reduced head and no radula
D)Polyplacophora-eight calcareous plates

Question 69

Which one of the following statements about the phylum Brachiopoda is false?

A)Brachiopods are often misidentified as bivalves.
B)Brachiopods were much more diverse in the past.
C)As in bivalves, the valves in brachiopods are lateral (left and right) to the body axis.
D)Most brachiopods are sessile (attached).