Exam 34: Protostomes

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

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

The cephalopod mollusks have

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

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

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

The molluscan class ________ includes the snails and slugs.

The nitrogenous waste in mollusks is removed by

Interoctopus communication is facilitated by

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

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

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

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

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

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

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

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

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

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

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