The largest unit within which gene flow can readily occur is a

A) population

B) species

C) genus

D) hybrid

E) phylum

Answer: B

What would be the most effective method of reducing the incidence of blood flukes in a human population?
A) reduce the mosquito population
B) reduce the population of the intermediate snail host
C) purify all drinking water
D) avoid contact with rodent droppings
E) carefully wash all raw fruits and vegetables

Answer: B

Which of the following animal groups is entirely aquatic?
A) Mollusca
B) Crustacea
C) Echinodermata
D) Nematoda
E) Platyhelminthes

Answer: C

^{Assuming chimps and gorillas are human's closest relatives removing humans from the great ape clade placing them in a different clade has the effect of making the phylogenetic tree of the great apes}

^{A) polyphyletic}

^{B) paraphyletic}

^{C) monophyletic}

^{D) conform with Linnaeus' view of great ape phylogeny}

Answer: B

^{You find a multi-legged animal in your garden and want to determine if it is a centipede or a millipede. You take the animal to a university where a myriapodologist quickly tells you that you have found a centipede. Which of the following traits may have allowed her to make this distinction?}

^{A) presence of body segments}

^{B) poisonous claws}

^{C) egg- laying}

^{D) molting}

^{E) two pairs of legs per body segment}

Answer: B

^{Macroevolution is ____}

^{A) the same as microevolution, but includes the origin of new species}

^{B) evolution above the species level}

^{C) defined as the evolution of microscopic organisms into organisms that can be seen with the naked eye}

^{D) defined as a change in allele or gene frequency over the course of many generations}

^{E) indistinguishable from microevolution}

Answer: B

^{Which of the following combinations correctly matches a phylum to its description?}

^{A) nematode --> segmented worms, closed circulatory system}

^{B ) cnidaria --> flatworms, gastrovascular cavity, acoelomate}

^{C) platyheminthes --> radial symmetry, polyp and medusa body forms}

^{D) porifera --> triploblastic; sexual reproduction}

^{E) echinoderms --> bilateral symmetry as a larva, radial symmetry as adult}

Answer: E

^{Which of the following describes the most likely order of events in allopatric speciation?}

^{A) genetic drift --> genetic isolation--> divergence}

^{B) genetic isolation--> divergence--> genetic drift}

^{C) divergence--> genetic drift--> genetic isolation}

^{D) genetic isolation --> genetic drift--> divergence}

Answer: D

^{In the figure below, which two main clades branch from the most recent common ancestor of the eumetazoans}

^{A) Porifera and Cnidaria}

^{B) lophotrochozoa and ecdysozoa}

^{C) ecdyzoa and deuterosoia}

^{D) cnidaria and bilateria}

^{E) deuterostomia and bilateria}

Answer: D

^{Which phylum is characterized by animals that are assymetric and are diploblastic?}

^{A) Cnidaria}

^{B) Platyhelminthes}

^{C) Mollusca}

^{D) Nematoda}

^{E) Porifera}

Answer: E

^{Which of the following is true of the class, Hexapoda?}

^{A) All of them undergo complete metamorphosis}

^{B) They all have jointed appendages and a radula}

^{C) They have a chitinous exoskeleton}

^{D) Their bodies are divided into cephalothorax stomach}

Answer: C

^{During embryological development, the anus forms before the mouth in:}

^{A) snails}

^{B) vertebrates}

^{C) flatworms}

^{D) arthropods}

^{E) annelids}

Answer: B

^{If the half-life of carbon-14 is about 5,730 years, then a fossil that has 1/8 the normal proportion of carbon-14 to carbon-12 should be about how many years old?}

^{A) 2,800}

^{B) 11,200}

^{C) 17,190}

^{D) 22,900}

^{E) 28,650}

Answer: C

^{The worms in ___ (phylum) occur in raw meats, have a pseudocoelom, an alimentary canal, and an outer covering that shed during molting}

^{A) Platyhelminthes}

^{B) Arthropoda}

^{C) Nematoda}

^{D) Annelida}

^{E) Mollusca}

Answer: C

^{During animal development, the true coelom develops?}

^{A) between the ectoderm and mesoderm}

^{B) within the ectoderm}

^{C) between the mesoderm and endoderm}

^{D)within the mesoderm}

^{E) within endoderm}

Answer: D

^{Which of the following does not belong to the phylum Platyhelminthes?}

^{A) flukes}

^{B) tapeworms}

^{C) roundworms}

^{D) planaria}

Answer: C

^{Cribrostatin is a substance that has the potential for use in cancer therapy as well as an antibiotic. This compound naturally found in animals belonging to which of the following phyla?}

^{A) Poriferan}

^{B) Cnidarian}

^{C) Myriapoda}

^{D) Echinodermata}

^{E) Mollusca}

Answer: A

^{Which of the following is not a characteristics of all animals?}

^{A) they are all multicellular}

^{B) they have tissues, organs and organ systems}

^{C) they are eukaryotes}

^{D) they are heterotrophic}

^{E) they ingest their food}

Answer: B

^{Which two scientists hypothesized that the early earth atmosphere was reducing?}

^{A) Miller and Urey}

^{B) Gould and Eldredge}

^{C) Oparin and Haldane}

^{D) Watson and Franklin}

^{E) Huxley and Mayr}

Answer: C

Which of the following is not a pancrustachean?

A) crayfish

B) spider

C) butterfly

D) lobster

E) beetle

Answer: B

He was the prominent 20th century biologist who formulated the biological species concept that based on the ability of organisms to interbreed

A) Stephen Gould

B) Charles Darwin

C) Alfred Wallace

D) Konrad Lorenz

E) Ernst Mayr

Answer: E

Ecdysozoans include all the following except:

A) insect

B) nematodes

C) lobsters

D) sea urchins

E) scorpions

Answer: D

Book lungs are characteristics of the respiratory organs of which animal group?

A) spiders

B) lobsters

C) horseshoe crabs

D) centipedes

E) crayfish

Answer: A

What does the biological species concept use as the primary criterion for determining species boundaries?
A) geographic isolation
B) niche differences
C) gene flow
D) morphological similarity
E) molecular (DNA, RNA, protein) similarity

Answer: C

Assuming a continuous rate of sediment deposition, which section of seafloor crust should have the thickest layer of overlying sediment

A) A

B) B

C) C

D) D

E) E

Answer: E

The teacher and class were especially saddened when the colonial hydrozoan died. They had watched it carefully, and the unfortunate creature never even got to produce offspring by budding. Yet, everyone was elated when Tommy (now recovered) noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony. The teacher was apparently unaware that these hydrozoans exhibit
A) spontaneous generation.
B) abiogenesis.
C) alternation of generations.
D) ecdysis.
E) a medusa stage.

Answer: E

The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following most directly favors the evolution of the latter, more radical, kind of metamorphosis?
A) natural selection of sexually immature forms of insects
B) changes in the homeobox genes governing early development
C) the evolution of meiosis
D) the development of an oxidizing atmosphere on Earth
E) the origin of a brain

Answer: B

Which characteristic(s) is (are) shared by both cnidarians and flatworms?
A) dorsoventrally flattened bodies
B) true muscle
C) radial symmetry
D) a digestive system with a single opening

Answer: D

Which tree depicts the microsporidians as a sister group of the ascomycetes?

A) I

B) II

C) III

D) IV

Answer: A

If you were using cladistics to build a phylogenetic tree of cats, which of the following would be the best outgroup?

A) lion

B) domestic cat

C) dog

D) leopard

E) cheetah

Answer: C

A character that evolved in a group after it had branched from a common ancestor is known as ____

A) Ancestral character

B) analogous character

C) Homologous character

D) Derived character

E) Exaptation

Answer: D

More species have been extinct from this group than from any other animal group

A) echinoderm

B) mullusca

C) arthropoda

D) nematode

E) myriapoda

Answer: B

Whatever its ultimate cause(s), the Cambrian explosion ushered in ____

A) mass extinction

B) evolutionary stasis

C) adaptive radiation

D) a large meteor impact

E) animal migration from aquatic to terrestial environment

Answer: C

Which tissue type or organism is not correctly matched with its germ layer?

A) nervous --> mesoderm

B) muscular --> mesoderm

C) stomach --> endoderm

D) skin --> ectoderm

E) skeletal --> mesoderm

Answer: A

An organism that exhibits cephalization probably is also ____

A) bilaterally symmetrical

B) a coelomate

C) segmented

D) diploblastic

E) asexual

Answer: A

Plant species A has a diploid number of 12. Plant species B has a diploid number of 16. A new species, C, arises as an allopolyploid from A and B. The diploid number for species C would probably be
A) 12.
B) 14.
C) 16.
D) 28.
E) 56.

Answer: D

What do both nematodes and arthropods share in common?

A) develop an anus from the blastopore (pore) formed in the gastrula stage

B) they are suspension feeders

C) they grow by shedding their exoskeleton

D) they have ciliated larvae

E) they have a closed circulatory system

Answer: C

The largest clade in lophotrochozoan are the:

A) bryozoans

B) bivalves

C) ectoprocta

D) molluses

E) platyhelminthes

Answer: D

Three populations of the finches look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?

A) a temporal reproductive isolating mechanism

B) a postzygotic isolating mechanism

C) a behavioral reproductive isolating mechanism

D) a gametic reproductive isolation mechanism

E) habitat reproductive isolation

Answer: C

Based on phylogenetic relationships you would group the creature below with :

A) Lobster

B) Spider

C) Centipedes

D) Millipedes

E) Insects

Answer: B

Which insect order is shown in the figure below?

A) Diptera

B) Coleoptera

C) Lepidoptera

D) Hymenoptera

E) Orthoptera

Answer: B

Which of the letter correspond to a gastropod mollusk?

A) E

B) D

C) C

D) B

E) A

Answer: A

Which letter shows an organism that has Tubellaria as one of its members?

A) E

B) D

C) C

D) B

E) A

Answer: C

Which letter indicates an organism that can be grouped together with the oyster?

A) E

B) D

C) C

D) B

E) A

Answer: E

Which letter shows an organism in the phylum Nematoda?

A) E

B) D

C) C

D) B

E) A

Answer: D

What is the common name of the organism shown in letter D above?

A) Roundworm

B) Pinworm

C) Tapeworm

D) Earthworm

Answer: D