Organismic Biology Exam 1

Front 1

True or False: Some of the earliest animals to evolve a terrestrial lifestyle are Platyhelminthes in the Class Turbellaria.

Back 1

True

Front 2

True or False: Lophotrochozoans have diploblastic germ layers and have representatives with each of these 3 body plans: a coelomate, pseudcoelomate, and coelomate (but with a divided coelom).

Back 2

False

Front 3

True or False: Cephalization is the concentration of sensory organs at the posterior end of an organism.

Back 3

False

Front 4

True or False: The parasitic Phylum Acanthocephala which resides in the small intestine of vertebrates has a temporary anus.

Back 4

False

Front 5

True or False: Protozoans/Protists include organisms that are capable of photosynthesis (heterotrophs) and organisms that are consumers (autotrophs).

Back 5

False

Front 6

True or False: Sponges are thought to have arisen from choanoflagellates, a type of protozoan that has a collar and a flagellated tail for locomotion.

Back 6

True

Front 7

True or False: The simplest level of organizational complexity is the cellular level.

Back 7

False

Front 8

True or False: Macroevolution is the study of lineage formation that occurs over long periods of time

Back 8

True

Front 9

True or False: In the scientific method, repeated tests of theory with experimental and comparative methods may eventually lead to a body of knowledge that supports a well-developed hypothesis about the natural world.

Back 9

False

Front 10

True or False: Placozoa are multicellular animals with 4 tissue types and reproduce both sexually and asexually.

Back 10

False

Front 11

True or False: Platyhelminthes in the Class Cestoda have the derived trait of no digestive system.

Back 11

True

Front 12

True or False: Phylum Cycliophora contains only 3 species, and the habitat of each is confined to the mouthparts of lobsters.

Back 12

True

Front 13

True or False: One advantage of pseudocoelomates over a coelomates is that pseudocoelomates have more flexibility and mobility.

Back 13

True

Front 14

True or False: Free-living flatworms in marine habitats must osmoregulate, and evolved the protonephridia with specialized flame cells.

Back 14

False

Front 15

True or False: Taxonomy is the study of evolutionary relationships.

Back 15

False

Front 16

True or False: Conjugation in ciliate protozoans is a type of sexual reproduction.

Back 16

True

Front 17

True or False: Sexual reproduction increases genetic diversity, and increased genetic diversity increases fitness in a changing environment.

Back 17

True

Front 18

True or False: Analogous features share a common ancestor.

Back 18

False

Front 19

True or False: Some jellyfish have eyes that help them sense their prey.

Back 19

True

Front 20

True or False: The mesodermal parenchyma of a coelomates is a jelly filled space that lacks cells and organs.

Back 20

False

Front 21

True or False: Animals in Phylum Platyhelminthes are thought to have arisen from a worm-like ancestor that resembled a parenchyma larvae of the sponges.

Back 21

False

Front 22

True or False: The seudocoelomate Phylum, Rotifera, is characterized by animals with a blind gut (no anus).

Back 22

False

Front 23

An open circulatory system is characterized by
A) Fluids circulating in the coelom
B) Fluids circulating in vessels
C) Diffusion across the external membrane
D) Extracellular digestion
E) Intracellular digestion

Back 23

A) Fluids circulating in the coelom

Front 24

The specialized stinging cells of jellyfish are called:
a) Cnidocils
b) Nematocysts
c) Choanocytes
d) Cnidocytes
e) Colloblasts

Back 24

d) Cnidocytes

Front 25

Choanocytes are cells characterized by ______, and help sponges ______.
a) Crystalline structures, support themselves
b) A tube shape, draw in water to the chambers and canals
c) Amoeboid shape, phagocytise food particles
d) Flattened shape, protect themselves from the outside environment.
e) Beating flagella, collect food.

Back 25

e) Beating flagella, collect food

Front 26

Platyhelminthes have a more complex body plan than Cnidarians with a muscular pharynx and protonephridia, but Platyhelminthes still lack ____________.
a) A mouth
b) Specialized sensory cells
c) Paired nerve cords
d) An anus
e) Flame cells

Back 26

d) An Anus

Front 27

Triploblastic animals have a third dermal type called ______, which is not found in diploblastic animals.
a) Mesoglea
b) Mesohyl
c) Mesoderm
d) Metazoan
e) Metaderm

Back 27

c) Mesoderm

Front 28

Darwin’s idea of Natural Selection was based on five observations. Which of the following points is NOT part of his development of the idea of Natural Selection?
a) Organisms have limited reproductive potential
b) Populations exhibit logistic growth
c) Environments have a population carrying capacity
d) All organisms show individual variation
e) Individual variation is heritable and is passed on to offspring

Back 28

a) Organisms have limited reproductive potential.

Front 29

Development of which of the following traits is an example of convergent evolution in animals?
a) Bilateral symmetry
b) Pseudocoelom
c) Nematocysts
d) Canal system of Sponges
e) Radial pattern of cleavage in Deuterostomes

Back 29

b) Pseudocoelom

Front 30

The most complex body plan of sponges is ______, which is characterized by many chambers leading to canals.
a) Asconoid
b) Osculum
c) Leuconoid
d) Radial
e) Bilateral

Back 30

c) Leuconoid

Front 31

The current biodiversity crisis has provoked some geologists to name the current geologic era the _________.
a) Plestocene
b) Pliocene
c) Anthropocene
d) Cretaceous
e) Cenozoic

Back 31

c) Anthropocene