BIOLOGY 109 UNIT #1 EXAM
QUESTIONS AND ANSWERS
While scuba diving, a Bio 109 student observes a large marine invertebrate crawling
past her at a leisurely pace. Neither segmentation nor jointed appendages are
observed, but a pair of large, well-developed eyes is evident. The animal has no
visible shell. The student is observing an animal belonging to which phylum? -
ANSWER-mollusca
An evolutionary innovation that first appears with the annelids - ANSWER-
segmentation
What would be the most effective method of reducing the incidence of blood flukes in
human populations? - ANSWER-reduce the freshwater snail population
A mantle is to mollusc as a(n) is to a brachiopod - ANSWER-lophophore
Which of the following combinations of phylum and description is incorrect? -
ANSWER-arthropod-closed circulatory system, lophophore
A student from another university (west of the state line) was arguing with your friend
that Cnidarians have a true coelom. You interjected, "That's impossible. They " -
ANSWER-are diploblastic
You are trying to identify an organism. It is an animal, but it does not have nerve or
muscle tissue. It is neither diploblastic nor triploblastic. It is probably a(n) -
ANSWER-sponge
At which developmental stage should one be able to first distinguish a diploblastic
embryo from a triploblastic embryo? - ANSWER-gastrulation
A graduate student finds an organism in a pond and thinks it is a freshwater sponge.
A postdoc thinks it looks more like an aquatic fungus. How can they decide whether
it is an animal or a fungus? - ANSWER-look for cell walls under a microscope
Which of the following is not considered a contributor to the explosion diversification
of animal body plans that occurred during the Cambrian period? - ANSWER-
formation of the supercontinent, Pangea
You have been assigned the task of locating living members of the phylum
Glomeromycota. Where is the best place to look? - ANSWER-in the roots of vascular
plants
Which of the following associations is not an example of symbiosis? - ANSWER-a
saprobe that absorbs nutrients from nonliving organic material
, Which of the following statements concerning human evolution is correct? -
ANSWER-fossil evidence indicates that early anthropoids were arboreal, and cat-
sized
The discovery of the fossil Archaeopteryx supports the hypothesis that - ANSWER-
birds are the modern animals that share the most recent ancestor with the dinosaur
The adaptive radiation of following the Cretaceous extinctions filled niches vacated
by the dinosaurs - ANSWER-mammals
The hypothesis that the appendages of the tetrapods first evolved for walking
underwater would be supported by the fossil evidence that Achanthostega (a
Devonian tetrapod) had - ANSWER-gills
Lampreys and hagfishes are similar in that they both - ANSWER-lack jaws
have a notochord
have a cranium
lack paired appendages
Which of these are characteristics of all chordates during at least a portion of their
development? - ANSWER-a dorsal, hollow nerve cord
pharyngeal clefts
post-anal tail
Which of the following is not a characteristic feature of the Chordata? - ANSWER-a
bony skeleton of calcium phosphate
The heartworms that can accumulate within the heart of dogs and other mammals
have a pseudocoelom, an alimentary canal, and an outer covering that is
occasionally shed. To which phylum does the heartworm belong? - ANSWER-
nematoda
A new species of aquatic invertebrates is discovered anchored by a thick stalk to
pilings on a submerged pier. In addition to the stalk, the animal also has a hard shell
of calcium carbonate and several jointed appendages, which protrude from the shell
and appear to function as filter-feeding devices. As an informed Bio 109 student you
would predict that this animal is a(n) - ANSWER-arthropod
The number of sets of chromosomes in a dikaryotic cell - ANSWER-is equal to that
in a diploid cell
Which of the following statements concerning fungi is true? - ANSWER-some fungal
species live as decomposer and others as symbionts
Of the following diseases, which are caused by kinetoplasts? - ANSWER-African
sleeping sickness
chagas disease
leishmaniasis
QUESTIONS AND ANSWERS
While scuba diving, a Bio 109 student observes a large marine invertebrate crawling
past her at a leisurely pace. Neither segmentation nor jointed appendages are
observed, but a pair of large, well-developed eyes is evident. The animal has no
visible shell. The student is observing an animal belonging to which phylum? -
ANSWER-mollusca
An evolutionary innovation that first appears with the annelids - ANSWER-
segmentation
What would be the most effective method of reducing the incidence of blood flukes in
human populations? - ANSWER-reduce the freshwater snail population
A mantle is to mollusc as a(n) is to a brachiopod - ANSWER-lophophore
Which of the following combinations of phylum and description is incorrect? -
ANSWER-arthropod-closed circulatory system, lophophore
A student from another university (west of the state line) was arguing with your friend
that Cnidarians have a true coelom. You interjected, "That's impossible. They " -
ANSWER-are diploblastic
You are trying to identify an organism. It is an animal, but it does not have nerve or
muscle tissue. It is neither diploblastic nor triploblastic. It is probably a(n) -
ANSWER-sponge
At which developmental stage should one be able to first distinguish a diploblastic
embryo from a triploblastic embryo? - ANSWER-gastrulation
A graduate student finds an organism in a pond and thinks it is a freshwater sponge.
A postdoc thinks it looks more like an aquatic fungus. How can they decide whether
it is an animal or a fungus? - ANSWER-look for cell walls under a microscope
Which of the following is not considered a contributor to the explosion diversification
of animal body plans that occurred during the Cambrian period? - ANSWER-
formation of the supercontinent, Pangea
You have been assigned the task of locating living members of the phylum
Glomeromycota. Where is the best place to look? - ANSWER-in the roots of vascular
plants
Which of the following associations is not an example of symbiosis? - ANSWER-a
saprobe that absorbs nutrients from nonliving organic material
, Which of the following statements concerning human evolution is correct? -
ANSWER-fossil evidence indicates that early anthropoids were arboreal, and cat-
sized
The discovery of the fossil Archaeopteryx supports the hypothesis that - ANSWER-
birds are the modern animals that share the most recent ancestor with the dinosaur
The adaptive radiation of following the Cretaceous extinctions filled niches vacated
by the dinosaurs - ANSWER-mammals
The hypothesis that the appendages of the tetrapods first evolved for walking
underwater would be supported by the fossil evidence that Achanthostega (a
Devonian tetrapod) had - ANSWER-gills
Lampreys and hagfishes are similar in that they both - ANSWER-lack jaws
have a notochord
have a cranium
lack paired appendages
Which of these are characteristics of all chordates during at least a portion of their
development? - ANSWER-a dorsal, hollow nerve cord
pharyngeal clefts
post-anal tail
Which of the following is not a characteristic feature of the Chordata? - ANSWER-a
bony skeleton of calcium phosphate
The heartworms that can accumulate within the heart of dogs and other mammals
have a pseudocoelom, an alimentary canal, and an outer covering that is
occasionally shed. To which phylum does the heartworm belong? - ANSWER-
nematoda
A new species of aquatic invertebrates is discovered anchored by a thick stalk to
pilings on a submerged pier. In addition to the stalk, the animal also has a hard shell
of calcium carbonate and several jointed appendages, which protrude from the shell
and appear to function as filter-feeding devices. As an informed Bio 109 student you
would predict that this animal is a(n) - ANSWER-arthropod
The number of sets of chromosomes in a dikaryotic cell - ANSWER-is equal to that
in a diploid cell
Which of the following statements concerning fungi is true? - ANSWER-some fungal
species live as decomposer and others as symbionts
Of the following diseases, which are caused by kinetoplasts? - ANSWER-African
sleeping sickness
chagas disease
leishmaniasis
