BIO 170  - Third Exam  - 2021
Answer Key


Multiple Choice. 

            Place the letter of the choice that best answers the question on the line to the left. 

                        Two Points Each.   NOTE: “e” answers are never the correct answer.


_______ 1.  Which two tissue types are distinct primarily for the way they are physically set up

                                    (as opposed to being distinct based on something they can do)?

                            a.  Epithelium & connective                             b.  Nervous & reproductive

                            c.  Connective & muscle                                 d.  Muscle & nervous

                                    e.  Kleenex’s tough to remember the other tissue types... 


_______ 2.   A spicule is a

                            a.   Type of stinging cell                       b.  A structural support

                            c.   An organelle                                  d.  Part of a tapeworm

                                                e.   Great insult word 



_______ 3.   A tick would be most closely related to

                            a.  Centipede               b.  Flea            c.  Earthworm

                            d.  Scorpion                 e.  Any government official  



_______ 4.  The invertebrate chordates are largely

                            a.  Predators                                                    b.  Sessile

                            c.  Parasitic                                                      d.  Filter feeders

                                                e.  Overlooked during study sessions



_______5.  Chromatophores can be used in

                            a.   Vision and motion                                     b.   Filtering and digesting

                            c.   Camouflage and communication                d.   All forms of replacements

                                    e.   Doing the ....chromats?


_______6.  Regeneration producing individuals is not the same as fragmentation because it

                        a.  Results in fewer individuals

                        b.  Is not done deliberately

                        c.  Does not produce genetically identical individuals

                        d.  Can only be done once during a lifecycle

                        e.  Is spelled in a totally different way 



_______7.  With the evolution of mesoderm comes the appearance of

                            a.  Muscle and nerve cells                                b.   Sexual reproduction

                            c.  The one-way digestive tract                         d.   Organ systems

                                                            e.  Mesoderm implants 



_______8.  Filter feeding can occur in

                            a.  Choanocytes & mantle cavity                b.   Gastrovascular cavity & trochophore

                            c.  Trochophore & contractile vacuoles       d.  Scolex & proglottid

                                                e.  Any of the finest coffee bars  


_______9.  Synapses are a feature of

                            a.  Fertilization                           b.   Body cavities                 c.  Accessory organs

                           d.  Nervous systems                            e.   Sewer lines, I would hope  



_______10.   The mantle would be associated with

                            a.   Anemone tentacles                         b.  Clam shell

                            c.   Sponge pores                                 d.  Roundworm integument

                                    e.   Apparently, we’re not talking about fireplaces...   



_______ 11.  Bilaterally-symmetrical animals, almost by definition, also have

                            a.  Backbones                 b.  Legs                    c.  Brains                       d. Fins

                                                                        e.  Cuddly little babies

_______12.   Probably the most important aspect of a swim bladder is that it

                            a.  Could be evolved into a lung

                            b.  Gives muscles something to pull against

                            c.  Helps conserve swimming energy

                            d.  Helps draw oxygen from the water

                           e.  Does not produce detectable “warm spots” in the pool



_______13.  Tapeworms tend to be more dangerous

                            a.   When they are in the stomach                    b.   As adults

                            c.   In intermediate hosts                                 d.   As eggs

                                                e.   When they are armed



_______14. An important evolutionary development in land animals was

                            a.  A nontoxic waste material                          b.  Eggs with a jelly-like outer layer

                            c.  Cephalization                                            d.  Movement with muscle power

                                                                        e.  Nikes


_______15.  Oxygen debt can occur in    

                            a.  Gills only                           b.   Skeletal muscle                             c.  Lungs only

                           d.  Either gills or lungs                        e.  These troubled economic times



_______16.  Histology is the study of

                            a.  Organelles                          b.  Tissues                                c.  Behavior

                           d.  Classification                                 e.  Male foot projections



_______17.   Skeletal support and nutrient distribution are done by the same feature in

                            a.   Sponges                             b.   Hydras                              c.  Snails

                           d.   Roundworms                    e.   Sorry, that’s against the contract terms



_______18.  Serial homology would show up in a comparison of

                            a.  Chromosome structure                   b.  Human arms and bat wings

                            c.  Ancestors and descendants            d.  Human arms and legs

                                                e.  Cheerios and Fruit Loops

Short Answer.   

Pick NINE questions to answer in the spaces provided.

NOTE: if you answer MORE than nine, only the first nine will be corrected. 

Four Points each.   Partial credit is possible.



1. Pick two symptoms of inflammation (from redness, warmth, swelling) and tell how each is produced.










2.  What are the two layers of vertebrate integument?





3.  What are two entirely different scenarios that are benefited by internal fertilization?






4.  What are two characteristics of Cnidaria found in no other phylum?





5.  What two different classes of regulatory molecules are found in vertebrate plasma?





6.   What are two different  forms of the mollusk foot?






7.  What are two major groups from different phyla that undergo metamorphosis?






8.  What are the two major jobs of a lymphatic system?







9.  Briefly explain the significance of the trochophore larva.





10.  Why is nitrogen dissolved in blood?





11.  What an animal sperm typically enters is not and actual egg cell – it hasn’t completed the necessary meiotic divisions.  Why not?





12.  The three features of typical invertebrate nerve cords:








13.  What are the general categories of chromosome-based gender determination?






14.  What are two features found in both Porifera and Cnidaria, but not other groups?






15.  What is an open circulatory system particularly bad at?





16.  What are the stages, in order, that indirectly-developing insects go through?









Long Answer.  


Select and answer completely any four of the following questions.

Note:  if you answer more than four, only the first four will be corrected.

Seven Points Each.  Partial credit is possible.


1.  Under each of these types of skeleton systems, give two advantages that one has over the other.  Note, this is NOT asking for sets of differences!

















2.  Give six characteristics of birds that can easily be connected to flight.
























3.  For the three types of blood vessels, name the type and give one way that the vessel is structurally different from the other two.














4.  Give the four levels of organization above protoplasmic, in order of complexity, found in multicelled animals.








5.  What, generally, are six different functions of integument?
















6.  For the three germ layers, name the layer and give two different systems derived from that layer -












7.  What are the four major subcategories of the insects?









8.  Give three sets of differences.  (Don’t use the same thing under different terms.)


















Answer as many or as few as you wish.  You can't lose points on the rest of the exam by getting these wrong.  Partial credit is possible.


What animal phylum is often considered a separate kingdom?  Three Points.


What exactly is a coelom?  Three Points.



What is the evolutionary advantage of metamerism?  Three Points.



Why do Ascaris wander?  Three Points.



What parasite causes its host to want to eat dirt?  Three Points.



How did the aquarium catch the fish-stealing octopus?  Three Points.



Why would a hunting cuttlefish flash white?  Three Points.



What’s the main difference between the two insect flight systems?  Three Points.




How do starfish attack clams?  Three Points.




What two processes are at play in the evolution of human skin color?  Four Points.



What aspect of tattoos is pretty much unregulated?  Three Points.




Why is carbon dioxide not really carried in the blood?  Three Points.




BIO 170

Michael McDarby