BIO 170 - Third Exam - Spring 2016
Links go to pertinent passages of book.

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 are radially symmetrical?

                a. Roundworm and annelid             b. Spider and beetle            c. Clams and sea urchins
                d. Jellyfish and starfish                            e. Oh, so that’s how it’s going to be…

_______ 2.  A syncytium would be a necessary step in

                a. Germination         b. Multiple fission         c. Budding        d. Binary fission
                        e. Nothing that weird-sounding should ever be necessary

_______ 3.  A swim bladder is used to

                a. Remove wastes         b. Supply propulsion        c. Adjust buoyancy
                d. Disperse larvae                    e. I don’t even want to know, it sounds gross…

_______ 4.  Which of these is inversely proportional (smaller correlates with larger)?

                a. Sperm numbers and egg cell numbers
                b. Number of offspring and odds of their survival
                c. Fungal species in an ecosystem and plant species in that system
                d. Number of metameres and overall complexity
                e. Closeness of exam and number of functioning brain cells

_______ 5.  Cestodes (tapeworms) are in the same phylum as

                a. Hydra             b. Clams             c. Earthworms             d. Planaria
                                        e. They make tape out of worms-?

_______ 6.  What is the significance of the trochophore larva?

                a. It exhibits both protostome and deuterostome characteristics
                b. It connects several phyla that aren’t obviously connected
                c. It follows a “typical” development pattern for research
                d. All of the above
                e. It got mentioned in the class, for some reason

_______ 7.  A mantle cavity would be found in a

                a. Snail         b. Spider         c. Coral         d. Sponge        e. Fireplace?

_______ 8.  Oxygen debt occurs in

                a. Respiratory systems         b. Protostomes        c. Deuterostomes         d. Skeletal muscle
                                                            e. Some very strict banking systems

_______ 9.  Metamerism is a feature, sometimes just in embryos, of

                a. Beetles, earthworms, starfish                     b. Crayfish, marine worms, human
                c. Roundworms, snails, spiders                     d. Leeches, freshwater worms, flatworms
                                e. A lot of critters that go squish when you step on them

_______ 10.  The two major subgroups of fungi differ primarily in

                a. Defensive chemistry             b. Ecological role            c. Spore production
                d. Multicellular organization                e. Just how much fun they really are

_______ 11. Which would be a chelicerate?

                a. Crayfish         b. Leech         c. Fluke         d. Spider        e. Sounds kind of yummy

_______ 12. The most dangerous damage from a schistosome infection comes from

                a. Wandering eggs         b. Host immune reaction        c. Wandering larvae
                d. Parasite toxins        e. Attempting to tell people and accidentally spitting on them

_______ 13. Which are primarily connective tissue?

                a. Sense receptors and cartilage         b. Tendons and muscles        c. Blood and bone
                d. Lungs and heart                                    e. Staples and masking tape

_______ 14. A water vascular system is found in

                a. Clams         b. Sponges         c. Starfish        d. Annelids         e. Something very juicy

_______ 15. The intermediate host for malaria:

                a. Humans                 b. Viruses                 c. Mosquitos       
                d. Can be any of the above                         e. Whoever’s got the tiny couch

_______ 16. Ligaments

                a. Can store energy for release later            b. Are structurally almost identical to tendons
                c. Stabilize endoskeletal joints                    d. All of these
                        e. Figure into a large percentage of sports stories

_______ 17. Neurotransmitters

                a. Move an impulse along a neuron                            b. Convert sensory input to a nerve impulse
                c. Keep the “wiring” of a nervous system active          d. Carry messages across synapses
                                    e. Are the next step in cell phone technology

_______ 18. Caenorhabditis elegans

                a. Has been used to find HOX genes                b. Is an important protozoan parasite
                c. Is an important nematode parasite                d. Has been used to “train” immune systems
                                            e. Makes spelling bee contestants cry

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.  Why are flatworms flat?

2.  What are two different functions that could be done by accessory sexual organs?


3.  What are the two major functions of the lymphatic system?


4.  Briefly explain how being monoecious is an advantage even without self-fertilization.

5.  A) What is cephalization?   B) What other, apparently separate feature is connected to it?

6.  What is the function of contractile vacuoles?

7a. What germ layer was the last to evolve in animals?

7b. What are two organ systems that mostly derive from that germ layer?

8.  Briefly explain how conjugation in ciliates is a form of suicide.

9.  What are the two major functions of the notochord?


10. What are two different advantages for a tube digestive system over a sac system?


11. What two processes “stall” or delay the meiotic divisions of egg cell production in mammals?


12. What are two general niches commonly occupied by fungi?


13. What is the basic physical distinction of epithelial tissue?

14. Some sponges use fragmentation – explain what that means.

15.  Two different systems whose features tend to repeat in metameres:


16. Two different reasons why capillaries are leaky.


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.  Give three sets of differences between -




2.  What are the four growth zones of a fungus?



3.  For each of the four protozoan subgroups, give the official name and the main mode of locomotion typical for that group.





4.  What are six different functions of integument?



5.  For each type of skeleton, give two different advantages, compared to the other -



6.  For each of the four muscle subtypes, give the subtype and one feature that makes that subtype different from the other three.




7.  What are four features of sponges and cnidarians that are not found (or are very rare) in the other major animal phyla?



8.  What are four major subgroups of the mandibulate arthropods?



Link to Answer Key


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.

Where is one likely to find rhizomorphs? Three Points.

What’s the first step toward “tossing” fungal spores out into the air? Three Points.

Yeasts have been used for a lot of basic, non-commercial science. In what area? Three Points.

What unusual thing does a slime mold do when conditions get bad? Three Points.

What advantage do aquatic animals get from internal fertilization, in situations where eggs are quickly deposited in the open environment? Three Points.

In humans, what non-ball shape is a blastula (Two Points), and why is it that shape? (Three Points)

What unusual ability did McDarby’s experimental worms show that they should not have had the brainpower for? Three Points.

Why are there probably more species of roundworms than species in any other phylum? Three Points.

If an open circulation system has vessels, what type of vessels would it most likely be?
Three Points.

What two cellular factors strongly influence the evolution of human skin color? Three Points Each


BIO 170

Michael McDarby


Hit Counter