BIO 152 FINAL EXAM QUESTIONS BANK

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BIO 152 FINAL EXAM QUESTIONS BANK

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BIO 152 FINAL EXAM

Which phylum is characterized by animals that have a segmented body?

• Cnidaria
• Platyhelminthes
• Porifera
• Arthropoda
• Mollusca - ANSWER- d. Arthropoda

The water vascular system of echinoderms

• functions as a circulatory system that distributes nutrients

to body cells.

• functions in locomotion and feeding.
• is bilateral in organization, even though the adult animal 1 / 4

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is not bilaterally symmetrical.

• moves water through the animal's body during suspension

feeding.

• is analogous to the gastrovascular cavity of flatworms. -

ANSWER- b. functions in locomotion and feeding.

Which of the following combinations of phylum and description is incorrect?

• Echinodermata—bilateral symmetry as a larva, coelom

present

• Nematoda—roundworms, pseudocoelomate
• Cnidaria—radial symmetry, polyp and medusa body forms
• Platyhelminthes—flatworms, gastrovascular cavity,

acoelomate

• Porifera—gastrovascular cavity, coelom present - ANSWER-
• Porifera—gastrovascular cavity, coelom present

In Figure 33.2 (page 666), which two main clades branch from the most recent common ancestor of the eumetazoans?

• Porifera and Cnidaria
• Lophotrochozoa and Ecdysozoa 2 / 4

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• Cnidaria and Bilateria
• Rotifera and Deuterostomia
• Deuterostomia and Bilateria - ANSWER- c. Cnidaria and

Bilateria

In Figure 33.8 (page 673), assume that the two medusae shown at step 4 were produced by one polyp colony.Review Concept 12.1 (pp. 229-230) and Concept 13.4 (pp. 257-260), and then use your understanding of mitosis and meiosis to evaluate whether the following sentence is true or false. If false, select the answer that provides the correct reason.Although the two medusae are genetically identical, a sperm produced by one will differ genetically from an egg produced by the other.

• F (the medusae are genetically identical, but so are the

gametes)

• F (neither the medusae or the gametes are genetically

identical)

• F (the medusae are not identical but the gametes are)
• T - ANSWER- d. T

The archenteron develops into 3 / 4

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• the mesoderm.
• the blastocoel.
• the endoderm.
• the placenta.
• the lumen of the digestive tract. - ANSWER- e. the lumen of

the digestive tract.

What happens when a resting neuron's membrane depolarizes?

• There is a net diffusion of Na out of the cell.
• The equilibrium potential for K (EK) becomes more positive.
• The neuron's membrane voltage becomes more positive.
• The neuron is less likely to generate an action potential.
• The cell's inside is more negative than the outside. -

ANSWER- c. The neuron's membrane voltage becomes more positive.

A common feature of action potentials is that they

• cause the membrane to hyperpolarize and then depolarize.
• can undergo temporal and spatial summation.
• are triggered by a depolarization that reaches the threshold.
• move at the same speed along all axons.
• require the diffusion of Na and K through ligand-gated
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