The polyp form of a sea anemone resembles an upside-down medusa form of a:
a) flatworm.
b) nematode.
c) coral.
d) jellyfish.
e) sponge.
Answer: d) jellyfish.
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Predict the change in surface area and volume of a spherical cell if the diameter of the cell doubles:
A. The surface area will increase by a factor of 4, while the volume will increase by a factor of 8. B. The surface area will increase by a factor of 8 while the volume will increase by a factor of 4. C. The surface area will increase by a factor of 2 and the volume will increase by a factor of 4. D. The surface area and volume will both increase by a factor of 4.
Four of the following statements are true of xylem. Which one is the exception?
a. conducts water up the plant b. conducts mineral ions up the plant c. connects with roots d. connects with leaves e. transports sugars
Which endocrine gland is the main center for control of the internal environment?
a. pineal b. hypothalamus c. thyroid d. adrenal cortex e. thalamus
Which structure is not a major diagnostic feature of the chordates?
a. dorsal hollow nerve cord. b. notochord. c. pharyngeal gill slits. d. vertebral column.