What do gametes, spores, and the gametophyte generation have in common?
A. They are all diploid.
B. They are all haploid.
C. They are present in vascular plants only.
D. They are all produced by meiosis.
E. They are all triploid.
Answer: B
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Which of the following forms a protective layer outside of the plasma membrane of the plant cell?
A. cell wall B. cellulose C. chitin D. pectin E. proteoglycans
What is the combined function of the malleus, incus, and stapes?
a. convert the mechanical vibration of the tympanic membrane into a pressure wave in the cochlear duct b. amplify the vibrations of the ear drum c. equalize the pressure on both sides of the tympanic membrane d. convert the oval window's vibrations into vibrations of the tympanic membrane e. dampen the vibrations of the tympanic membrane
Which of the following statements concerning radiolarians is FALSE?
a. They lack shells. b. They are actinopods. c. They are rhizarians. d. They have axopods. e. They are important constituents of plankton.
Which of the following animals is a genetic male?
A. honeybee diploid B. grasshopper XO C. bird ZW D. Drosophila XXY