In the cellular slime mold Dictyostelium, cAMP is the signal that causes cells to ________
a. aggregate
b. all of the choices
c. change their gene expression
d. differentiate into components of a stalk or spores
b
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Identify the plants in the photo at the right as male or female, gametophyte or sporophyte, moss or liverwort.
What will be an ideal response?
Semicircular canals are associated with the:
A. lateral line system. B. tympanic membrane in insects. C. vestibular system. D. cochlea.
Which of the following represents one of the theories for the sudden change in diversity called the Cambrian Explosion?
a. sudden extreme cooling of the Earth’s climate b. asteroid impact c. rising atmospheric oxygen levels d. migration introduction of new diseases
Gymnosperms are seed plants that produce seeds ____
a. inside ovules b. on the surface of ovules c. inside fruits d. on their waxy needles e. from a microspore