The larva in Figure 31-4 is characteristic of:
A. arthropods.
B. mollusks.
C. cnidarians.
D. platyhelminths.
E. nematodes.
B
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Ascospores are produced in all of the following taxa EXCEPT
A) Aspergillus. B) Candida. C) Rhizopus. D) Saccharomyces.
Which cells connect different photoreceptor cells to each other?
a. optic ganglion cells b. amacrine cells c. bipolar cells d. rods and cones e. horizontal cells
What evidence supports the idea that some nuclei are totipotent?
a. Nuclei taken from the cells of an embryonic frog can direct a frog egg to develop into a tadpole. b. Nuclei taken from the cells of a frog embryo can direct any amphibian egg to develop into a tadpole. c. Nuclei taken from a different species can direct a tadpole egg to develop into a normal tadpole. d. Some cells are capable of undergoing unlimited cell cycles.
e. Some cells are capable of arresting their cell cycle at will.Which of the following experiments might disprove the "inheritance of acquired characteristics"?
a. Separate black mice from white mice. Breed black mice together and white mice together and show that children resemble their parents in color. b. Separate male mice from female mice. Race the male mice down a track. Only allow the fastest males to breed with the females. Show that the male children are no faster than their parents. c. Measure the tail lengths of a population of mice. Cut the tails off and then let them breed. Show that the children's tails are no shorter than their parents' tails. d. Take a population of white mice. Dye the hair of the mice black and show that their children are still born with white hair. e. Separate male mice from female mice. Allow males to attack one another to prove dominance. Only allow the dominant males to breed with the females. Show that the male children are no more aggressive than their parents.