Caulobacter produce free-swimming ________ cells for dispersal that must differentiate into _______ cells for reproduction
a. stalked / swarmer
b. peritrichous / planktonic
c. swarmer / stalked
d. persister / dormant
Answer: C
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In which of the following plants does the sporophyte eventually become self-sustaining (i.e., is not dependent on the gametophyte for nutrients)? Select all correct choices
A. mosses B. gymnosperms C. hornworts D. angiosperms E. ferns
When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other, the type of cleavage is called
A. direct cleavage. B. spiral cleavage. C. indirect cleavage. D. protostome cleavage. E. radial cleavage.
Cheetahs are cats native to the African continent. The population numbers have been drastically reduced in the past. Also, the allele frequencies of the cheetah populations are very similar, with little or no differences among populations. Individuals are virtually genetically identical. The loss of genetic variation in cheetahs is likely due to
1.a founder effect 2.a bottleneck effect 3.sexual selection 4.chance
What is the function of the generative cell in conifers?
A. Maturation of the female cone B. Production of the archegonium C. Growth of the megaspore D. Formation of the sperm E. Dispersal of the pollen