Which of the following expresses an accurate difference between prokaryotic and eukaryotic cells?
A) Prokaryotes have organelles, but eukaryotes do not.
B) Prokaryotic cells are larger than eukaryotes.
C) Prokaryotes can be multicellular, but eukaryotes cannot.
D) Eukaryotes have a nucleus, but prokaryotes do not.
Answer: D
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Vesicles form during _____
a. endocytosis d. halitosis b. exocytosis e. endocytosis through phagocytosis c. phagocytosis f. all of these
__________ that impart greater __________ to an individual become more common in a population
over generations, compared with less competitive forms. Fill in the blank(s) with the appropriate word(s).
The most common outcome of the process in Figure 20-1 is no viable gametes. This happens becauseof:a
a low rate of fertilization. b. defective meiosis. c. gametic isolation. d. species incompatibility. e. hybrid inviability.
A power line cut has isolated 50 sowbugs from its original population of 15,000. After only five generations, the new population exhibits dramatic differences from the original one, most likely because
a) members of a small population tend to die off more quickly, removing alleles from the gene pool b) gene flow increases in a new environment c) the new environment is different from the old, favoring natural selection d) mutations are more common near a power line e) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool