Why might the analysis of endosymbiotic bacterial genomes be misleading for understanding the minimal gene set?
a. They may have lost genes that would have been essential to early life-forms because they may have reduced metabolic requirements.
b. They may have gained genes to be able to live within another organism.
c. They are bacteria and therefore have nothing in common with LUCA.
d. Their genes can be disrupted by transposons.
A
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The rate at which evolution is occurring cannot be estimated by:
A. studying comparative anatomy. B. inferring that apes are related to humans. C. measuring the degree of difference in genetic coding. D. interpretation of the fossil record.
Of the following structures, which one is not a specialized cell of the epidermis?
A. guard cells B. trichomes C. sclereids D. root hairs E. oil glands
An umbrella species is a
a) popular species that the public tends to rally behind and support b) non-native species, usually introduced to an area by accident c) species whose removal will severally damage or cause the collapse of its ecosystem d) species whose protection also results in the protection of many other species e) both the third and fourth answer choices are correct
Which of the following is the correct sequence for stages of Ehrlichia development in infected host cells?
A) initial body, morula, elementary body B) morula, elementary body, initial body C) initial body, elementary body, morula D) elementary body, initial body, morula E) morula, initial body, morula, elementary body