Which of the following is a benefit of chemical diversity to humans?
a. Increased soil productivity
b. Potential pharmaceutical and medical discoveries
c. Larger number of distinct species
d. Genetic diversity in crops used in commercial agriculture
b. Potential pharmaceutical and medical discoveries
A benefit of chemical diversity—a diverse variety of species that produce different assortments of proteins and other compounds—to humans is potential pharmaceutical and medical discoveries.
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Aerobic bacteria most likely evolved ____
a. directly from early protocells b. around hydrothermal vents c. later than cyanobacteria d. in a prebiotic soup e. through the process of endosymbiosis
Which statement about birds is true?
a. Bird feathers are modified reptilian scales. b. Bird lungs are similar to mammalian lungs. c. A bird’s primary feathers provide lift. d. Most bird species have two ovaries.
If you found a mutation, involving the loss of two bases, which was present in humans living on all four continents which you could test but was absent in close relatives such as gorillas and chimps, what would this imply?
A. Two bases were actually insertions in the nonhuman primates. B. Deletion arose before the branch between humans and nonhuman primates. C. Deletion arose in multiple nonhuman primates. D. Deletion arose at least six times in different human populations. E. Deletion arose after the branch between humans and nonhuman primates.
In Drosophila, sex is determined by a balance between the number of haploid sets of autosomes and the number of ________
A) satellited chromosomes B) Y chromosomes C) X chromosomes D) chromomeres E) centromeres