If a larva of Echinococcus granulosus is found in humans, humans are the
A) definitive host.
B) infected host.
C) intermediate host.
D) reservoir.
E) None of the answers is correct.
C
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An important message from the work of Thomas Malthus that influenced Charles Darwin was
A. animals tended toward "human perfection." B. only a fraction of any population will survive and reproduce. C. population size of humans can only increase linearly. D. inheritance of acquired characteristics. E. none of these. Charles Darwin was influenced by John Ray not Thomas Malthus.
Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. D. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells.
How has gene duplication played a critical role in evolution?
a) It produces redundant copies of existing genes, which are then free to mutate and adopt new functions. b) It almost always introduces immediate benefits for the organism. c) It increases the amount of DNA in the genome. d) It increases the number of pseudogenes in the genome. e) It increases the likelihood of viral infection in cells.
Domestication of dogs has led to
A. a variety of homologous structures. B. a variety of different species. C. a variety of mutations. D. a variety of phenotypes. E. a variety of reproductively isolated breeds.