Which type of microscopy has the greatest resolving power?
A) electron microscopy
B) phase-contrast microscopy
C) fluorescence microscopy
D) digital video microscopy
E) confocal scanning microscopy
Answer: A
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Select the statement that is correct regarding Chagas disease.
A. It is caused by a fungal pathogen. B. Late-stage disease is characterized by autoimmune reactions in the host. C. An effective vaccine is available for prevention in endemic areas. D. It is transmitted by respiratory droplets.
Which of the following choices regarding fixed action patterns is incorrect?
a) A fixed action pattern can be potentially maladaptive. b) Fixed action patterns are innate behaviors. c) Once it is triggered, a counter-stimulus could halt a fixed action pattern. d) Fixed action patterns require no learning. e) A fixed action pattern of one organism can be exploited for the benefit of another.
Who is credited with proposing that prebiotic chemical conditions could lead to the evolution of complex molecules and, eventually, to living organisms?
A) Alexander Oparin and John Haldane B) Stanley Miller C) Francisco Redi D) Louis Pasteur E) Sidney Altman
These two figures illustrate two lineages with two variants, with and without a black spot. In all situations, a split illustrates the descendants of an individual. In which situation can natural selection work?
a. In the diagram on the left, because natural selection has eliminated the spotted variant. b. In the diagram on the left, because the number of offspring produced is independent of muta-tion. c. In the diagram on the right, because variation is heritable. d. In the diagram on the right, because mutation does not influence reproduction.