Two new species of plants that are morphologically similar (same leaf type, similar reproductive structures, etc.) are discovered. The botanist who discovers these plants determines that one species possesses sixteen chromosomes and the other species has thirty-two chromosomes. Both plants contain multiple sets of the same eight distinctly different chromosomes. The most probable explanation for these findings is that the second plant evolved from the first by
A. divergent evolution.
B. convergent evolution.
C. adaptive radiation.
D. polyploidy.
D. polyploidy.
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The Human Microbiome Project is a large research program that aims to understand all of the microorganisms on and in the human body. Which "-omic" methods could be applied directly to a sample from the human body to study the microorganisms in t
Propose a general experimental approach for analyzing a sample containing a complex mixture of microorganisms. What will be an ideal response?
Using the great lubber grasshopper as a model, Walter Sutton observed:
A. separation of maternal and paternal chromosomes during mitosis. B. replication of chromosomes during meiosis. C. crossing over of homologous chromosomes. D. pairing of homologous chromosomes during mitosis. E. pairing of homologous chromosomes during meiosis.
A microbiology student with a visual disability is viewing a sample of Bacillus endospores in a phase contrast microscope that is linked to an iPad. By "stretching" the image on the iPad screen, the student can increase the apparent size of the endospores. How does this manipulation affect resolution and contrast? (No software is being used to alter the image!)
A. Resolution and magnification will decrease because the screen is not as good as the human eye. B. Only the magnification can be increased; resolution and contrast are unchanged. C. Both magnification and resolution increase; contrast is unchanged. D. Contrast will improve because the microscope is phase-contrast.
In insects and spiders, __________ take up fluid, uric acid, and solutes from the blood and deliver
them to the gut. Fill in the blank(s) with the appropriate word(s).