Which term is given to the measure of the proportion of offspring that a particular phenotype will contribute to the next generation?
What will be an ideal response?
fitness
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Which of the following is an example of a commensalism?
A) fungi residing in plant roots, such as endomycorrhizae B) bacteria fixing nitrogen in plants C) rancher ants that protect aphids in exchange for sugar-rich honeydew D) cattle egrets eating insects stirred up by grazing bison
Genetically modified food has raised some concerns because
A. it contains radioactive particles. B. it may contain some unanticipated allergens. C. it may have some unintended environmental effects. D. the modified DNA may transfer to other organisms. E. it may contain some unanticipated allergens, it may have some unintended environmental effects, AND the modified DNA may transfer to other organisms.
Thioglycolate medium contains the following: yeast extract, pancreatic digest of casein, glucose, L-cysteine, sodium chloride, sodium thioglycolate, and agar. It is considered a complex medium because
A. depending on their oxygen utilization pattern, organisms will grow differently on it. B. thioglycolate has a carbon-sulfur bond that many microbes cannot break enzymatically. C. it has multiple ingredients for a broad range of nutrients. D. both yeast extract and pancreatic digest of casein are not chemically defined.
When membrane lipids are extracted from cells and used to prepare artificial lipid bilayers, cholesterol and sphingolipids tend to self-assemble into ________ that are more gelated and highly ordered than surrounding regions consisting primarily of _________.
a) microdomains, integral proteins b) microdomains, phosphoglycerides c) liquid crystals, microdomains d) liquid crystals, phosphoglycerides e) macrodomains, phosphoglycerides