__________, products of master genes, act as long-range signals that diffuse out from a source and form a concentration gradient.
Fill in the blank(s) with the appropriate word(s).
Morphogens
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In a hypothetical study, equal numbers of marked dark and light moths are released in polluted and unpolluted woodlands and recaptured 10 days later. According to the industrial melanism hypothesis, which of the following results is unexpected?
A. More marked dark moths should be recaptured in polluted woodlands than in unpolluted woodlands. B. Fewer marked light moths should be recaptured in polluted woodlands than in unpolluted woodlands. C. Fewer marked dark moths should be recaptured in unpolluted woodlands than in polluted woodlands. D. More marked light moths should be recaptured in unpolluted woodlands than in polluted woodlands. E. Fewer unmarked dark moths should be captured in polluted woodlands than unmarked light moths.
The concept of an ecosystem differs from that
of a community in that, unlike the community, the ecosystem includes the a. producers. b. decomposers. c. physical environmental factors. d. animals as well as the plants. e. parasites.
Homeostasis in living organisms involves processes that:a
provide for unlimited growth. b. allow unrestricted movement. c. allow for adaptation to a harmful environment. d. permit a response to stimuli from either the internal or external environment. e. maintain a constant internal environment.
Why is the pasta you buy from the grocery store shelf considered a non-perishable food?
A. It has a low nutritional content. B. It was sterilized during preparation. C. The low moisture content prevents microbial growth. D. Various preservative chemicals are added. E. Microbes present in the pasta inhibit the growth of harmful microbes.