__________, 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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Which of the following are most closely related to
the choanoflagellates? a. animals b. fungi c. amoebozoans d. algae e. none of these
Why are archaea and bacteria—both collections of prokaryotic organisms—grouped into different domains while organisms like fungi and animals are in the same domain?
a. Bacteria and archaea differ significantly in their intracellular organization and structure, but fungi and animals have similar intracellular structure. b. The DNA sequences of bacteria and archaea are more different than animals and fungi. c. Fungi and animals look much more similar than bacteria and archaea. d. Bacteria and archaea differ significantly in their rRNA sequences, but fungi and animals share some rRNA characteristics.
Global warming is the result of
A) rising ocean levels. B) rising concentrations of greenhouse gases. C) increased solar activity. D) habitat loss.
One warm summer day, your uncle cuts up a big batch of chicken parts to barbecue, but then he is called away for a work-related emergency. When your aunt makes the salad several hours later, she uses the knife that your uncle left unwashed next to the sink. What might happen to you later that night, and why?