Lipids that form membranes have what kind of structure?
A) completely nonpolar, because they are lipids
B) completely polar, which allows them to dissolve in water
C) polar heads and nonpolar tails; the nonpolar tails interact with water
D) polar heads and nonpolar tails; the polar heads interact with water
Answer: D
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Signal molecules that determine relative positions during development are known as
A. inductors. B. organizers. C. cadherin domains. D. derepressers. E. morphogens.
According to a 2003 study performed by Michelle Khan and her coworkers, the rate of cervical cancer appears to be
the greatest when women are ____.
a. positive for HPV 16 b. negative for HPV16 but positive for HPV18 c. negative for HPV16/18 but positive for other cancer-causing HPV d. negative for all cancer-causing HPV e. positive for HIV
Which of the following is true?
a. Eukaryotes are smaller than prokaryotes. b. Prokaryotes are smaller than eukaryotes. c. Prokaryotes and eukaryotes are approximately the same size. d. Most prokaryotes are larger than eukaryotes, but not all.
Some frogs exhibit bright coloration to warn predators of toxins in their skins. What is this called?
a. biomimetic color production b. biomimicry c. aposematic coloration d. synthetic photonics