What do scientists consider when they perform a cladistic analysis?
a. only the DNA of organisms
b. all traits of organisms
c. derived characters
d. only physical similarities
Ans: c. derived characters
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Birds that catch their prey by plunge diving into the water from the air are:
a. skimmers. b. cormorants. c. terns. d. penguins. e. avocets.
Biogeochemical cycles are crucial to ecosystem function because __________.
Fill in the blank(s) with the appropriate word(s).
You're a doctor visiting with a patient, and you remind her to get her flu vaccination this year. She looks at you quizzically and says, "I don't need a vaccination. I got one last year." Which of the following would be the most appropriate biological explanation?
A. " Flu vaccinations wear off after a year, so you should really get another one." B. "The flu virus evolves very rapidly, so last year's vaccination will not be as effective as this year's vaccination." C. "Well, you should be okay then." D. "Well, it is free."
Integrins are
a. transmembrane proteins. b. peripheral membrane proteins. c. components of the extracellular matrix. d. components of a desmosome.