Which of the following examples of natural selection has occurred over the course of our lifetime?
A. the rise of the domain Archaea
B. the rise of different feeding habits in different species of finches on the Galápagos Islands
C. the evolution of antibiotic-resistant bacteria
D. a rise in the incidence of malaria
C. the evolution of antibiotic-resistant bacteria
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The plasma membrane of eukaryotes contains all of the following EXCEPT
A. sterols. B. peptidoglycan. C. sphingolipids. D. phosphoglycerides.
What can happen when a complement protein encounters an antibody-antigen complex marking a pathogen?
A) The protein can mark the pathogen for destruction by T cells. B) The protein can destroy the pathogen. C) The protein can coat the pathogen to inactivate it. D) The protein can remove the antibody for use elsewhere.
The ________ scale is used to measure concentrations of hydrogen ions in a solution.
Fill in the blank(s) with the appropriate word(s).
Photosynthesis Photosynthesis
a) is NOT dependent on chlorophyll. b) does NOT involve oxidation-reduction reactions. c) produces water and carbon dioxide. d) produces glucose and oxygen. e) None of the answers are correct.