Why do some leaves change color (red, yellow, orange, etc.) in the fall?
A) The chlorophyll molecule is modified to absorb different wavelengths of light.
B) The chlorophyll molecule breaks down and other pigments now become visible.
C) When leaves die, the chlorophyll molecules are no longer visible.
D) Cold weather denatures the chlorophyll molecule, and it begins to reflect different colors.
B
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What characteristic would the R groups of amino acids have if they are located within the interior of biological membranes?
A. The R groups would be able to form ionic bonds. B. The R groups would be polar. C. The R groups would hydrophobic. D. The R groups would be hydrophilic.
Why didn't Darwin's contemporaries readily accept his theory of natural selection?
a. There was strong evidence for inheritance of acquired traits. b. There was a lack of fossil evidence. c. Darwin did not provide a plausible theory of heredity. d. There was strong evidence for the principle of use and disuse. e. Darwin did not provide evidence for artificial selection
In the process of quorum sensing, bacteria release signal molecules in _____ concentration as cell
density _____.
a. increasing; decreases d. decreasing; decreases b. increasing; increases e. a constant; increases c. decreasing; increases
All of the following are true of methanogens EXCEPT
A. they live in swamps and marshes. B. they produce methane from CO2 and H2. C. they live in the intestinal tracts of cows, humans, and termites. D. they require hot, acidic environments for methanogenesis. E. their biogas may contribute to global warming.