The functions of microbodies include all the following EXCEPT ____
a. ATP synthesis
b. breakdown of amino acids
c. metabolism of alcohol
d. conversion of oils to sugars in plants
e. breakdown of hydrogen peroxide to water and oxygen
A
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The major difference between gram-positive and gram-negative bacteria is that:
a. the peptidoglycan layer in gram-positive bacteria is substantially thinner than in gram-negative bacteria. b. gram-positive bacteria contain a periplas-mic space, whereas gram-negative bacteria do not. c. flagella are only present in gram-positive bacteria. d. gram-negative bacteria contain an outer membrane that functions as the cell's ini-tial barrier to the environment.
Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
You are doing research on rodent populations in a cornfield at night and are hearing popping noises. Your research assistant is getting scared. Having taken biology, you can explain to your assistant that the popping sound is due to
A. the apical meristem cells in the corn stalks elongating. B. the developing of the kernels of corn on the ears of the corn stalks. C. the expansion of the lateral meristems increasing the girth of the corn stalk. D. the growth of the intercalary meristems inside the corn stalk. E. the development of the tassels on top of the corn stalk.
Refer to Figure 40-5. The molecules required to bind at the sites labeled 1 and 2 for a cross bridge to
form are:a. Ca2+ and myosin. b. ADP and myosin. c. myosin and troponin. d. ATP and Ca2+. e. tropomyosin and O2.