Rudolf Virchow is given credit for proposing which of the following theories?
A) abiogenesis
B) biogenesis
C) germ theory of disease
D) spontaneous generation
B) biogenesis
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The amount of energy necessary for an
electron to jump to its next level
a. varies depending on the atom. b. is exactly equal to what it needs. c. is always in excess of the needed amount. d. is exactly twice the energy emitted when the electron loses energy. e. is less than the energy emitted when the electron loses energy.
Absorbance at Various pH Levels
Time (sec) pH 4 pH 5 pH 6 pH 7 pH 8 pH 9 20 0.003 0.025 0.055 0.146 0.005 0.004 40 0.009 0.109 0.152 0.300 0.015 0.008 60 0.012 0.195 0.255 0.432 0.038 0.010 80 0.020 0.215 0.341 0.552 0.065 0.012 100 0.023 0.333 0.413 0.659 0.081 0.013 120 0.025 0.360 0.478 0.755 0.090 0.013 The accompanying table represents the results of an experiment where the effects of pH buffers on an enzyme found in saliva (amylase) were studied. A spectrophotometer set at 500nm was used to measure absorbance at the various pH levels every 20 sec for 2 min. The higher absorbance values would indicate greater enzyme activity. All experiments were conducted at the same temperature. Which statement correctly identifies the result that the optimum pH for amylase function is 7? A) The pH with the lowest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. B) The pH with the highest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. C) At pH 9, the enzyme is denatured and will lose its function, but not its structure. D) At pH 4, the structure of the enzyme will be altered, and the enzyme would not be able to catalyze the reaction.
Is there an "optimum" beak size for finches?
a) No, beak size in finches appears to be dependent on the amount of rainfall. b) Yes, sexual selection always selects for the largest beak size. c) Yes, larger beaks are always better for finches. d) Yes, smaller beaks are always better for finches. e) No, beak size stays the same, regardless of environmental factors.
The classifications gram-positive and gram-negative are based on ________ of the bacterial cell wall
Fill in the blank(s) with correct word