Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to the development of
A. detection methods for protons.
B. alpha particle emitters.
C. gold as an element.
D. the modern model for atomic structure.
E. the concept that atoms have a homogenous distribution of protons throughout the atom.
D. the modern model for atomic structure.
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Which of the following bacteria benefits humans?
A) Enteritis Salmonella B) Lactobacillus C) Streptococcus Pyogenes D) Salmonella Typhi
Scientists believe that macromolecules could have been formed before there were living cells by
a. chemical processes removing water from components. b. oxidation of compounds containing phosphate. c. lightning discharge catalyzing addition of water to molecules. d. enzyme-mediated condensation reactions. e. acidic hydrolysis of compounds in the Earth's oceans.
Each species occupies a certain __________characterized by physical and chemical features and by
the array of other species living in it. Fill in the blank(s) with the appropriate word(s).
Which of the following bacterial genera is useful for sewage treatment?
A) Burkholderia B) Thiobacillus C) Neisseria D) Zoogloea E) Nitrosomonas