Widmanstätten patterns are found in ____________ meteorites
Fill in the blank(s) with correct word
iron
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The nasal hairs, convoluted passages, and mucous lining of the nasal turbinates:
a. nonspecifically protect the respiratory tract from infection. b. promote colonization of normal bacterial flora. c. can aid adherence by potentially harmful bacteria. d. reduce colonization of normal bacterial flora.
Consider the evolution of metabolic pathways. We believe that these pathways evolved from the
a. precursor to the end product, as enzymes became more efficient over time. b. precursor to the end product, as cells simplified the biochemistry of the external environment. c. end product to the precursor, as cells gradually evolved according to a predetermined plan. d. end product to the precursor, as intermediates in the pathway were depleted in the environment. e. end product to the precursor, as photosynthesis began to supply the energy to power the changes at each stage.
A bacterium that uses the oxidation of inorganic compounds to provide energy for manufacturing
nutritious organic compounds is a: a. photoautotroph. b. parasite. c. saprotroph. d. chemoautotroph. e. pathogen.
Which of the following statements concerning the heart is false?
a. It is an organ. b. It contains endothelium. c. It contains nerves. d. It is an organ system. e. It contains smooth muscle.