Using the characteristics that define life, compare and contrast a plant, a bacterium, and a salt crystal. What will be an ideal response?
Cellular in structure: A plant (eukaryote) and a bacterium (prokaryote) are cellular, but a
salt crystal is not.
Grow and develop: A plant grows by increasing the size and number of cells in its
multicellular body; a bacterium grows by increasing in size and then dividing to produce
additional bacteria. Both plants and bacteria develop as they age. A salt crystal can increase
in size only by adding additional crystals and does not “develop” in the biological sense of
the word.
Regulate their metabolic processes: Plants and bacteria can regulate their metabolism; a
salt crystal lacks metabolic processes.
Respond to stimuli: In bacteria (unicellular) the whole organism responds; in plants
(multicellular) various parts can usually respond in different ways. A salt crystal cannot
respond.
Reproduce: Plants and bacteria usually can reproduce both sexually and asexually. A salt
crystal cannot reproduce unless one accepts the breaking apart of a crystal as a type of
reproduction.
Evolve and adapt: Plants and bacteria can do both; salt crystals cannot.
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Severe acute respiratory syndrome (SARS)
A. is classified as an opportunistic infection. B. causes high fever, pneumonia, and respiratory distress. C. began with an initial outbreak in the United States and then spread to Canada and China. D. is caused by the respiratory syncytial virus.
Which of the following statements is true?
a. Enzymes bond to macromolecules during condensation and detach during hydrolysis. b. Enzymes may act on any macromolecule within the same class as its primary reactant. c. Each type of enzyme serves as a catalyst for only one specific macromolecule. d. Enzymes only act during dehydration synthesis, never during hydrolysis.
Mitochondrial genomics is primarily used to do which of the following?
a. generate new hybrid strains b. improve disease resistance c. increase crop yield d. trace genealogy
In the above diagram, the _____ is/are labeled with the letter "E"
a. esophagus b. larynx c. trachea d. epiglottis e. bronchi