Describe how mutations can lead to whole populations of bacteria becoming resistant to certain antibiotics
What will be an ideal response?
Within a population of bacteria, there will be some genetic variability. Some individuals will have random mutations that provide them with a selective advantage in certain environmental conditions, such as in the presence of antibiotics. In the presence of this antibiotic, those individuals that are better equipped to survive will thrive and multiply, giving rise to a larger contingent of resistant bacteria each succeeding generation.
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Which of the following would not be a "control" in an experimental procedure?
A. a normal group B. an experimental group C. a known standard of comparison D. a placebo group E. a "zero-value" group
If an atom has the atomic number 4 and the atomic mass 9.012 it will have ________ electrons in the first energy level.
A. 1 B. 2 C. 3 D. 4
Cnidaria and flatworms exchange gases and remove wastes by way of their
A. open circulatory systems. B. moist skin surfaces. C. closed circulatory systems. D. respiratory and excretory systems. E. gastrovascular cavities.
If a coleus plant becomes tall and spindly, what can you do to encourage it to develop lateral branches, so that it becomes bushier?
What will be an ideal response?