Explain how the overuse of antibiotics could lead to the evolution of drug resistant strains of bacteria.
What will be an ideal response?
Just as any population of organisms includes variants with unusual traits, drug resistance occurs naturally in certain bacteria in a population. When a person takes an antibiotic, the antibiotic kills the susceptible organisms, while the resistant strains continue to live and multiply, with less competition from susceptible strains. When antibiotics are used, there is selective pressure for resistance.
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In a chemical reaction, the standard free energy change (?G°') is calculated to be -3.67 cal/mol. What can be said of the chemical reaction?
A) The reaction is at equilibrium under standard conditions. B) The reaction is spontaneous under standard conditions. C) The reaction is not spontaneous under standard conditions. D) Reactants predominate over products at equilibrium under standard conditions. E) There can be no reaction.
Cystic fibrosis is a recessive disorder. If a
couple, each of whom is heterozygous, have children, what is the probability that they will have a child with cystic fibrosis?
a. 0% b. 25% c. 50% d. 75% e. 100%
Which of the following examples demonstrates a mutualistic relationship?
a. mycorrhizae b. rhizobia and root nodules c. soil fungus and soil bacteria d. mistletoe and its host e. Both mycorrhizae and rhizobial/root nodules
When mitosis occurs without cytokinesis, which of the following is produced?
A) merozoites B) chromatids C) cysts D) macronuclei E) coenocytes