To determine the specific growth rate of a bacterial population, it is essential to know
A) cell concentrations at varied time points.
B) total number of cells in the population at varied time points.
C) cell concentrations at varied time points or the generation time.
D) turbidity measurements and the total number of cells in the population at varied time points.
Answer: A
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How did Thomas Malthus's ideas, about human population, affect Darwin's ideas on natural selection?
A. Darwin decided that if human population increased with each successive generation, all animals and plants must reproduce using the same principles. B. Darwin abandoned his idea of natural selection because Malthus' work proved that populations would continually double in number with each generation. C. Thomas Malthus believed that human populations declined when temperature drops, therefore Darwin concluded that all plant species will not reproduce in cold temperatures. D. Mallthus believed that only a fraction of any population will survive and reproduce, Darwin contradicted Malthus's theories and said that all species will continue to survive and reproduce indefinitely. E. Malthus theorized that only a fraction of any human population will survive and reproduce. Darwin's observations during his voyage on the Beagle, supported Malthus' theory.
Which etiologic agent is associated with an infection resulting in a copious frothy fishy-smelling vaginal discharge?
A. Neisseria gonorrhoeae B. Gardnerella vaginalis C. Chlamydia trachomatis D. Treponema pallidum
Matching. Choose the most appropriate letter for
each. 1. ___ p + q 2. ___ species 3. ___ directional selection 4. ___ gene pool 5. ___ balanced polymorphism 6. ___ p2 7. ___ 2pq 8. ___ genetic equilibrium 9. ___ q2 A. a reference point that implies stability of gene frequencies through generations B. encompasses all of those actually or potentially interbreeding populations that are reproductively isolated from other such groups C. the genes of an entire population D. the frequency of homozygous dominants in a population E. the frequencies of dominant and recessive alleles in a population F. the frequency of heterozygotes in a population G. the frequency of homozygous recessives in a population H. HbA and HbS in regions where malaria is found I. pesticide-resistant pests
Which one of the following steps of the scientific method should come only after a hypothesis has been formed?
A. question formulation B. resource exploration C. experimentation D. observation