A large number of copies of any DNA segment can be obtained by:
a. introducing foreign DNA into a microorganism so that it can be replicated.
b. stimulating increased transcription of the appropriate sequence of mRNA.
c. stimulating increased translation of the appropriate DNA molecule.
d. inducing the production of DNA from proteins.
e. stimulating reverse transcription of tRNA
A
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In some rocky intertidal habitats, the barnacle Chthamalus can survive across the same depths as can the barnacle Balanus
However, where the two occur together, Chthamalus adults are found only in the more stressful upper portions of the habitat where they are more prone to desiccation. This is an example of: A. the mutualistic form of symbiosis. B. intraspecific competition reducing the size of Chthamalus' fundamental niche to a smaller realized niche. C. mutualism reducing the size of Balanus' realized niche to a smaller fundamental niche. D. competitive exclusion reducing the size of Chthamalus' fundamental niche to a smaller realized niche. E. competitive exclusion expanding the size of Balanus' realized niche to a larger fundamental niche.
Which of the following is(are) true about
predator-prey coevolution? a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. All of the above are true. e. None of the above are true
In the food chain below, what does the blue jay represent? crabgrass—cricket—garden spider—blue jay—red-tailed hawk
A. herbivore B. primary producer C. primary carnivore D. secondary carnivore E. detritivore Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about trophic levels? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When a reaction is at equilibrium, _____.
A) reactants no longer convert to products B) there are equal concentrations of reactants and products C) the temperature must be absolute zero D) there is no net change in the concentration of reactants and products