In plants, primary growth occurs at a growing center called a(n)
A. cork cambium.
B. apical meristem.
C. vascular cambium.
D. lateral meristem.
Answer: B
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In a population of Mendel's garden peas, the frequency of green flowered plants (genotype aa) is 49%. The population is in Hardy-Weinberg equilibrium. What are the frequencies of the AA and Aa genotypes?
A. 49% AA, 2% Aa B. 9% AA, 42% Aa C. 42% AA, 9% Aa D. 33% AA, 18% Aa E. Can't determine from this information.
You expose a tube of bacteria to ultraviolet radiation to induce mutations. You then spread the bacteria on a plate containing media with all known required nutrients and wait until separate colonies form. Finally, you use replicate plating to transfer a print of this plate to an additional sterile plate containing minimal media plus a known required nutrient for the bacteria. Based on this protocol, colonies growing on the plate with minimal media would include what type of cells?
A. only wild-type bacteria B. only mutant bacteria C. mutants that only require the supplied nutrient D. Both wild-type and all mutants E. wild-type bacteria and the mutants that only require the supplied nutrient 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 growth media? How does it relate to the question? · What other information is related to the question? Which information is most useful? 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?
The enzyme nitrogenase is most directly involved in the process called
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
Which of the following is the most likely explanation for the loss of mitochondria in Excavates?
a. their flagella b. their aquatic habitat c. their similarity to bacteria d. their parasitic lifestyle