The lambda immunity region includes
a. the repressor gene cI.
b. the positive regulator gene cIII.
c. the positive regulator gene cII.
d. the antiterminator gene N.
e. All of the above.
Ans: a
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Some species of orchids attract pollinating Hymenoptera (bees and wasps) with flowers that closely mimic the appearance of a female insect. As the male attempts to mate with the flower, he becomes loaded with pollen, helping the plant to reproduce. If one of these orchid plants acquired a loss-of-function mutation in a CYCLOIDEA-like gene, what do you predict might happen?
A. The mutation would quickly spread through the population. B. The mutant plants would have fewer available resources to devote to nectar production. C. The mutant plants would attract larger numbers of pollinating male insects. D. The mutation would fail to spread in the population. Clarify Question What is the key concept addressed by the question? What type of thinking is required? What do you already know about insects as pollinators? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Vascular plant bodies typically consist of a(n) ____ shoot system and a ____ root system
a. photosynthetic; photosynthetic b. nonphotosynthetic; photosynthetic c. photosynthetic; nonphotosynthetic d. nonphotosynthetic; nonphotosynthetic e. autotrophic; heterotrophic
Osmotic concentration in the loop of Henle increases as NaCl as water moves out.
a. true b. false
The number of trophic levels an ecosystem can support is driven by (select all that apply)
A- The amount of energy available (primary productivity) B-The speed of nutrient cycling (decomposition) C- The population size of top predators in the ecosystem D-The efficiency of energy transfer across trophic levels E- The composition of the plant community