Which types of genetic recombination occur in bacteria?
A) Transformation
B) Conjugation
C) Transduction
D) Transformation and transduction
E) Transformation, conjugation and transduction
D) Transformation and transduction
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At a minimum, primary producers require water, carbon dioxide, and light. These are things that are readily available in most ecosystems. However, we do not observe the same rates of net primary productivity in every region of the globe
Which of the following statements best reflects one reason why rates of productivity are not the same everywhere? A. Rates of net primary productivity are actually the same everywhere; scientists just need to calculate the rates relative to plant biomass in a given ecosystem. B. Although water is limited in certain ecosystems, nutrients that are scarce actually limit net primary productivity because they are necessary for growth. C. Although water is limited in certain ecosystems, irrigation would solve the problem and equalize rates of net primary productivity in every ecosystem. D. Rates of net primary productivity are actually limited by the amount of solar radiation. If net primary productivity were calculated as a yearly average, then this would show that ecosystems have the same rate of productivity.
The male part of a flower is the
a. carpel. b. stamen. c. petal. d. sepal. e. receptacle
The benefits of aerobic exercise include all of the following EXCEPT an ____
a. increased number of mitochondria b. increased blood supply c. increased supply of myoglobin d. increased number of fibers in a motor unit e. increased activity of lipoprotein lipase
A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following procedures would best test the researcher's hypothesis?
A. Design a method to isolate the bacteria from the insect, then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media. B. Determine which insecticide kills the insect without harming the bacterial host, then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects. C. Extract the DNA from the bacteria and from the insect, then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organisms. D. Determine which antibiotic kills the bacteria without harming the host, then administer this antibiotic to the insect and compare its growth with and without the vitamin.