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A population of Anopheles mosquitoes reaches very high densities, and is subjected to aerial spraying by DDT. The following six years, the mosquitoes are not observed at all, but the population was sprayed “just in case”. An outbreak occurs sevem years later,however, and this time, the aerial spraying with DDT is much less effective. Laboratory tests indicate that these mosquitoes are resistant to DDT, avoiding surfaces coated with it. It also seems that they have a reduced growth rate and lower fertility than mosquitoes from previous years. Field ecologists report that virtually every predatory insect has been eliminated from the regions sprayed with DDT.
a. What type of evolutionary event has occurred here? What was the likely mechanism for the change in the mosquito population?b. What recommendations would you make as a mosquito control strategy for the future.
Estimate the major entryway of carbon into the food chain and what is major process that "fixes" carbon into biomass?
Assayed for LDH activity were five uL of a sample that was diluted 6 to 1. The activity in the reaction vessel, which has a volume of 1 mL, is 0.10 U.
How various ATP equivalents are required to synthesize de novo one molecule of IMP, starting from ribose-5-phosphate? Presume that all required precursors in the pathway are present.
q. explain the sequence of steps by which an action potential propagates without loss. illustrate a diagram of an axon
How does the increase in estrogen level correspond to the thickness of uterine lining (endometrium)? Clarify why this makes sense based on the function of estrogen.
What part (or chemical aspect) of the bacteria will be altered when erythromycin is used?
The presence of blood and protein in the urine can indicate the inflammation of the glomerulus. Why would glomerular inflammation result in these substances passing into filtrate and the urine?
Why doesn't flu shots,or any other vaccination, provide protection to a person forever. Why are additional shots needed?
Under which of the following conditions will the lac operon be expressed at the highest level?
Identify the different phases and stages of the mitotic cell cycle.Explain the mitigating factors for transition from one phase and stage to the next phase and stage?
What are the components of a DNA nucleotide? Why was it that knowing the composition of DNA led most scientists to the mistaken belief that DNA could not be the genetic material?
What is the most possible explanation for how these proteins find their way to the mitochondria. What is the good range for a heartbeat stroke work in an anaesthetised sheep? Before and after the venous administration of adrenaline.
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