In the south of France mosquitoes can be a nuisance. As the economy is dependent in part on tourists, this can be problematic. So they spray insecticides to kill the mosquitoes. The heroic mosquitoes had an allele for a gene in their gene pool that resists the insecticide. The two graphs below show the frequency of the resistance allele in two different seasons and two different years. The x-axis is distance from the cost. Note, that spraying stops at about 20 km from the coast. Spraying only happens in the summer? Why might the allele frequency fall so quickly at the coast in the winter?
Select one:
a. Thee allele is advantageous when there is no spraying
b. There is a fitness cost to the allele, so as soon as selection for the allele stops, it's frequency drops.
c. Because there is no gene flow between the fall and summer mosquitoes, the allele will not be passed between them.
d. Genetic drift eliminates many mosquitoes because of spraying, so the allele frequency goes down.

With the description of the different cell walls, membranes, and associated proteins set in the students' minds, you now need to introduce them to the idea that the cell wall can also act as a foundation to build things upon. bacterial appendages require a strong foundation that will offer the support needed to move and function in a dynamic world. for example, flagella are long, whiplike protein structures that are used by many gram-positive and gram-negative bacteria for locomotion. in order to function effectively, a flagellum must be firmly anchored to the cell wall. how will you be able to get across the idea that the peptidoglycan cell wall is strong enough to support such a mechanism? with a protein rod that passes through the cell wall and protein rings used to anchor it in the membranes, these basal bodies are the rudimentary biological motors that use atp power to spin the hook and the flagella attached to it. bacterial flagella have a biological motor that spins within the cell wall and is powered by atp. this allows the flagella to spin in a whiplike motion to propel the bacterium.

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

Suppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer