g The ultimate significance of the fact that artificial selection often leads to change in the tested population is that it a. shows that most animal species have a long way to go in reaching their full evolutionary potential. b. demonstrates that genetic differences are often responsible for phenotypic differences among the members of a population. c. demonstrates that the environment has relatively little effect on the development of most behavioral attributes. d. shows that populations often possess the potential for evolutionary change in the present, and so they could have been evolving in the past.

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Four types of motile cells in human body?

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.