Students in dr. branch's physics class were calculating the average time required for one complete period of a pendulum bob. they set up five pendulums and timed the swing for each one twenty-five times. then they calculated the average period time.
one set of data varied significantly from the other sets. what could be one source of unavoidable error that influenced the data?

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.

What is the similarities and differences between bacteria and eukaryote?

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs