17. the eyepiece of a compound light
microscope has a magnification of 10x and the low-power objective and high-power objective lenses have magnifications of 10x and 30%, respectively. if the diameter of the
low-power field measures 1500 micrometers, the diameter of the high-power field will
measure either 4500 micrometers or 500 micrometers.
select the correct diameter. support your
answer.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.