Biology in the Laboratory: (3rd edition) by Doris R.; Helms, Carl W.; Kosinski, Robert J.; Cummings,

By Doris R.; Helms, Carl W.; Kosinski, Robert J.; Cummings, John R. Helms

Biology within the Laboratory, 3rd version, designed to accompany introductory point biology classes, is helping scholars learn how to shape hypotheses and practice the clinical approach. Questions within the handbook advertise serious considering and support scholars make actual observations, manage and interpret their information, and achieve sound conclusions. Custom PublishingCreate a personalised model of this article or mix 'n match it with comparable titles with W.H. Freeman customized Publishing!

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Extra info for Biology in the Laboratory: (3rd edition)

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View the cylinder and estimate volume: (a) from a standing position ________ , (b) at eye level ________ , and (c) from below ________ (see Figure 2C-6). a. How do volumes estimated from these various positions compare? ________________________________ ________________________________________________________________________________________________ Observations and Measurements: Measuring Techniques Figure 2C-6 Reading the volume in a graduated cylinder. 2-9 50 40 meniscus (a) 30 (b) 20 10 (c) 3.

______________________________________________________________________________ You will need to recalibrate the ocular micrometer for each objective. c. 10ϫ objective: 1 division on the ocular micrometer ϭ ________ mm ϭ ________ ␮m d. 43ϫ objective: 1 division on the ocular micrometer ϭ ________ mm ϭ ________ ␮m It is now possible to measure the size of a specimen by viewing it through an ocular containing an ocular micrometer that has been calibrated. 5. Remove the stage micrometer. Using low power, locate a filament of Nostoc and bring it into clear focus.

10. Research technicians in in biotechnology laboratories need to measure microvolumes accurately and repeatedly. To do this, digital micropipettes are used (Figure 2C-5). These pipettes usually have a continuous range of 1 ␮l to 100 ␮l, and even fractional volumes can be selected. A digital display allows you to set the pipette to a desired amount by turning the handle of the digital micropipette. A plastic tip (which can be sterilized if needed) is used to hold the liquid and the tip can be ejected easily.

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