Read e-book online Biology in the Laboratory: (3rd edition) PDF

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

ISBN-10: 0716731460

ISBN-13: 9780716731467

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

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Your null hypothesis? Was your prediction correct? What do you conclude about the effects of varied environmental conditions on cyclosis? 8. If pond water, algal, or protozoan cultures are available, make wet mounts of these by placing one drop of culture medium on a clean slide and applying a coverslip. Some of the unicellular organisms you will see are protozoans, which may move very rapidly across the microscope’s field. It may be necessary to slow these organisms by adding a drop of methyl cellulose (Protoslo) to the culture drop (mix with a toothpick).

02 ϫ 1016 Hϩ ions. 34 ϫ 1025), you will discover that only 2 ϫ 10Ϫ9 or 2 ten-millionths of a percent of all water molecules present in 1 l of water are ionized. That is a very small amount! pH and Buffers 3-3 Since for pure water, [Hϩ] ϭ 1 ϫ 10Ϫ7 M and [OHϪ] ϭ 1 ϫ 10Ϫ7 M, then pH ϭ 7 and pOH ϭ 7, so pH ϩ pOH ϭ 14. It is important to realize that in any solution, as is the case for pure water, the product of [Hϩ] and [OHϪ] is constant. For pure water, the molar amounts of Hϩ and OHϪ are equal. If an ionic or polar substance is dissolved in water, it may change the relative amounts of Hϩ and OHϪ but the product of the two concentrations is always 1 ϫ 10Ϫ14 because water is a source of Hϩ and OHϪ ions and the ion product (which reflects the tendency of water to ionize) remains constant.

4. On the drawings below, label each type of pipette and indicate how you would measure out the amount of liquid specified for each type of pipette. 2 ml : 0 1 2 3 4 5 6 7 8 9 10 10 ml : 10 ml in 1/10 TD 2-16 Laboratory 2 5. Draw a representation of the graduations you expect to see on pipettes labeled as follows (todeliver scales): 5 ml in 1/10 1/10 ml in 1/100 6. When pipetting acids or other harmful materials, should you pipette by mouth? ________ If not, how should you pipette such materials?

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

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