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 variation, designed to accompany introductory point biology classes, is helping scholars learn how to shape hypotheses and follow the clinical procedure. Questions within the guide advertise severe pondering and support scholars make actual observations, set up and interpret their info, 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 resources for Biology in the Laboratory: (3rd edition)

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11. 5 ␮l of red-dye solution onto a piece of Parafilm or wax paper. After dispensing the dye, pick up the drop with the same pipette and transfer it to another location on the Parafilm. PART 2 The Graduated Cylinder For measuring larger amounts of fluid, graduated cylinders are used. Two types are in common use: glass cylinders and cylinders made from organic polymers such as polycarbonates. Water adheres more strongly to glass than to polymers, and thus the water at the top of a column will “climb” the sides of a glass cylinder to form a bowl-like meniscus.

It is just like a tiny ruler! Figure 1D-1 Ocular micrometer and stage micrometer. 4 5 (a) the ocular micrometer (b) the stage micrometer You can calibrate an ocular micrometer as follows. Using your scanning objective (4ϫ), look through the ocular containing the micrometer and focus on the stage micrometer. Now move your objective to low power (10ϫ) and refocus on the micrometer using the fine adjustment knob. The two scales should appear to be superimposed on one another. Move the stage micrometer to match up its left end with the left end of the ocular micrometer Observations and Measurements: The Microscope Figure 1D-2 Ocular and stage micrometers are aligned for calibration.

Take care not to trap bubbles under or around the specimen. Do not press down on the coverslip. If there is too much water, draw off the excess by touching the corner of a paper towel to the edge of the coverslip. 3. Examine your wet mount under low power and then under high power. Remember, care must be taken to avoid touching the coverslip with the objective lens. Not only will it move your specimen, it might break the coverslip or scratch the objective lens. Observations and Measurements: The Microscope 1-9 Figure 1C-1 Technique for preparing a wet-mount slide.

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