Biological Investigations: Form, Function, Diversity and by Warren D Dolphin

By Warren D Dolphin

This lab guide is for a one or two-semester majors point basic biology lab and will be used with any majors-level common biology textbook. The labs are investigative and ask scholars to take advantage of extra serious considering and hands-on studying. the writer emphasizes investigative, quantitative, and comparative methods to learning the existence sciences.

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Extra info for Biological Investigations: Form, Function, Diversity and Process

Sample text

Divide the weight of water in the beaker by the density of water to calculate the volume of water in the beaker. How much water, in milliliters, is in your beaker? Simple Statistics Calculate the experimental error as a percentage (called percentage error) using the following equation: % error = = actual – theoretical value value × 100 theoretical value actual volume of H 2 0 − 40 × 100 40 % error = ________________ In recording the results of the above calculation, you undoubtedly had to make a decision about the number of significant figures to write down.

Observe a trapped Paramecium with high power, looking for one of the two water expulsion vesicles. Are the water-expulsion vacuoles temporary or permanent? Do the anterior and posterior vesicle contract at the same time? At the same rate? The normal rates of pulsation vary somewhat with culture conditions. You may expect a rate of six to ten pulsations per minute in the culture fluid. Draw a Paramecium below and record your observations as notes. 3. C A U T I O N Sodium azide is a deadly poison that blocks cellular respiration by binding to the cytochromes.

Measure the distance each gas traveled in the tube. C A U T I O N The HCl is a concentrated acid and can harm you and your clothes. The NH4OH is very irritating to the eyes and nose. For these reasons, your instructor may choose to do this part of the exercise as a demonstration. 36 Determining How Materials Enter Cells 4-6 Dolphin: Biological Investigations: Form, Function, Diversity & Process, 6/e 4. Determining How Materials Enter Cells Text Record the results of your experiment below. What is the ratio of these distances?

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