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1. Surface tension is a force that holds the surface of a fluid together. It results from the cohesiveness of the liquid molecules. Explain what makes water molecules cohesive.
2. What characteristic(s) does a substance need to possess in order to be hydrophilic?
3. Explain why a column of water moved up the inside of the glass capillary tube in this exercise.
4. Explain why water behaved differently in the plastic capillary tube compared to the glass tube.
5.
a. Hand draw a line graph (no computer graphics!!) of the class average data that was collected in section III.B of today's lab. The x-axis should be the number of drops of detergent and the y-axis should be the distance between the top of the water in the test tube and the top of the water in the capillary tube. Your graph must be neatly drawn and your data points clearly marked with an appropriate symbol (a large dot, square, triangle, etc.). Use a straightedge to connect the data points together. Clearly label the axes of your graph and give the graph an appropriate title. Attach it to this sheet when turning in your assignment.
b. Explain why the detergent had the effect it did on the height of the water column.
Hypothesis: since the normal substrate for the enzymes is lactose, adding lactose along with ONPG will reduce the rate of yellow color formation.
List in chronological order five major discoveries or developments in molecular biology and bioinformatics since the early 1950's, which you consider responsible for the current state of these fields. Provide a brief explanation for each of your c..
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A brass vat is 20 m long and room temperature 20 degree Celsius. How much longer is it when it contains boiling water at 1 atm pressure?
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List the parts of an ATP molecule and draw them properly connected. (Describe how the parts are connected in your own words.)
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While the standard view of the Krebs cycle is two carbon entering (acetyl CoA) and two carbons leaving (carbon dioxide) each round, other substrates enter and leave at different points as well. What are the connecting pathways for each of the Kre..
A method for separating polypeptides makes use of their differentail solubilities. The solubility of huge polypeptides in water depends upon the relative polarity of their R groups.
The Obama administration plans to unveil a new AIDS strategy Tuesday, aimed at reducing new infections and increasing the number of HIV-positive people getting care.
Consider an enzyme that is subject to allosteric regulation. If acompetitive inhibitor (not an allosteric inhibitor) is added to a solution containing such anenzyme, the ratio of enzyme molecules in the active form to those in the inactive forminc..
Which part of a plant absorbs most of the water and minerals taken up from the soil?
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