Cell Transport Essay Example

Cell Transport Essay Example Cell Transport Paper Cell Transport Paper Exercise 1: Cell Transport Mechanisms and Permeability: Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 09/20/11 page 1 Experiment Results Predict Question: Predict Question 1: The molecular weight of urea is 60. 07. Do you think urea will diffuse through the 20 MWCO membrane? Your answer : c. No, not at all. Predict Question 2: Recall that glucose is a monosaccharide, albumin is a protein with 607 amino acids, and the average molecular weight of a single amino acid is 135 g/mole. Which of the following will be able to diffuse through the 200 MWCO membrane? Your answer : a. neither glucose nor albumin Stop Think Questions: The reason sodium chloride didnt diffuse left to right is that You correctly answered: c. the membrane pore size was too small. Glucose is a six-carbon sugar. Albumin is a protein with 607 amino acids. The average molecular weight of a single amino acid is 135 g/mole. There is no reason to run these solutes at the 20 MWCO because You correctly answered: d. lucose and albumin are both too large to pass. The rate of diffusion for urea You correctly answered: b. is slower than that for sodium because urea is a larger molecule. Experiment Data: Solute Na+ ClUrea Na+ ClNa+ ClNa+ ClUrea Glucose Albumin MWCO 20 20 50 50 100 100 200 200 Solute Concentration 9. 00 9. 00 9. 00 18. 00 9. 00 9. 00 9. 00 9. 00 Average Diffusion Rate 0. 0000 0. 0000 0. 0150 0. 0300 0. 0150 0. 0094 0. 0040 0. 0000 09/20/11 page 2 Post-lab Quiz Results You scored 50% by an swering 2 out of 4 questions correctly. 1. The effect of increasing the concentration of sodium chloride from 9 mM to 18 mM in the left beaker was to Your answer: c. no change to the rate of diffusion. Correct answer: b. increase the rate of diffusion. 2. Describe the difference between the rate of diffusion seen for sodium and urea. Your answer: b. Urea diffused faster because it is smaller than sodium. Correct answer: c. Urea diffused more slowly because it is larger than sodium. 3. Which of the following solutes did not pass through any of the membranes? You correctly answered: b. lbumin 4. When diffusion stops, we say the solution has reached You correctly answered: a. equilibrium. 09/20/11 page 3 Review Sheet Results 1. Describe two variables that affect the rate of diffusion. Your answer: The size of the molecule, and the charge of the molecule 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? Your answer: Because Ureas molecular wei ght is 60. 07, 20 MWCO will only allow a molecular weight of up to 20 pass through. 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? Your answer: My prediction that neither glucose nor albumin would pass through the 200 MWCO membrane was wrong, true albumin did not pass through but gucose did because it is a smaller molecule. 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. Your answer: Sodium, Chloride, Urea, Glucose, Albumin 09/20/11 page 4

Rising Action in Literature Keeps Readers Engaged

Rising Action in Literature Keeps Readers Engaged Have you ever kept reading well into the night because you just couldnt put a book down? The rising action of a plot refers to the events that provoke conflict, build tension, and generate interest. It adds that edge-of-your-seat element that motivates you to keep reading until you reach the story climax. Rising Action in Action You can find rising action in many stories, from a complex novel to a simple childrens book. For example, the rising action in The Three Little Pigs takes place as the pigs set out and begin to make their own decisions. You can surmise that two of the pigs are asking for trouble when they choose flimsy materials to build their houses. Little suspicions such as these (along with the wolf lurking in the background)  build suspense: with each page, readers come to understand that these characters are headed for disaster. Things get more and more exciting and tense each time the wolf blows down a house. The action builds to the ultimate showdown between pig  and wolf. In literature, the rising action encompasses the decisions, background circumstances, and character flaws that lead a story from the opening exposition through the drama and run-up to the climax. The primary conflict  can be an external one, such as a clash between two men trying to exert their dominance at work, or it can be internal, as in the case of a college student who realizes she wants to leave school but cringes at the thought of telling her parents. Rising Action in Black and White As you read a novel, pay attention to clues that predict trouble down the road. It could be anything from  the appearance of  a character who  seems shady and untrustworthy, to the description of a clear morning marred by one dark cloud on the horizon.  You can practice identifying rising action by considering how the tension builds in the following tales: Little Red Riding HoodWhat is the first sign of trouble? Were you a bit unnerved when you learned that this innocent child would walk through the dangerous forest alone?Snow WhiteIn the original version, this story contains the ultimate evil character: the wicked stepmother. Her presence signals trouble to come. And that magic mirror adds another layer of intrigue to the story.CinderellaCinderella also  finds herself tormented by an evil stepmother. Her first meeting  with the prince foreshadows the complications to come, while the clock ticking closer to midnight on the night of the ball creates real tension.Hansel and GretelWhats with all the evil stepmothers? And who doesnt suspect that a confectionery cottage is too good to be true? It can be easy to see the suspense building in the short stories from childhood. But if you consider how subtle clues informed and cautioned you, you can find the same types of signs in more sophisticated books. Think about the suspenseful moments that build in each story to get a better sense of the development of rising action in the novels you read.