Agar Cube Lab Report Essay Example

Agar Cube Lab Report Essay Example Agar Cube Lab Report Paper Agar Cube Lab Report Paper Hypothesis: I expect to find that when the surface area o volume of a cell reaches a certain level, diffusion alone wont be able to supply the cell materials needed, and as single-celled organisms take in and release substances by means of diffusion across the cell membrane, this process limits cell size. I predict that as the rate of diffusion will be too slow to deliver materials to the center of the cell in the larger cells, it could result in cell malfunction. Variables: The independent variables are the dimensions of surface area to volume ratio of the agar cube. (1 CM, 1. CM,CM) The dependent variable, the variable am observing/recording, is the time of diffusion (Noah turns the agar cube pink as it disperses into it). The controlled variables will be keeping the concentrations of the Sodium Hydroxide constant, to use agar jelly from the same batch. Also, theres the room temperature which is kept constant and the room pressure. Materials: 250 ml beaker Measuring tape Dull knife Stirring rod Phenolphthalein agar cubes (xx CM, 1. CM,1 CM) Hydrochloric acid (1 m) Paper towel Ruler Procedure: 1- Obtain agar cubes and hydrochloric acid from your lab instructor. Cut the bubs so that one has a length of 1. 00Â ±0. 05 CM, another 1. 50Â ±0. 05 CM, and the 3rd 2. 00Â ±0. 05 CM. 3- Examine the cubes closely and then place them in the ml beaker. As we can see the cube with the largest surface area and volume has the smallest surface area to volume ratio. If the surface area to volume ratio gets too small, then the substances wont be able to enter the cell fast enough to fuel the reactions, because the surface area controls the rate of the exchange of materials while as the volume grows larger it will need more materials to enter and exit, in a more quicker rate, therefore waste products will start to accumulate within the cell as they will be produced faster than they can be excreted. In addition, the cells will not be able to lose heat fast enough and so may overheat. This was concluded from the experiment, where as the Agar cube dimension were larger, the rate of diffusion was much mallet from the Agar cube with the smaller dimension, where the last had a larger V: AS ratio than the larger cube. Errors and Improvements: Error Improvement Parallax error, resulting in a misreading in volume. This is caused by reading the volume readings from an angle, thus to solve this error, readings must be read at the human eye level, where the meniscus being measured at and the eye, are at the same horizontal level for accurate reading intakes. The measuring cylinders that were used for the HCI were not divided by the same rate of division. Use the same type of cylinders for all trials, like a limerick cylinder to measure the amount of aqueous (HCI ) more accurately. The sizes of the cubes were not exact as mentioned ( Ex: 1 CM is not exact ) and as a result the results obtained may not be very accurate. When cutting, a more precise instrument must be used. If no other instrument is found, a more sharper knife can be used accompanied with a more specific ruler. Injury of the surface of the cubes due to hard stirring by the rod. Stir at a slower rate for a longer time than stirring hard for a little time, in addition to that a thinner rod can be used for stirring.

Prioritize

Prioritize Prioritize Prioritize By Maeve Maddox Some speakers hate to hear people use the word prioritize, complaining that â€Å"it’s a made-up word that shouldn’t be used.† Prioritize is a fairly new word, coined in the 1950s, and growing in popularity since the early 1960s. Speakers use it to mean: to give priority to to designate something as worthy of special attention to arrange items to be dealt with in order of importance to establish priorities to establish priorities for a set of tasks Here are some examples of its use online: KMT, CCP agree to prioritize service trade agreement How to Prioritize Your Debts Council Approves Two Projects That Prioritize Pedestrian and Bike Safety Four Must Know To-Do Lists To Prioritize Tasks Strengthening parliaments in nascent democracies: the need to prioritize legislative reforms As late as 1982, twenty years after prioritize entered the language, the OED acknowledged its existence, but included an apologetic note, saying, â€Å"prioritize is a word that at present sits uneasily in the language.† Thirty-two years later, the OED site employs the word prioritizing unapologetically in a discussion of the term â€Å"network neutrality†: This concept [network neutrality] has been the subject of much debate in recent years, reflecting something axiomatic for many Internet users; that all data on the net should be treated equally by Internet service providers, without favouring particular formats, products, or web sites by charging extra fees, prioritizing or blocking data of certain types, and so on. Speakers who still want to hold the line against prioritize could replace it with the phrase â€Å"to set priorities†: KMT, CCP agree to set service trade agreement priorities Council Approves Two Projects that set Priorities for Pedestrian and Bike Safety How to set priorities for your debts People who don’t like prioritize shouldn’t use it, but trying to stop other people from using it is futile. I’ll be happy to recommend a much more worthy target of opprobrium. How about the use of gift as a verb when we already have the perfectly serviceable word give: Lands gifted by donors are the foundation of SSU Preserves programs. The Greeks have gifted the world with many things. Teradata in the fall of 2010 gifted the Walton College of Business with a new Teradata 2650 system.   Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Vocabulary category, check our popular posts, or choose a related post below:Comma After i.e. and e.g.Empathy "With" or Empathy "For"?Empathic or Empathetic?