Lactose

turned off when a small molecule binds to a regulatory protein. On the other hand, an inducible operon is when the transcription is usually off, but can be turned on when a certain molecule binds to a regulatory protein. A good example would be lactose. When lactose is present, then the genes need to be turned on in order to digest…

9.3. Lauryl tryptose broth (MERCK) Tryptose ..................................................................................................................... 20.0 g Lactose.........................................................................................................................5.0 g Dipotassium hydrogen phosphate, K2HPO4 ..............................................................2.75 g Potassium dihydrogen phosphate, KH2PO4..................................................…

has a high possibility for false negatives and results can be inconclusive. We swabbed out bacteria on different mediums such as: vancomycin, EMB-lactose, and PEA. There was no growth on vancomycin and EMB-lactose, which makes them gram-positive results. Gram-positive bacteria can’t grow on those two mediums (Leicht, 2015). The EMB-lactose agar has lactose and sucrose for energy. So the sugars are fermentable substrates, which only allow gram-negative bacteria to grow, not gram-positive…

the bacteria did not ferment lactose. A Gram stain was then performed to confirm that bacteria #12 was indeed gram-negative and also showed that it was rod shaped. Following the provided flowchart, the oxidase test was then performed in order to test for the enzyme cytochrome oxidase; unknown bacteria #12 tested negative. Finally, the bacterium was grown on an EMB plate, which resulted in no color change; this indicated again that the bacteria did not ferment lactose. After these tests were…

does not seem as simple as answering by using yes or no. Is milk bad for dogs? Find the Answer Here Milk, especially cow milk, is something that brings risk for the dog that can cause the upset tummy. It is because the cow milk consists of the lactose. Lactose is very identical with fat and it can lead the dogs experiencing the bloat, discomfort, and also…

negative bacteria, we were able to determine that out of our 8 samples, Proteus vulgaris, Pseudomonas aeruginosa, and Salmonella enteritidis are unable to ferment lactose. Klebsiella pneumonia and Enterobacter aerogenes can ferment lactose to a certain extent where as Citrobacter freundii and Escherichia coli excessively ferment lactose. In our indole test, only Escherichia coli and Proteus vulgaris are able to convert tryptophan to indole. We were able to learn a lot from the TSI agars. The…

was not getting the results that he wanted. He decided to do some research on bodybuilding forums and came up with a diet that was high in protein. He thought since he was not able to drink whey protein shakes like the other athletes because of his lactose intolerance that he would need to consume massive amounts of protein from other sources. Along with his high protein diet, Jeremy was taking a large…

maltose, and 1% lactose solutions turned red-brown as well as had a precipitate form. The honey solution turned brown and also had a precipitate form. The protein solution turned a dark blue colour and the beer solution turned yellow. Table 3: Biuret Test Results Beaker Contents Colour 1% Glucose solution Light clear blue 0.3% Glucose-1-phosphate solution Light clear blue 1% Maltose solution Light clear blue Honey solution Yellow / green 1% Sucrose solution Light clear blue 1% Lactose solution…

Introduction: The purpose of the tests (culture media, motility, enzymes, etc.) we preform on the numerous bacteria in lab is to show any biological or chemical characteristics of the bacteria that may help it survive or adapt in the wild, how it may be useful or hazardous to humans, and use as general knowledge to differentiate bacteria from each other. In the Culture Media test we can use solid and liquid media to grow multiple bacteria in lab. It can help us determine what processes the…

The reason humans are an excellent species is we can control our own destiny. Also, we have advanced sciences and technologies to protect ourselves.We can use and control nature to feed our own. Some scientists think that the evolution of human beings has been stopped. But this is not the truth. The evolution of the human species does not stop. Human is a new species evolved by chimpanzee.Then, a series of unique mutations were carried out from human. Thus, these mutations form the unique…