1- Why does a banana peel turn from green black when placed at room temperature? 2- what happen to banana and the apple when put them in paperbag in fridge and why that change happed?
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- -THAWING- please answer as soon as possible thank you and kindly please make it possible for 3-4 sentences? What is the effect of subsequent thawing and freezing to the texture of ice cream?Please answer fast What is this organism? And what other test could be done to confirm it's identification? 1. Gram stain - positive cocci, chains Hemolysis- gamma BE - positive NaCl - positive Catalase - weakly positive 2. Gram positive cocci, chains NaCl - negative BE - negative Hippurate - positive Hemoylsis - beta Catalase - negativeBased on this video: https://youtu.be/3PYdMaClUmw Observation Interpretation Test Tube 1 H2O2 + 1 piece uncooked potato + 1 mL H2O Test Tube 2 H2O2 + 1 piece cooked potato + 1 mL H2O Test Tube 3 H2O2 + 1 piece uncooked potato (cut into small pieces) + 1 mL H2O Test Tube 4 H2O2 + 1 piece uncooked potato + 1 mL vinegar
- Please help me answer correctly the table this is my assignment in biochem lab Procedure: 1. Prepare 5 test tubes. Place 1 ml of 1% starch and add 10 drops of saliva to each tube. Mix thoroughly. 2. Place the first tube in ice water, the 2nd tube leave at room temperature, the 3rd tube in 40°C , the 4th tube at 60°Cwater bath and the 5th tube boil for 2 minutes.. 3. Leave the 4 tubes in their respective temperatures for 30 minutes. The 4th tube allows to stand for 30 minutes after heating for 2 minutes. 4. Test the contents of each tube with iodine and benedict’s tests.Why are products mixed with phenols and surfactants preferred when cleaning surfaces? Question 14 options: More cost effective These remove visible residue Better for skin allergies Saves time/more effective with one step cleaning and disinfectantsEnzyme Potato Experiment Observation Interpretation Test Tube 1 H2O2 + 1 piece uncooked potato + 1 mL H2O Test Tube 2 H2O2 + 1 piece cooked potato + 1 mL H2O Test Tube 3 H2O2 + 1 piece uncooked potato (cut into small pieces) + 1 mL H2O Test Tube 4 H2O2 + 1 piece uncooked potato + 1 mL vinegar
- Answer TRUE OR FALSE only. 1. All types or kinds of media powder has a standard ratio of 23:1000. Meaning that 1000 ml of water is needed to dissolve 23 grams of powder medium. 2. Simple stains use one dye and cannot differentiate various types of bacteria while differential stains use several dyes in order to differentiate between different kinds of bacteria. 3. A certain student prepared his fixed sample for examination by pouring Nigrosin which is an acidic stain. He then observed that under the microscope the background was stained but the bacterial cells were untouched. This student therefore adapted the acid-fast staining procedure. 4. In doing serial dilutions, the original sample must be shaken at least 25 times to obtain a uniform distribution of organisms. 5. Label all reagents with its name, concentration and date of its preparation except for water.1. If you expose E.coli to UV light at 30 seconds, 1 minute, 3 minutes and 5 minutes, what are your expected results? 2. If you expose. B. cereus to UV light at 30 seconds, 1 minute, 3 minutes and 5 minutes, what are your expected results? 3. If you do not remove the cover of the plate before exposure to UV light at 5 minutes for E.coli and B. cereus, what are your expected results? Help with 1,2 & 3 pleasehave a progressive su week. 1. Why are basic stains the most commonly used stains in microbiology? 2. What does the term "aseptic" mean? 3. Why are differential stains used more often than simple stains? 4. What are the three parts of a stain? 5. Why is it critical to allow cells to air dry before heat fixation? 6. Give an example of a basic stain and an acidic stain. 7. Give an example of a differential stain. 8. What is a medium? 9. What is the definition of a bacterial colony? 10. Why do we want to get an isolated bacterial colony from a mixed culture? Next lab: A continuation of staining techniques. to a
- Please answer questions 1 and 2 directly. 1. Discuss what is isoelectric precipitation/point? 2. Differentiate whey from casein (refer from the posted picture)Fit to 3. A group of students wants to study the effects of temperature on bacterial growth. To get bacteria, they leave petri dishes of nutrient agar open on a shelf. They then put the dishes in different places: an incubator (37 degrees C) a lab room (21 degrees C), a refrigerator (10 degrees C) and a freezer (0 degrees C). Bacterial growth is measured by estimating the percentage of each dish covered by the bacteria at the end of a three day growth period. a) What is the independent variable? b) What is the dependent variable? c) List two (or more) ways to improve this experimental design.Will UPVOTE Answer the following: 1. What is the effect of boiling in the test tube with starch solution and saliva? 2. What is anaerobic oxidation? In your observation, which is the Hydrogen acceptor in the experiment, methylene blue or milk? 3. If the sample turned to blue or black upon the addition of I2 solution, is the honey genuine or not? Explain your answer 4. What changes do you think take place as the color changes upon the addition of phenol, pyrogallol or catechol and guac solution to the potato extract? 5. Differentiate an enzyme activator from an indicator