Which compound should be used to extract lipids from cells? 1. Water 2. A buffer with high concentration of salt 3. A low pH buffer 4. Chloroform O 4
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- You conduct Lugol's iodine test to determine if starch is present in a solution. The solution exhibits a blue-black colour. What does this result mean? Question options: Starch is not present in the solution. The solution has not yet been heated, which is required before determining the result. The solution is contaminated. Starch is present in the solution.What are the 2 ways of production that will allow a product to be classified as an essential oil?: (Select all that apply) Choose at least one answer. a. hot pressed b. vacuum distilled c. steam distilled d. cold pressedYou conduct Lugol's iodine test to determine if starch is present in a solution. The solution exhibits a pale-yellow colour. What does this result mean? Question options: Starch is present in the solution. The solution has not yet been heated, which is required before determining the result. The solution is contaminated. Starch is not present in the solution.
- A biochemist has 100 mL of a 0.10 M solution of a weak acid with a pKa of 6.3. She adds 6.0 mL of 1.0 M HCl, which changes the pH to 5.7. What was the pH of the original solution?Would the biuret reagent change color if there was only one amino acid in the solution? Motivate your answerWhat is the Carbon content of Cast Irons? Group of answer choices a) Less than 2% b) More than 2% c) Less than 14% d) More than 14%
- Robert Tisserand states that if essential oils are properly diluted, they should be safe to use: Choose one answer. a. once/month b. once/week c. twice/week d. every dayWrite a research abstract about this title: "As a solvent for cleaning laboratory glassware, grapefruit extract is used" Note: 5-10 sentences are enough.Fill in the blank: _______________________ combines with water to form carbonic acid.
- Some foods contain starch.Which chemical is used to test for starch?A amylaseB ethanolC iodine solutionD hydrochloric acidwhy is water considered a vital ingredient of life? please give 1 reference link of your answer tooThe directions of Mannitol Salt agar was “suspend 28.9 grams in 1000 ml distilled water”. You will prepare 25 petri dishes of this medium, how many ml of distilled water do you need and how many grams of medium do you need to prepare? Show your solution.