3. Which of the following statements is correctabout column chromatography?a) Resolution improves as column lengthincreasesb) Mobile phase is a porous solid material keptin the column with appropriate chemicalcharacteristicsc) Stationary phase is a buffered solution thatpercolates through the mobile phased) Large proteins exit the column faster thantiny proteins

The correct statement about column chromatography is: a) Resolution improves as column length…

Answered: 3. Which of the following statements is…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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1. A.) Which compound acts as dehydrating agent in Molisch's test? B.) With the correct answer above, what is its chemical function? 2. A.) Which compound is present in Fehling's A? B.) With the correct answer above, what is its chemical function? 3. A.) Which compound is present in Fehling's B? B.) With the correct answer above, what is its chemical function? 4. A.) Which compound acts as oxidizing agent in Benedict's Test? B.) With the correct answer above, what is its chemical function? 5. A.) Which compound acts as dehydrating agent in Bial's Test? B.) With the correct answer above, what is its chemical function?
Which of the following is not a method used to introduce foreign DNA into a bacterial cell? a) biolistic gun b) calcium chloride treatment followed by heat shock c) infection with a specific phage d) electroporation
4) In Gram Stain the bacteria that becomes colorless after washing with alcohol or acetone is the: a) Gram +ve bacteria b) Gram -ve bacteria c) ) Gram neutral bacteria d) archaebacteria e) b & c5) Antimetabolites include: a) Sulfonamides b) Tetracyclins c) Trimethoprim d) all of the above e) a and c6) Oil immersion is used in light microscope because: a) it increases  only b) it decreases  only c) it increases the / n sin  value d) it decreases / n sin  e) same refractive index as the glass slide
Regarding the use of animal cells in culture, it is correct to state that: * (a) Low cost culture media composed of mineral salts and amino acids are used (b) Cells must be kept in semi-solid media, allowing them to come into contact with the atmosphere rich in carbon dioxide. (c) Greenhouses with controlled temperature and atmosphere composed predominantly of carbon monoxide are used (d) On an industrial scale, culture media supplemented with serum of animal origin are used, which makes them media of indefinite composition (e) Culture media must not be sterilized by autoclaving, preferably filtration and/or ionizing radiation methods are used
When air is blown from mouth into a test – tube containing lime water, the lime water turned milky due to presence of –a) oxygenb) nitrogenc) water vapoursd) carbon – dioxide
QUESTION 13 13. How many minutes is an acceptable time for a centrifuge to spin blood specimens? a) 10 - 15 minutes b) 5 - 8 minutes c) 20 - 25 minutes d) 25 - 30 minutes QUESTION 14 1. What are the types of centrifuges? a)swinging-bucket or angled b)Fixed-head rotor c) Ultra-centrifuges d) all the answer are correct.
3. The bacterial isolated from the abscess was also used in the test shown below. (a) What is the name of this test? (b) What are you testing for? (c) Describe how you would evaluate the results of this type of test. (d) Based on the results of this test as shown below, should the doctor and patient be concemned? Explain! 4. What organism could be causing the patient's abscess? Explain your reasoning. Focus Mode + 100% D Focu DA 07:33 PM R. W 11/18/2020 0 日 9 search

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