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- Which statement(s) describe(s) a microplate reader?A. It is spectrophotometerB. It can read the absorbance of one sample with adjustable path lengthC. It can handle multiple samples in parallelD. It will do all measurement jobs without our supervision a. A & B b. A, B & C c. A, B, C & D d. A e. A & CNeed help Which of these could be used to measure the number of live bacterial cells in a liquid culture? a. do many serial dilutions of culture and plate on solid media b. measure the turbidity using a spectrophotometer c. examine one drop of culture under a microscope and gram stain d. measure the dry weight of cellsa) explain in your own words how to do a nitrate reduction test to identify unknown bacteria b) explain in your own words how to perform a phenol red broth (prb) test to help identify unknown bacteria
- Bacteria tend to stain more readily with cationic (positively charged) dyes because bacteria a. contain large amounts of alkaline substances c. are neutral b. contain large amounts of acidic substances d. have thick cell wallsWhich of the following statements is TRUE about the band of molecules labeled X ( close to where it says positive electrode). A) it contains DNA fragments that are shorter than the ones in any of the other bands. B) it contains fewer DNA molecules than any of the other bands from lane 3. C) it contains more negatively charged particles than any other band on the gel. D) it contains fewer genes than any of the other bands on the gel.You have just set your microscope up for use and turn it on. You can not see field of view. a.possible problems b.solutions
- Bacteria tend to stain more readily with cationic (positively charged) dyesbecause bacteriaa. contain large amounts of alkaline substances on their surfaces.b. contain large amounts of acidic substances on their surfaces.c. carry a neutral charge on their surfaces. d. have thick cell walls.Dyes are used to stain specimens that will be observed using the microscope to a. increase the magnification. b. increase resolution. c. increase contrast. d. make it visible. e. none of the above.A molecule into which a radioisotope has been incorporated can be used as an ____________. a. compound c. salt b. tracer d. acid
- More than one options may be correct for the attached question.Thanks. Which is correct about Gutta-Percha rubber: (a) A very hard material (b) A synthetic polymer (c) A trans 1,4-polyisoprene polymer (d) A 3-dimensional solidWhich of the following is NOT a function of the loading buffer used in SDS-PAGE? A) It contains a dye, letting you track the progression of electrophoresis samples B) It keeps the sample from floating away out of the gel well C) It measures the protein concentration of your samples D) It denatures proteins to turn them into linear chains of amino acidsWhich of the following is NOT an optical microscope? a. dark-field c. atomic force b. confocal d. fluorescent