How do photopigments separate when performing paper chromatography? Most soluble pigment will stay lower on the paper Heavier pigment will stay lower on the paper Most soluble pigment will stay higher on the paper Heavier pigment will stay higher on the paper
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- What is the working electrode used for polarography technique? a. Platinum b. Silver c. Gold d. Dropping Mercury Electrode (DME)You can see your cells using the scanning and the 10x objective lenses. You cannot focus on anything when you add oil to your slide and move to the oil immersion objective. Your instructor comes over and wipes off your oil, turns over the slide, adds new oil, and moves the oil immersion objective into place. You can now focus on your cells. Knowing how immersion works, why couldn't you see the cells when the slide was upside down?Which of the following is/are source/s of error in performing a spectrophotometric method? Answer all that apply. Sample is turbid when the absorbance is read. The absorbances were read at maximum absorption. Standard solutions are prepared accurately. The cuvettes have fingerprints.
- In negative staining, the acidic stain will penetrate the cell. In negative staining, it will create a dark background. a. First statement is TRUE, Second statement is FALSE. b. First statement is FALSE, Second statement is TRUE. c. Both statements are TRUE. d. Both statements are FALSE.What are the processes of concentrate samples analysis in Uv-visible spectroscopy? Please shortly answer at your own words(3-4 lines).Which spectrophotometer mode should you use to calibrate the instrument and which mode should you use to read your samples? Transmittance for both Absorbance for both Absorbance to calibrate and transmittance to read samples Transmittance to calibrate and absorbance to read samples Flip a coin to pick a mode each time.
- You should always position the cells or tissues in the center of view before increasing magnification, because... You know that the image will move right as you move the slide to the left. You know that the image will move up as you move the slide down. You know that the center of the field of view will be unchanged. This is the best way to avoid breaking the slide with an objectiveA student using a microscope measured the low power field diameter to be 7.1mm. The student then switched from the low power (4x) objective lens to the medium-power (10x) objective lens. Assuming a 10 x ocular (eyepiece) lens, the medium power field diameter is ____ um um is micrometersWhy do some scientists use immersion fluids when looking at their microscope slides? Increases the working distance Keeps the sample alive Collects a narrower band of light Takes advantage of lower refractive index Increases the numerical aperture
- When trying to focus an object on the microscope, you always begin with the ________________ objective lens and use __________________ adjustment knob to bring the object in focus. Once object is focused, high power objective lens can be used to magnify the object, and only use the ___________________ adjustment knob to focus at this point. a scanning; coarse; fine b low power; coarse; fine c low power; fine; coarse d scanning, fine; coarseSal said that the microscope had a total of 400x magnification because the eye tube had a level of 10x and the objective lens had a magnification of 40x. Is sal correctWhen using the 10x lens to view a specimen, what is the total magnification of the specimen to the eye? A. 10x B. 100x C. 400x D. 1000x