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Why onion cells were stained with iodine but rhubarb cells were not?
Onion cells were stained with iodine because they contain starch, which reacts with iodine to produce a blue-black color, allowing for better visualization of the cells. In contrast, rhubarb cells do not contain significant amounts of starch, so staining with iodine would not yield a noticeable color change, making it unnecessary for observation. Thus, iodine staining is used selectively based on the presence of starch in the cells being examined.
Is glucose expected to have a positive iodine test?
Yes, glucose is expected to give a positive iodine test. Iodine reacts with glucose to form a blue-black color, indicating the presence of reducing sugars in the sample.
What color is gram negative stain and gram positive stain if you forget to apply iodine?
If iodine is not applied, both the gram-positive and gram-negative stains will appear to be gram-negative. The iodine acts as a mordant that helps to fix the crystal violet stain in the gram-positive bacteria, making them appear purple. Without iodine, the crystal violet stain can be easily washed out of both gram-positive and gram-negative bacteria, resulting in a pink or red color.
What is the positive color reaction starch is present?
Use an iodine solution. it should be orange to brown to begin with, if there is a starch present, it will turn blue-black.
What could you say about a substance if it did not turn blue-black with iodine?
While presence of starch is indicated by the bluish-black color change of a substance with the introduction of Iodine, it doesn't necessarily mean the absence of starch is the substance doesn't become blue or black in color. If a substance doesn't become blue or black in color on the application of iodine, it means the substance doesn't form any complex with Iodine. Generally, when a substance creates a complex with Iodine, it is in blue color.
What is positive color for iodine test?
The positive color for the iodine test is a dark blue or black color. This color change indicates the presence of starch in the test substance.
After iodine is added to the slide what color do cells appear?
Cells will appear blue or purple after iodine is added to the slide. The iodine reacts with starch in the cells, resulting in a color change that helps to visualize the cellular structures.
If you stain a wet mount of living cells with iodine what are you most likely to see under a microscope?
Iodine is commonly used to stain starch granules within cells. Therefore, if you stain a wet mount of living cells with iodine, you are most likely to see starch granules within the cells stained with a dark color under the microscope.
Do proteins give positive iodine tests?
Yes, proteins can give a positive iodine test. When iodine reacts with proteins, it forms a complex that results in a brown color change, indicating a positive test for proteins.
Why onion cells were stained with iodine but rhubarb cells were not?
Onion cells were stained with iodine because they contain starch, which reacts with iodine to produce a blue-black color, allowing for better visualization of the cells. In contrast, rhubarb cells do not contain significant amounts of starch, so staining with iodine would not yield a noticeable color change, making it unnecessary for observation. Thus, iodine staining is used selectively based on the presence of starch in the cells being examined.
How did the iodine solution affect the image of the onion cells?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
How did iodine solution affect the image of the onion cells?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
How did the iodine solution affect the image of the onion cells.?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
How did the iodine solution affect the image the onion cells?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
How did the iodine solution affect the image of the of onion cells?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
How did the iodine solution affect the image of onion cells?
there will be change in the color for iodine into blue,black because of the presence of starch in it.
Is glucose expected to have a positive iodine test?
Yes, glucose is expected to give a positive iodine test. Iodine reacts with glucose to form a blue-black color, indicating the presence of reducing sugars in the sample.
