Heating the onion root tip cells softens the cell walls and allows the acetocarmine stain to penetrate the cells. The stain then binds to the DNA in the cells, making the chromosomes visible under a microscope for easier observation and analysis in cell division studies.
To stain onion root tip cells with acetocarmine, first immerse the root tip in acetocarmine solution for a few minutes to allow the stain to penetrate the cells. Then, rinse the root tip with water to remove excess stain while retaining the stained cells. Mount the root tip onto a slide with a drop of water and cover with a coverslip for observation under a microscope.
The epidermal cells of an onion are located on the outermost layer of the onion bulb, forming a protective barrier.
Onion cells are approximately the same shape because they are packed tightly together in the layers of an onion bulb. The cell walls of onion cells help maintain their shape and structure. Additionally, the pressure exerted by neighboring cells contributes to their uniform appearance.
Cheek cells are typically larger than onion cells. Cheek cells are human epithelial cells that make up the inside lining of the mouth, while onion cells are plant cells found in the epidermis of onion bulbs. Cheek cells are usually around 30-40 micrometers in size, while onion cells are generally smaller at around 0.1-0.2 millimeters.
Chloroplasts can be seen in Elodea leaf cells but not in the epidermal cells of onion cells. Chloroplasts are responsible for photosynthesis in plant cells, containing chlorophyll that captures sunlight for energy production. Onion epidermal cells do not contain chloroplasts as they do not perform photosynthesis.
Acetocarmine is a DNA specific stain like feulgen stain, so the super coiled chromosomes during different stages of mitosis present in the Onion root tip cells can be visualized perfectly by treating with this stain.
To stain onion root tip cells with acetocarmine, first immerse the root tip in acetocarmine solution for a few minutes to allow the stain to penetrate the cells. Then, rinse the root tip with water to remove excess stain while retaining the stained cells. Mount the root tip onto a slide with a drop of water and cover with a coverslip for observation under a microscope.
Onion cells do not have chloroplasts because the onion is underground where there is no light. Without light chloroplasts have no purpose, so onion cells just don't have them.
All organisms are made of cells. An onion is and organism, hence all parts of an onion are made of cells.
No chloroplasts in cheek and onion cells
The cells in an onion tip but not the onion itself are usually actively dividing cells located at the growing tip of the onion root, known as the root cap cells. These cells help protect the delicate meristematic cells responsible for root growth and can often be found in the root zone of plants.
Between the 2 cells that are cheek and onion cells, the one that has a regular arrangement and structure are onion cells. Cheek cells have an irregular shape.
A yeast cell is a unicellular fungus, while an onion skin cell is part of a multicellular plant tissue. Yeast cells are typically oval or round and reproduce asexually through budding, whereas onion skin cells are rectangular and have a rigid cell wall made of cellulose. Additionally, yeast cells lack chloroplasts and do not perform photosynthesis, unlike onion cells, which contain chloroplasts for this purpose. Lastly, yeast cells have a more flexible cell membrane, while onion skin cells have a more rigid structure due to their cell wall.
The hypothesis of observing onion cells under a microscope could be that the onion cells will have a distinct rectangular shape and contain a visible nucleus.
A onion cell is : 0.2 mm
All cells have cytoplasm, so yes, onion cells have cytoplasm.
Potato cells have larger, more angular shape and contain starch granules, while onion cells are smaller and have a more rectangular shape with a distinct cell wall. Additionally, potato cells lack the characteristic onion cell layers seen in onion cells.