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The stems of woody plants have an outer layer called bark. Bark contains layers of dead cells called cork.
Plant cells have a non-living cell wall surrounding the living contents (cytoplasm, nucleus etc). The cells walls of the cork cells contain a waxy material called suberin. This is waterproof and so reduces the loss of water from the stem.
However suberin also prevents the cork cells from obtaining water, so the living contents of the cells die and disintegrate, leaving the empty cell walls.
So, when Hooke observed cork cells they were empty because they had lost their living contents and all he was seeing were the cell walls.
What else can I help you with?
What substance is visible under a light microscope as a cell divides?
Chromosomes, made up of DNA and proteins, are visible under a light microscope as a cell divides. They appear as distinct structures within the cell during stages such as prophase, metaphase, anaphase, and telophase of mitosis.
How does a cell look under a microscope?
It depends on what cell you are looking at.
Are cell membranes visible under a microscope?
Cell membranes are not typically visible under a light microscope because they are thin and transparent. However, special staining techniques or electron microscopy can be used to make cell membranes visible.
Can you see cell walls?
only under a microscope
When do chromosomes appear as threadlike bodies?
Chromosomes appear as threadlike bodies during cell division, specifically during the metaphase stage of mitosis or meiosis. This is when the chromosomes condense and become visible under a microscope.
How would an algae cell appear under different types of microscopes?
Under a light microscope, an algae cell may appear as a green, oval-shaped structure with chloroplasts. Under a scanning electron microscope, the cell would show more details of its surface structure. Under a transmission electron microscope, the internal structures of the cell, such as the nucleus and mitochondria, would be visible in high resolution.
How do cells of the onion specimen appear under the microscope?
Cells of an onion specimen appear rectangular or square in shape, with distinct cell walls forming the outer boundary. These cells also contain a large central vacuole that may appear as a clear, empty space in the center of the cell under the microscope. The cells are tightly packed together in a regular pattern, creating a characteristic appearance when viewed at high magnification.
Why did Robert hooke's cork cells appear to be empty?
Robert Hooke's cork cells appeared empty because he was observing dead cell walls. Live cells have contents that can be easily seen under a microscope, but in cork cells, the living material had decayed and left behind only the empty cell walls, making them appear hollow.
How will describe onion cell under the compound light microscope?
Under a compound light microscope, an onion cell will appear as a rectangular shape with a distinct cell wall and nucleus. The cell cytoplasm will be visible, with small structures such as vacuoles dispersed throughout. The onion cell may also have a clear membrane visible around the cell wall.
What substance is visible under a light microscope as a cell divides?
Chromosomes, made up of DNA and proteins, are visible under a light microscope as a cell divides. They appear as distinct structures within the cell during stages such as prophase, metaphase, anaphase, and telophase of mitosis.
What is the shape and color of the onion cell?
When observing an onion cell under the microscope, it appear to be long an oval in shape. Staining the cell will make the chromosomes attain a deep purple color.
What scientist was credited for naming the biological structure a cell?
The term "cell" was coined by Robert Hooke in 1665, who observed empty cell walls in a thin slice of cork under a microscope and likened them to the cells of a monastery.
How does a cell look under a microscope?
It depends on what cell you are looking at.
How can you prove that a cell is eukaryote?
You can examine the cell under a light microscope. Eukaryotic cells have nuclei, and these should be visible under a light microscope.
Why can we just see vacuole nucleus cell membrane and cell wall in onion cell under light microscope and not other organelles?
This is because the vacuole, nucleus, cell membrane, and cell wall are large enough to be seen under a light microscope due to their size and contrast with the surrounding cytoplasm. Other organelles, such as mitochondria and chloroplasts, are smaller and have similar refractive index to the cytoplasm, making them harder to distinguish under a light microscope.
Which organelle in a eukaryotic cell is most noticeable under a microscope?
The nucleus is the most noticeable organelle in a eukaryotic cell under a microscope due to its size and distinct structure. It appears as a large, round structure typically located in the center of the cell.
Which organelle in a eukaryotic cell is most noticeable under A a microscope?
The nucleus is most noticeable under a microscope.
