Which structure in the cheek cells did you observe that separates and protects the cell from the environment?
Intercellular Junctions
| Cell Component | Function |
|---|---|
| Plasma membrane | Separates cell from external environment; controls passage of organic molecules, ions, water, oxygen, and wastes into and out of the cell |
| Cytoplasm | Provides structure to cell; site of many metabolic reactions; medium in which organelles are found |
What is the function of the cell wall in the onion cell?
Answer and Explanation: The cell wall of an onion cell functions as a structural part of the cell, offering support and protection for the fluids and organelles inside.
What is the function of the vacuoles you saw in the paramecium?
What is the function of the vacuoles you saw in the Paramecium? They store fluids, nutrients, and waste.
What organelles or cellular structures were common to all the different organisms looked at with the microscope?
Ribosomes are the organelles that are common to all the different organisms looked at with the microscope.
When observing the onion root no chloroplasts were observed within the cells Why?
The clear epidermal cells exist in a single layer and do not contain chloroplasts, because the onion fruiting body (bulb) is used for storing energy, not photosynthesis. Each plant cell has a cell wall, cell membrane, cytoplasm, nucleus, and a large vacuole.
Which cellular structure did you observe in the spirogyra but not in the other cells?
The spirogyra have a chloroplast which conducts photosynthesis.
What is nucleus function?
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.
Where is the nucleus found in an onion cell?
The nucleus is present at the periphery of the cytoplasm. The vacuole is prominent and present at the center of the cell, surrounded by cytoplasm.
Which nucleus has role in conjugation in paramecium?
The micronucleus is a storage site for the germline genetic material of the organism. It gives rise to the macronucleus and is responsible for the genetic reorganization that occurs during conjugation (cross-fertilization).
What is the function of the cytoplasm in a paramecium?
Once there is enough food accumulated a vacuole is formed inside the cytoplasm, circulating through the cell with enzymes entering the vacuole through the cytoplasm to digest the food material. Once the digestion is completed the vacuole starts to shrink and the digested nutrients enter into the cytoplasm.
What is the function of the nucleus?
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.
Which cell looks more clear when it is observed through a microscope Why?
In practical terms, bacteria and mitochondria, which are about 500 nm (0.5 μm) wide, are generally the smallest objects whose shape can be clearly discerned in the light microscope; details smaller than this are obscured by effects resulting from the wave nature of light.
When viewing a sample of onion cells using a microscope the student placed the cells on a slide and placed a coverslip over it what is the purpose of the coverslip?
Go light because too much will mean you can't see the cell well. Drop the Cover Slip– over the onion cells by placing one end of the cover slip into the iodine and dropping the other side down. This helps to prevent bubbles.
When looking at an onion cell under a microscope a thin slice of onion tissue is placed on a slide?
When looking at an onion cell under a microscope, a thin slice of onion tissue is placed on a slide, a small drop of dye is placed on the tissue. What should be done next? The onion is cut into thin slices. A coverslip is placed over the onion tissue.
What organelles visible in Spirogyra are not visible in amoeba and paramecium?
what organelles visible in spirogyra are not visible in Amoeba and Paramecium? Choloroplast is visible in spirogyra and not visible in amoeba and paramecium.
Which structure did you see in the eukaryotic cells that is absent in the prokaryotes quizlet?
A difference between Eukaryotic and Prokaryotic is that eukaryotic have organelles, for example, a nucleus. Prokaryotic cells do not have a nucleus. Another difference between single celled and multi-celled organisms is that eukaryotic cells have organelles in them called chloroplasts.
What are 3 functions of the nucleus?
The primary functions of the nucleus are to store the cell's DNA, maintain its integrity, and facilitate its transcription and replication.
What is the function of the nucleus quizlet?
What is the general function of the nucleus? The general purpose of the nucleus is to predetermine and control the production of proteins. It does this by storing the protein code in the DNA, which is hereditary.
Do all cells have a nucleus?
Only the cells of advanced organisms, known as eukaryotes, have a nucleus. Generally there is only one nucleus per cell, but there are exceptions, such as the cells of slime molds and the Siphonales group of algae. Simpler one-celled organisms (prokaryotes), like the bacteria and cyanobacteria, don't have a nucleus.
What is the function of the small nucleus in a Paramecium?
The micronucleus is a storage site for the germline genetic material of the organism. It gives rise to the macronucleus and is responsible for the genetic reorganization that occurs during conjugation (cross-fertilization).
Which nuclei is used for reproduction in Paramecium?
During sexual reproduction, the micronuclei of each paramecium undergo meiosis, ultimately halving the genetic content to create a haploid nucleus. These are exchanged between the two connected mates. The haploid nuclei from each mate fuse to create a new, genetically varied, micronucleus.
What does the nucleus do in a paramecium?
The large nucleus is called the macronucleus which controls cell activities such as respiration, protein synthesis and digestion. Color the macronucleus red. The much smaller micronucleus is used only during reproduction.
What is the function of chloroplasts in euglena?
Chloroplasts within the euglena trap sunlight that is used for photosynthesis and can be seen as several rod-like structures throughout the cell.
What is the function and structure of nucleus?
The cell nucleus is a membrane-bound structure that contains a cell's hereditary information and controls its growth and reproduction. It is the command center of a eukaryotic cell and is usually the most notable cell organelle in both size and function.
How do you observe nucleus under a microscope?
Methylene blue is used to stain the nucleus while observing cheek cell. It has a strong affinity for both DNA and RNA which causes clear staining of nucleus and increases its visibility under microscope.
When looking at an onion cell under the microscope a thin slice of onion tissue is placed on a slide and a small drop of dye is placed on the tissue what should be done next?
When looking at an onion cell under a microscope, a thin slice of onion tissue is placed on a slide, a small drop of dye is placed on the tissue. What should be done next? ? A coverslip is placed over the onion tissue.
What is the observation of onion cell?
Observations. There are a large number of regularly shaped cells lying side by side and each cell has a distinct cell wall. A distinct nucleus is present on the periphery of each cell. Lightly stained cytoplasm is observed in each cell.
When looking at an onion cell under a microscope a thin slice of onion is placed on a slide and a small drop of dye is placed on the tissue what should be done next?
When looking at an onion cell under a microscope, a thin slice of onion tissue is placed on a slide, a small drop of dye is placed on the tissue. What should be done next? The onion is cut into thin slices. A coverslip is placed over the onion tissue.
What does an onion cell observe?
Large, rectangular interlocking cells, Clearly visible distinct cell walls surrounding the cells, Dark stained nucleus, Large vacuoles at the center, Small granules may be observed inside the cells (within the cytoplasm)
Are nuclei visible in Spirogyra cells?
Spirogyras have cell walls, nuclei, pyrenoids, and notable spiral chloroplasts that resemble a spring or a helix. Species – There are approximately 400 species of Spirogyra known today.