LIFE SCIENCE LABORATORY ANIMAL CELL STRUCTURES blue Human epithelial cells are e
ID: 143680 • Letter: L
Question
LIFE SCIENCE LABORATORY ANIMAL CELL STRUCTURES blue Human epithelial cells are easily obtained from inside your mouth. Place a small drop of methylene stain on a glass slide. Gently serape the end of your toothpick with your sample into the drop of methylene blue and stir. Place a cover slip onto the slide and observe. The plasma membrane, cytoplasm, and nucleus should be visible. Draw and label the structures you see in Fig. 2.3 and based on your observations, answer inside of your cheek with the broad end of a toothpick. Dip the the questions that follow. Flg. 2.3 Anlmal Cells 0 10x 40x Shape Regularity Notice that the cells occur singly or in irregular clumps. Do the cels have a fixed, regular shape? NO If not, why not (ie what causes them to be different from the regularly shaped plant cells)? Some or What term(s) best describes their shape? weird Shape What is the structure forming the outer boundary of the cell called? Observe the single, darkly stained structure lying well inside the cell. On the basis of its singular nature, its size and position, what do you think this structure is called? What important functions does this structure perform? Are chloroplasts present? Is a large central vacuole present?Explanation / Answer
Ans 1. The darkly stained structure lying inside the cell is called nucleus.
2.funtions of nucleus-Nucleus contain the cell hereditary material called DNA for transcription and replication. It also controls the cells' other activities like growth and metabolism of the cell, protein synthesis and cell division also.
3. No chloroplast is present.
No central vaculole is present.
Part 2
1. When water flow into an animal cell, water will enters the cell as a result of osmosis and it causes the cell to expand. Since animal cells do no have cell wall, when too much water enters the cell it sometime causes the cells to burst.
2 . when water flows out of the cell, it happens because of the osmosis forces water out of the cells and it causes cells to become shrink in size.
Part 3. 1.Structures common to plant and animal cella:Nucleus, Mitochondria, ER, Golgi apparatus, Cytoplasm and Cytoskeleton.
2. Structures plant cells have but animals cells do not have:plastids, cell wall, large central vacuole.
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