Question

station 3 the cell membrane

1. epithelial cells (skin). what is (cm)?
2. close up of cell membrane. here you can see the double - layered membrane. what macromolecule is found in the cell membrane?
3. paramecium. looking at the arrows, what indications do you see that this is dying?
4. protozoan. this organism is covered in cilia, which helps the organism to move.
5. blood cells. wbcs kill and destroy foreign material. they have lots of lysosomes in them (the tiny dots). what do lysosomes do?
6. blood cells. close up of a wbc, the cell membrane has lots of proteins attached to it, to help recognize foreign materials. the rbcs appear to be smiling, because they are super thin in the middle allowing extra space to carry oxygen.
7. white blood cell. rudolf virchow was a german doctor. one of virchow’s many discoveries was being the first to recognize leukemia (a blood cancer). he also recognized the cell as the basic unit of structure and function in all living things and is known for his theory of 1858, omnis cellula e cellula (latin for “every cell originates from another existing cell like it”). here you can see a wbc attached to a foreign body to destroy it. why do wbcs not always attack cancer cells?
8. onion cell. top image is a normal onion cell. what organelles do you see? the bottom image is after soaking the cells in salt water, causing the cell membrane to shrink away from the cell wall.

Explanation:

1. CM likely stands for cell membrane. Epithelial cells have a cell - membrane which is a crucial structure.
2. Lipids are a major macromolecule in the cell membrane, forming the lipid - bilayer.
3. Indications of a dying paramecium could include membrane disruption or abnormal movement patterns.
4. Not a question requiring an answer here. Just a description of a protozoan with cilia.
5. Lysosomes contain digestive enzymes that break down foreign material, waste products, and cellular debris.
6. Not a question requiring an answer here. Just a description of white and red blood cells' features.
7. Cancer cells can sometimes evade the immune system (including WBCs) because they can disguise themselves as normal cells, produce immunosuppressive factors, or the immune system may be weakened.
8. In an onion cell, one can see the nucleus, vacuole, and other organelles. When soaked in salt - water, plasmolysis occurs causing the cell membrane to shrink from the cell wall.

Answer:

1. Cell Membrane
2. Lipids
3. Membrane disruption/abnormal movement
4. Break down foreign material, waste products, and cellular debris
5. Cancer cells can disguise themselves, produce immunosuppressive factors, or the immune system may be weakened
6. Nucleus, vacuole (and other organelles)