Question

the edges of many of the epidermal cells may be folded over. 17. what does this indicate about the thickness of these cells? 18. how do the size and shape of a human epidermal cell differ from those of elodea and onion cells? 19. why do elodea and onion cells have more consistent shapes than human epidermal cells? part 5. protists amoeba is an irregularly shaped protist with many internal organelles. amoeba move by extensions of their cell membrane called amoeboid motion. this occurs by means of pseudopodia, temporary protrusions of the cell. pseudopodia also surround food particles and create food vacuoles. another important structure in the amoeba is the contractile vacuole that accumulates and expels water and waste products. obtain a prepared slide of amoeba and view it under the 10x or 40x objective. sketch a cell in the space provided below. label the nucleus and plasma membrane. total mag. 100x 20. does an amoeba have a cell wall? how can you tell? 21. list three structures that are common to both an amoeba and a plant cell. list two structures that are different.

Explanation:

1. Folded - over edges suggest the cells are thin enough to fold easily.
2. Human epidermal cells are generally flatter and more irregular in shape compared to the more rectangular and regular - shaped Elodea and onion cells. Elodea and onion cells are plant cells with a more defined shape due to the cell wall. Human epidermal cells are animal cells without a rigid cell wall.
3. Elodea and onion cells have cell walls which provide structural support and maintain a more consistent shape. Human epidermal cells lack a cell wall, so their shape can be more variable.
4. An Amoeba does not have a cell wall. This can be told by its ability to change shape (amoeboid motion) freely. A cell wall would restrict such shape - changing ability.
5. Common structures: nucleus, cytoplasm, plasma membrane. Different structures: plant cells have a cell wall and chloroplasts, while Amoeba does not.

Answer:

1. The cells are thin.
2. Human epidermal cells are flatter and more irregular; Elodea and onion cells are more rectangular and regular due to cell walls.
3. Elodea and onion cells have cell walls providing structural support for consistent shape; human epidermal cells lack cell walls.
4. No. Its ability to change shape freely indicates lack of a cell wall.
5. Common: nucleus, cytoplasm, plasma membrane. Different: plant cells have cell wall and chloroplasts; Amoeba does not.