Question

1. which types of cells have a cell membrane?
2. true or false: the phospholipid bilayer is also referred to as the fluid mosaic model.
3. what is the purpose of the cell membrane?
4. what are the 3 components of a phospholipid?
5. describe how phospholipids are arranged in the cell membrane.
6. what does it mean that the cell membrane is selectively permeable?
7. what molecules can be found in the cell membrane (list 4)?

Explanation:

1. All cells, including prokaryotic and eukaryotic cells, have a cell - membrane as it is a fundamental structure that encloses the cell contents.
2. The fluid - mosaic model describes the structure of the cell membrane where the phospholipid bilayer is a key component, but the phospholipid bilayer alone is not referred to as the fluid - mosaic model. So, it is False.
3. The cell membrane serves functions such as protecting the cell, regulating the movement of substances in and out of the cell (selective permeability), and facilitating cell - cell recognition and communication.
4. A phospholipid has three components: a glycerol backbone, two fatty acid tails, and a phosphate - containing head group.
5. Phospholipids in the cell membrane are arranged in a bilayer with the hydrophilic phosphate heads facing outward (towards the aqueous environment inside and outside the cell) and the hydrophobic fatty acid tails facing inward, away from the water.
6. Selective permeability means that the cell membrane allows certain substances (such as small, non - polar molecules and some water) to pass through while restricting the passage of others (such as large, polar molecules and ions).
7. Molecules found in the cell membrane include phospholipids, cholesterol, proteins (integral and peripheral), and glycolipids.

Answer:

1. All cells (prokaryotic and eukaryotic)
2. False
3. Protects the cell, regulates substance movement, and facilitates cell - cell recognition/communication
4. Glycerol backbone, fatty acid tails, phosphate - containing head group
5. Arranged in a bilayer with hydrophilic heads outward and hydrophobic tails inward
6. Allows certain substances to pass while restricting others
7. Phospholipids, cholesterol, proteins, glycolipids