Cell Biology CA I

5. The membrane is primarily composed of phospholipids, with hydrophilic polar heads facing outward and hydrophobic tails facing inward.
10. Each channel is specific to certain ions or molecules, e.g., sodium (Na⁺), potassium (K⁺), or calcium (Ca²⁺) ions.

1. Small molecules like ions, water, and nutrients can diffuse through the cytoplasmic sleeve without requiring energy.
2. composed mainly of a pectic compound which appears to be a mixture of calcium and magnesium pectate.
3. Which model has a phospholipid bilayer surrounded by two layers of proteins, on the inner and outer surfaces.
4. which receptor involved in growth and differentiation.
6. which protein span the entire lipid bilayer and are involved in functions like transport, signaling, and enzymatic activity.
7. in secondary cell walls makes tissues like wood resistant to pests and environmental stress.
8. A matrix of polysaccharides like xyloglucan and arabinoxylan, which link cellulose fibers and provide flexibility.
9. primary wall may change its shape and volume according to the growth of.