The cell membrane is _ , meaning that it’s picky about what it lets in and out. _ are scattered across the _ bilayer that help assist the membrane's job of allowing only certain substances in and out of the cell.
Word Bank:
proteins, triglyceride, carbohydrates, phospholipid, selectively-permeable, permeable
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Blank 1: selectively-permeable
Blank 2: proteins
Blank 3: phospholipid
Blank 1: selectively-permeable
Blank 2: proteins
Blank 3: phospholipid
Blank 1: selectively-permeable
Explanation: The cell membrane is selectively-permeable, which means it carefully selects and controls what substances can enter or exit the cell. This allows the cell to maintain a stable internal environment.
Blank 2: proteins
Explanation: Proteins are scattered across the lipid bilayer of the cell membrane. These proteins play a crucial role in the membrane's job of regulating the movement of substances in and out of the cell. There are different types of proteins in the cell membrane, such as transport proteins, channel proteins, and receptor proteins, each with a specific function.
Blank 3: phospholipid
Explanation: The cell membrane is composed of a lipid bilayer made up of phospholipids. Phospholipids have a hydrophilic (water-attracting) head and hydrophobic (water-repelling) tails. This arrangement forms a barrier that separates the watery environment inside and outside of the cell. The phospholipids create a foundation for the membrane's structure and help in maintaining its selective permeability.
Carbohydrates and triglycerides are not directly involved in the cell membrane's selective permeability. Carbohydrates may be attached to the proteins or lipids on the outer surface of the membrane and play a role in cell recognition and cell-cell interactions. Triglycerides, on the other hand, are a type of lipid but do not have a significant role in the cell membrane's selective permeability.