which of the following changes in the plasma membrane of a salmon is most likely to occur as it migrates to a much colder the Pacific Ocean? Hint: the fluidity of the salmon's plasma membranes must remain relatively constant during its migration. The percentage of integral membrane proteins in the plasma membrane would increase The percentage of unsaturated fatty acid tails in plasma membrane phospholipids would increase The percentage of unsaturated fatty acid tails in plasma membrane phospholipids would decrease The percentage of peripheral membrane proteins in the plasma membrane would increase

Aldosterone is a steroid hormone that freely enters the target cells to act within the cell. Epinephrine is a polar monoamine (amino acid) hormone that interacts with receptors on the cell's surface. What accounts for this difference? [Select any/all that apply.] Steroids are charged and hydrophilic, so aldosterone passed through a transport protein. Steroids are hydrophobic so aldosterone passed through the membrane by simple diffusion. Epinepherine (amino acid) hormone is hydrophilic, so it cannot diffuse through the phospholipid bilayer. Epinepherine (amino acid) hormone could diffuse through the phospholipid bilayer but it is attracted to the receptor protein.

The plasma membrane has a hydrophobic interior due to the two present in each phospholipid found in the phospholipid bilayer of the cell membrane. The plasma membrane allows some molecules to cross but not all. Therefore, the plasma membrane is said to be Molecules that are nonpolar and hydrophobic will cross the membrane with ease by Does this process require energy? When molecules move across the plasma membrane by passive transport, they will move down or with the_ from an area of concentration to an area of. concentration. Polar, hydrophilic molecules and charged ions will move across the plasma membrane by the process of_ This does not require energy, but it does require a A special case of diffusion is known as which is the movement of water across the plasma membrane. If a cell is placed into a solution that is hypertonic compared to the inside of the cell, the cell would If a cell is placed into a hypotonic solution compared to the inside of the cell, the cell water. would…

Lipid rafts are microdomains in the plasma membrane that function as a stable platform for signaling and trafficking. Which of the following helps make the lipid rafts more stable and less mobile? phospholipid cholesterol sphingolipid a and b b and c