Which statement is true about the plasma membrane?
a. the proteins make up the matrix of the membrane.
b. the model can be likened to a sandwich where phospholipids are like the bread and proteins are like the filling.
c. the fluid nature of the membrane is regulated by flip-flopping of the phospholipids from one side of the membrane to the other.
d. proteins and phospholipids can move sideways within the plane of the membrane.

The correct answer is option D.

Explanation:

The plasma membrane is the outer membrane of the cell that surrounds the cytoplasm and other cell organelles found in it. The plasma membrane acts as a barrier between the outside of the cell and the inner side of the cell. This membrane has a lipid bilayer and has a hydrophilic head and hydrophobic tail.

Phospholipids and many membrane proteins are moves in lateral or transverse motion, movement of lipids and proteins called lateral diffusion.

Thus, the correct answer is option D.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.