All cell are surrounded by membranes. The main role of the cell membrane is to

A.regulate the cell's interactions with the environment
b.release any type of molecule out of the cell
c.arrange the cell's organelles in the cytoplasm
d.prevent water from leaking out of the cell

What type of molecule embedded in the cell membrane allows larger molecules to pass through the membrane by active transport
A phospholipids
b Proteins
c ATP
D carbohydrates

Q 1 A if B not all

To answer the first question about the main role of the cell membrane, we can use our knowledge about cell structure and function. The cell membrane, also known as the plasma membrane, acts as a barrier that separates the internal content of the cell from the external environment. Its main role is to regulate the cell's interactions with the environment. This allows the cell to selectively control what substances enter or exit the cell, maintaining a stable internal environment.

To answer the second question about the type of molecule embedded in the cell membrane that allows larger molecules to pass through by active transport, we need to understand the concept of active transport and the components of the cell membrane.

Active transport is a process that requires the cell to expend energy in order to move molecules against their concentration gradient. This process is facilitated by proteins embedded within the cell membrane, called carrier or transport proteins.

These transport proteins can exist in different forms, such as uniporters, symporters, or antiporters. One specific type of transport protein, called ATP-powered pumps or ATPases, utilize ATP (adenosine triphosphate) as an energy source to actively transport larger molecules across the cell membrane.

Therefore, the correct answer is b) Proteins. Proteins embedded in the cell membrane enable active transport of larger molecules by utilizing ATP. Phospholipids make up the structure of the cell membrane but do not directly participate in the active transport process. ATP is an energy molecule used by the cell, while carbohydrates mainly play a role in cell-to-cell recognition rather than active transport.