Please answer these questions ASAP if good then Brainlest! 1. Why is a plasma membrane important?

2. What is the structure of the phospholipid bilayer?

3. How do molecules get in and out of a cell?

4. What is the difference between endocytosis and exocytosis?

5. What are the differences between passive and active transport?

6. What happens during active transport?

1) The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. ... And those proteins which stick outside of the plasma membrane will allow for one cell to interact with another cell.

2) Phospholipid Bilayer. The phospholipid bilayer consists of two layers of phospholipids, with a hydrophobic, or water-hating, interior and a hydrophilic, or water-loving, exterior. The hydrophilic (polar) head group and hydrophobic tails (fatty acid chains) are depicted in the single phospholipid molecule

3)In facilitated diffusion, substances move into or out of cells down their concentration gradient through protein channels in the cell membrane.

4) Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane, and bringing it into the cell. Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell

5) The key difference between active and passive transport is that active transport forces molecules against the concentration gradient with help of ATP energy whereas passive transport let the molecules to pass across the membrane through a concentration channel

6) Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The particles move against the concentration gradient , using energy released during respiration

Explanation:

the answer is a or when it says crossing over

a time line cause it goes from 685 to 978