The Cell Membrane

What is the primary role of the cell membrane in a cell?

• To store genetic material

• To produce energy for the cell

• To control the movement of substances into and out of the cell

• To provide structural support to the cell's interior

Which of the following are key components of the extracellular matrix?

• Lipids, DNA, and RNA

• Proteins, carbohydrates, and water

• Glycerol, fatty acids, and phosphate

• Enzymes, hormones, and vitamins

A phospholipid molecule, a key component of the cell membrane, is composed of which three main parts?

• A sugar, a protein, and a nucleic acid

• A glycerol, a phosphate group, and two fatty acids

• An amino acid, a peptide bond, and a carboxyl group

• A glucose, a fructose, and a galactose

What is the name of the model that scientists use to describe the cell membrane?

• The fluid mosaic model

• The rigid mosaic model

• The large mosaic model

• The small mosaic model

What is the function of glycoproteins on the surface of cells?

• To provide structural rigidity to the cell

• To store excess energy for the cell

• To help the immune system distinguish our own cells from harmful invaders and aid cell communication

• To transport water molecules across the membrane

What type of membrane protein helps control the movement of substances into and out of the cell by opening and closing?

• Junction proteins

• Enzymes

• Transport proteins

• Receptor proteins

Which process describes the movement of a chemical from an area of higher concentration to an area of lower concentration without requiring energy?

• Active transport

• Osmosis

• Diffusion

• Endocytosis

Glucose, a water-loving molecule, moves across the cell membrane with the help of a transport protein but without requiring cellular energy. What is this process called?

• Simple diffusion

• Facilitated diffusion

• Active transport

• Exocytosis

What type of cellular transport requires energy (ATP) to move substances, often against their concentration gradient?

• Passive transport

• Osmosis

• Diffusion

• Active transport

True or False - Exocytosis is the process when things are taken out of the cell and Endocytosis is the process when things are taken into the cell

• True

• False