Cell Biology Vocabulary and Questions

The primary structure of the cell membrane is:

• Phospholipid bilayer

• Protein layer

• Carbohydrate chain

• Nucleic acid strand

Identify the components of the cell membrane that identify foreign molecules.

• Proteins

• Lipids

• Carbohydrates

• Nucleic acids

What is the role of cholesterol in the cell membrane?

• It provides energy to the cell.

• It helps in the transport of proteins.

• It maintains membrane fluidity.

• It acts as a receptor for hormones.

What type of transport requires energy to move molecules against their concentration gradient?

• Passive transport

• Active transport

• Facilitated diffusion

• Osmosis

What process is described as cell-eating?

• Phagocytosis

• Pinocytosis

• Exocytosis

• Endocytosis

What is the function of receptor proteins in the cell membrane?

• To transport molecules across the membrane

• To catalyze biochemical reactions

• To receive and transmit signals

• To provide structural support

The cell membrane is described as a fluid-mosaic model because:

• It is composed of a phospholipid bilayer with embedded proteins that can move laterally.

• It is a rigid structure that does not allow movement of its components.

• It is made up of a single layer of lipids and proteins.

• It is impermeable to all substances.

What is the term for water-based fluid outside the cell?

• Intracellular fluid

• Extracellular fluid

• Cytoplasm

• Plasma

What do glycoproteins do?

What are the factors that determine if molecules can pass through?