Cellular Transport Quiz25f

What is the primary function of the cell membrane?

• A) Producing energy
• B) Controlling what enters and exits the cell
• C) Storing genetic information
• D) Providing structural support like a cell wall

What is the main structural component of the cell membrane?

• A) Carbohydrates
• B) Phospholipids
• C) Proteins
• D) Nucleic acids

The cell membrane is often described as a fluid mosaic because:

• A) It is made of solid, rigid structures
• B) It has a fixed shape and does not move
• C) Its components, like lipids and proteins, move freely within the layer
• D) It is completely permeable to all substances

What type of molecules can pass through the cell membrane without the help of transport proteins?

• A) Large, charged molecules
• B) Small, nonpolar molecules like oxygen and carbon dioxide
• C) Ions like sodium and potassium
• D) Glucose and amino acids

Which of the following best describes the role of proteins in the cell membrane?

• A) They provide energy for the cell
• B) They serve as channels, receptors, and enzymes
• C) They make up the majority of the lipid bilayer
• D) They store genetic information

The cell membrane is described as a bilayer because it consists of:

• A) Two layers of proteins
• B) Two layers of phospholipids
• C) Two layers of carbohydrates
• D) Two layers of nucleic acids

What part of a phospholipid is hydrophobic?

• A) Phosphate head
• B) Lipid tail
• C) Protein channel
• D) Carbohydrate chain

Which part of the phospholipid is hydrophilic?

• A) Fatty acid tails
• B) Phosphate head
• C) Integral proteins
• D) Cholesterol molecules

What is number 1 in the diagram below of the cell membrane?

• protein
• cholesterol
• carbohydrate
• phospholipid

What is the function of cholesterol in the cell membrane?

• A) Provides energy for active transport
• B) Helps maintain fluidity and stability
• C) Facilitates diffusion of ions
• D) Attaches carbohydrates to proteins