A&P session I (chapter 3)

Which of the following is NOT a component of the plasma membrane?

• Phospholipid bilayer

• Carbohydrates

• Nucleus

• Proteins

Imagine you are a scientist studying cell structures. You are particularly interested in the plasma membrane. Which component of the plasma membrane would you say is responsible for stabilizing the membrane and preventing it from becoming too fluid at high temperatures?

• Integral protein

• Phospholipid bilayer

• Cholesterol

• Glycocalyx

Glycoproteins and glycolipids are involved in:

• Anchoring the plasma membrane to the cytoskeleton

• Transporting ions across the membrane

• Breaking down cellular waste products

• Cell signaling and recognition

Imagine you are studying the structure of a cell membrane. The part of a phospholipid molecule in this membrane that is hydrophilic and polar is:

• The fatty acid tails

• The phosphate head

• The cholesterol molecule

• The integral protein

Which type of membrane protein spans the entire width of the lipid bilayer and helps transport substances across the membrane?

• Glycoproteins

• Enzymes

• Integral proteins

• Peripheral proteins

What role do peripheral membrane proteins NOT play in the plasma membrane?

• Anchoring the membrane to the cytoskeleton

• Transporting nutrients across the membrane

• Facilitating cell-cell attachment

• Acts as enzymes

Which type of cell junction forms a barrier between adjacent cells, preventing the leakage of fluids and molecules between them?

• Gap junction

• Tight junction

• Desmosome

• Plasmodesmata

Which type of cell junction is often found in tissues that experience mechanical stress, such as skin and cardiac muscle?

• Gap junction

• Desmosome

• Plasmodesmata

• Tight junction

Imagine you are a doctor explaining to a patient. How would you describe the primary role of tight junctions in the digestive tract?

• They act like security guards, preventing the leakage of digestive enzymes and bacteria into the bloodstream

• They act like a sponge, promoting nutrient absorption in the intestines

• They act like a pacemaker, facilitating muscle contractions in the stomach

• They act like a telephone line, ensuring electrical communication between intestinal cells

Which cell junction type allows for the direct exchange of ions and small molecules between adjacent cells?

• Tight junctions

• Hemidesmosomes

• Desmosomes

• Gap junctions