PC 1: Cell Membrane and Cytoskeleton

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Which junction is involved in regulating movement across membranes and other epithelial structures?

Anchoring junction
Hemidesmosome
Desmosome (correct)
Adherens junction

Which component of an anchoring junction binds to intermediate filaments?

Integrin
Plaque (correct)
Basement membrane
Cadherins

Which type of junction connects cells to the basement membrane and underlying connective tissue?

Hemidesmosome (correct)
Anchoring junction
Adherens junction
Desmosome

Which type of junction connects with microfilaments formed from actin?

Adherens junction (D) Signup and view all the answers

Which cytoskeletal structure is responsible for trafficking of organelles and cell division?

Microtubules (D) Signup and view all the answers

According to the text, which of the following is true about osmosis?

Water is free to move across the membrane (B) Signup and view all the answers

What is the function of the Na+/K+ ATPase?

All of the above (D) Signup and view all the answers

Which type of transport requires energy?

Active transport (A) Signup and view all the answers

What is the role of aquaporins?

To facilitate passive transport of molecules (D) Signup and view all the answers

Why are cell membranes semipermeable?

To allow water and many other solutes to traverse them (D) Signup and view all the answers

Which of the following is NOT a lipid component of the cell membrane?

Glycolipids (B) Signup and view all the answers

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

Protein synthesis (C) Signup and view all the answers

Which of the following is NOT a type of transport across the plasma membrane?

Exocytosis (B) Signup and view all the answers

Which of the following is NOT a force at play across the cell membrane?

Gravity (B) Signup and view all the answers

Which of the following is NOT a component of the cytoskeleton?

Golgi apparatus (A) Signup and view all the answers

Which of the following lipid components has an impact on membrane fluidity based on its amount?

Cholesterol (C) Signup and view all the answers

What is the main function of the glycocalyx?

Binding to carbohydrates (D) Signup and view all the answers

Which of the following is true about the formation of micelles and bilayers?

Bilayers are more favorable than micelles (D) Signup and view all the answers

What is the main function of membrane proteins?

Transport & General Homeostasis (A) Signup and view all the answers

What is the main force at work across the cell membrane during diffusion?

Gibbs' free energy (B) Signup and view all the answers

Which of the following is true about extracellular signals and cell membrane receptors?

Extracellular signals are propagated into the cytosol through high-affinity protein receptors on the cell membrane. (C) Signup and view all the answers

What is the role of membrane proteins in the cell?

All of the above (D) Signup and view all the answers

What is the function of tight junctions?

Separate cells into apical and basal compartments (C) Signup and view all the answers

What are the three domains of most cell membrane receptors?

Hydrophobic, extracellular, intracellular (A) Signup and view all the answers

What is the role of membrane proteins that link the cell to extracellular structures?

Junctions (B) Signup and view all the answers

Which protein monomers form dimers to create microtubules?

Tubulin (C) Signup and view all the answers

What happens to the dimer when GTP is cleaved in tubulin?

It falls off the microtubule (D) Signup and view all the answers

What is the function of the microtubule organizing centre (MTOC) in cellular organization?

Determines cell polarity (D) Signup and view all the answers

Which proteins can move along microtubules and cause the 'whipping' movements of cilia and flagella?

Dyneins and kinesins (C) Signup and view all the answers

What is the primary function of intermediate filaments?

Cell stability (D) Signup and view all the answers