30 Questions
Which component of lipid molecules is usually unbranched and may or may not be saturated?
Fatty acid tail
What type of molecule intercalates between phospholipids and impacts membrane fluidity?
Cholesterol
What is the function of the glycocalyx?
To protect the cell
Which type of membrane lipid has a slightly different shape that can decrease membrane fluidity?
Sphingolipids
Which membrane-bound component is responsible for creating and modifying proteins?
Smooth ER
Which junction helps in regulating movement across membranes and other epithelial structures?
Anchoring junction desmosome
What is the extracellular component in a desmosome?
Cadherins
Which junction commonly binds to the basement membrane and helps in anchoring epithelial cells?
Anchoring junction hemidesmosome
What do adherens junctions connect with instead of intermediate filaments?
Microfilaments
Which component of the cytoskeleton is responsible for cellular movement and organization of cellular components/organelles during mitosis and meiosis?
Microtubules
Which protein monomer forms microtubules?
Tubulin
What happens to the dimer after GTP is cleaved from tubulin?
It falls off the microtubule
What is the function of the microtubule organizing centre (MTOC)?
Cellular organization
What is the unique structure of centrioles?
A tubulin triplet structure
What are dyneins and kinesins?
Motor proteins
Which of the following is a lipid component of the cell membrane?
Phospholipids
Which of the following is NOT a function of the plasma membrane?
Protein synthesis
Which of the following describes the forces at play across the cell membrane?
Diffusion and osmosis
Which cellular structure helps maintain cellular integrity?
Na+/K+ ATPase
Which of the following is a component of the cytoskeleton?
Microfilaments
Which of the following is true about extracellular signals and cell membrane receptors?
Extracellular signals bind to high-affinity protein receptors on the cell membrane.
What determines whether a cell responds to a specific extracellular signal?
The expression of the receptor on the cell membrane.
Which of the following is NOT a function of membrane proteins?
Energy production
What do membrane proteins do in relation to the overall structure of the cell?
They link the cell membrane to the cytoskeleton.
What is the function of tight junctions?
To separate cells into apical and basal compartments.
Which of the following best describes osmosis?
The movement of water across a semi-permeable membrane
What happens when a solution with a higher concentration of solutes is separated from a solution with a lower concentration of solutes by a semi-permeable membrane?
The water moves from the higher concentration solution to the lower concentration solution
What is the main function of the Na+/K+ ATPase?
To establish a gradient of sodium and potassium across the membrane
Why does the Na+/K+ ATPase require energy from ATP?
To establish a gradient of sodium and potassium across the membrane
What is the difference between active transport and passive transport?
Active transport requires energy, while passive transport does not
Test your knowledge on plasma membranes and cell signaling. Learn about how cells respond to extracellular signals and the role of protein receptors in transmitting signals into the cell. Explore the different types of signals and their effects on cellular activity.
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