Cell Membrane Quiz

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Membrane basics test

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Faith Mahlafunya

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Cell Membrane Quiz


Cell Membrane QuizVersión en línea Membrane basics test por Faith Mahlafunya 1 What is the primary component of the cell membrane? a Protein matrix b Phospholipid bilayer c DNA double helix d Glycogen layer 2 What keeps membranes fluid at low temperatures? a Sodium ions b Actin filaments c Carbohydrates d Cholesterol 3 Which proteins span the membrane and have segments on both sides? a Glycoproteins only b Integral (transmembrane) proteins c Cytoskeletal proteins d Peripheral proteins 4 What term describes the membrane's ability to allow some substances to pass while blocking others? a Selective permeability b Osmotic equilibrium c Membrane rigidity d Non-selective diffusion 5 Which process moves water across a membrane? a Osmosis b Facilitated diffusion without water channels c Phagocytosis d Active transport 6 Which type of transport requires energy? a Active transport b Facilitated diffusion c Osmotic balance d Osmosis 7 Which molecule forms channels to facilitate ion movement across membranes? a Enzymes b Ion channels c Signal receptors d Glycolipids 8 What is the function of membrane cholesterol? a Catalyze reactions inside the nucleus b Maintain membrane fluidity and stability c Store genetic information d Direct protein synthesis 9 What term describes proteins on the membrane surface that identify cell types? a Cytoskeletal proteins b Glycoproteins c Cholesterols d Phospholipids 10 Which transport requires vesicle formation to move substances out of a cell? a Simple diffusion b Exocytosis c Osmosis d Facilitated diffusion 11 Which component primarily defines the barrier of the plasma membrane? a Phospholipid bilayer b Glycolipid bilayer c Glycoprotein lattice d Cholesterol monolayer 12 Which property best describes the fluid mosaic model? a Rigid, static arrangement b Cholesterol-free domains only c Uniform protein distribution d Lateral mobility of lipids and proteins 13 What is the role of cholesterol in animal membranes? a Anchors cytoskeleton b Catalyzes diffusion c Repels proteins d Modulates fluidity and permeability 14 Which type of protein spans the membrane? a Integral (transmembrane) proteins b Glycosylated lipids c Peripheral proteins d Lipid-anchored proteins 15 Which transport mechanism can move ions against their gradient? a Passive diffusion b Facilitated diffusion c Active transport via pumps d Osmosis 16 What drives canal-independent diffusion across the bilayer? a Lipid solubility and concentration gradient b Membrane protein channels c Vesicle fusion d ATP hydrolysis 17 Which statement about osmosis is true? a Osmosis requires ATP b Solutes move faster than water c Water moves against its gradient d Water moves toward higher solute concentration 18 Which component contributes to membrane asymmetry? a Symmetric protein packing b Different lipid compositions in each leaflet c Equal distribution of lipids d Uniform cholesterol content 19 Which molecules typically require transporters to cross membranes? a Small lipophilic molecules b Oxygen and CO2 passively diffusing c Ions and polar molecules d Nonpolar gases 20 Which term describes membrane protein mobility constraints by the cytoskeleton? a Hop diffusion or corralled diffusion b Active transport limitation c Simple diffusion d Bulk flow diffusion 21 What is the function of membrane rafts? a Organize signaling and trafficking domains b Anchor ribosomes c Increase transporter uniformity d Lyse the membrane 22 Which component contributes to the glycocalyx? a Phospholipids only b Glycoproteins and glycolipids c Cytoskeletal proteins d Cholesterol only 23 Which process inserts a protein into the membrane with a signal peptide? a Endocytosis b Glycosylation c Autophagy d Co-translational import via ER 24 What drives membrane curvature during vesicle formation? a Static lipid bilayer b ATP generation c Cytoskeleton degradation d Protein scaffolding and lipid composition 25 Which type of transport uses vesicles to move contents? a Ion channel transport b Facilitated diffusion c Vesicular transport d Passive diffusion 26 Which statement correctly describes channel selectivity? a Pores preferentially allow specific ions b Pores are non-specific c All ions pass equally d Proteins block all ions 27 What is the main energy source for active membrane transport? a Passive diffusion b Mitochondrial proton motive force c ATP hydrolysis usually d Concentration gradient alone 28 Which membranes show asymmetrical lipid distribution? a Plasma membranes and organelle membranes b Only plasma membranes c All membranes are symmetric d Only nuclear membranes 29 Which example illustrates secondary active transport? a Channel-mediated diffusion b ATP directly at pump site c Simple diffusion d Symport/antiport coupling with ion gradients 30 Which force drives passive transport? a Concentration gradient or electrochemical gradient b Proteolytic cleavage c ATP hydrolysis d Vesicle fusion energy 31 Which characteristic modulates membrane permeability? a Cholesterol content alone b Protein concentration only c Fatty acid chain length and saturation d Glycolipid amount only

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Cell Membrane QuizVersión en línea

por Faith Mahlafunya

What is the primary component of the cell membrane?

What keeps membranes fluid at low temperatures?

Which proteins span the membrane and have segments on both sides?

What term describes the membrane's ability to allow some substances to pass while blocking others?

Which process moves water across a membrane?

Which type of transport requires energy?

Which molecule forms channels to facilitate ion movement across membranes?

What is the function of membrane cholesterol?

What term describes proteins on the membrane surface that identify cell types?

Which transport requires vesicle formation to move substances out of a cell?

Which component primarily defines the barrier of the plasma membrane?

Which property best describes the fluid mosaic model?

What is the role of cholesterol in animal membranes?

Which type of protein spans the membrane?

Which transport mechanism can move ions against their gradient?

What drives canal-independent diffusion across the bilayer?

Which statement about osmosis is true?

Which component contributes to membrane asymmetry?

Which molecules typically require transporters to cross membranes?

Which term describes membrane protein mobility constraints by the cytoskeleton?

What is the function of membrane rafts?

Which component contributes to the glycocalyx?

Which process inserts a protein into the membrane with a signal peptide?

What drives membrane curvature during vesicle formation?

Which type of transport uses vesicles to move contents?

Which statement correctly describes channel selectivity?

What is the main energy source for active membrane transport?

Which membranes show asymmetrical lipid distribution?

Which example illustrates secondary active transport?

Which force drives passive transport?

Which characteristic modulates membrane permeability?