Bacterium binds receptors, clathrin vesicle forms, then lysosomes digest the cargo

Bacterium enters through a channel, then ribosomes digest it into usable monomers

Vesicles dock and fuse with membrane, releasing glycoprotein to extracellular fluid

A channel opens during stimulation, letting the glycoprotein flow out by diffusion

The glycoprotein dissolves in lipids and exits directly through the membrane core

Receptor-mediated endocytosis, which uses specific membrane proteins to selectively internalize large molecules into vesicles

Phagocytosis, which uses specific membrane proteins to selectively internalize large molecules through pseudopod extension

Pinocytosis, which uses nonspecific membrane folding to randomly internalize large molecules into vesicles for processing

Exocytosis, which uses specific membrane proteins to selectively release large molecules from vesicles into extracellular space

Proteins move through compartments 1→2→3→4, with vesicle fusion at the membrane releasing enzymes to the exterior

Proteins move through compartments 2→1→3→4, with vesicle fusion at the membrane releasing enzymes to the exterior

Proteins move through compartments 1→3→2→4, with vesicle fusion at the membrane releasing enzymes to the exterior

Proteins move through compartments 1→2→4→3, with vesicle fusion at the membrane releasing enzymes to the exterior

All three pathways use membrane-derived vesicles for transport, but only pathway C demonstrates selectivity for specific molecules

All three pathways use membrane-derived vesicles for transport, but only pathway A demonstrates selectivity for specific molecules

Only pathways A and C use membrane-derived vesicles, while pathway B transports molecules directly through membrane channels

All three pathways use membrane-derived vesicles for transport, but only pathway B demonstrates selectivity for specific molecules

The rate remains unchanged because the doubling and halving effects cancel each other in the multiplicative relationship

The rate increases fourfold because receptor concentration has a squared effect on the multiplicative relationship

The rate decreases by half because ligand concentration is the limiting factor in the multiplicative relationship

The rate increases twofold because receptor concentration changes have greater effects than ligand concentration changes

Vesicle fusion with the plasma membrane, which releases insulin through exocytosis without requiring the hormone to pass through the lipid bilayer

Calcium channel opening at the plasma membrane, which creates pores large enough for insulin molecules to diffuse through directly

Potassium channel closing at the plasma membrane, which traps insulin inside until membrane depolarization forces release through the channels

ATP production increase in the cytoplasm, which provides energy for active transport of insulin directly through membrane carrier proteins

A flowchart showing receptor binding, membrane invagination forming a coated pit, vesicle formation, and release of insulin into the cytoplasm

A flowchart showing receptor binding, conformational change opening a channel, and direct passage of insulin through the membrane protein

A flowchart showing insulin diffusing through the lipid bilayer, binding to an internal receptor, and triggering a cellular response

A flowchart showing receptor binding, ATP hydrolysis pumping insulin across the membrane, and release on the cytoplasmic side

$P = k \cdot r \cdot A$, showing phagocytosis rate increases proportionally when binding affinity, extension rate, and available membrane all increase

$P = k + r + A$, showing phagocytosis rate increases additively when binding affinity, extension rate, and available membrane all increase

$P = \frac{k \cdot r}{A}$, showing phagocytosis rate increases with binding affinity and extension rate but decreases as available membrane increases

$P = k \cdot r \cdot A^2$, showing phagocytosis rate increases exponentially with available membrane while remaining proportional to binding affinity and extension rate