What can you conclude about the relationship between toxin secretion and culture density in S aureus quizlet?
– There is no relationship between culture density and the amount of secreted toxin for S. aureus. – Cultures grown at low density do not secrete significant amounts of toxin.
What are the three subclasses of membrane receptors?
Membrane receptors are mainly divided by structure and function into 3 classes: The ion channel linked receptor; The enzyme-linked receptor; and The G protein-coupled receptor.
Which type of membrane receptor forms a dimer upon binding a signaling molecule?
Receptor tyrosine kinases form dimers after binding signaling molecules.
What are the most common receptors for large hydrophilic signaling molecules?
A) Peripheral membrane proteins are the most common receptors for hydrophilic intercellular messenger molecules.
How do membrane phospholipids interact with water?
How do membrane phospholipids interact with water? The polar heads interact with water; the nonpolar tails do not. diffusion of water across a selectively permeable membrane. water goes from a region of lower solute concentration to higher solute concentration until solute concentration is equal.
Why does the Shmoo projection emerge on the same side of the cell that bound the mating factor?
Based on the model in the diagram, why does the shmoo projection emerge on the same side of the cell that bound the mating factor? The only formin molecules that get phosphorylated and thus activated are those near the G protein-coupled receptor that binds mating factor.
How do intracellular receptors differ from extracellular receptors?
Intracellular receptors are located in the cytoplasm of the cell and are activated by hydrophobic ligand molecules that can pass through the plasma membrane. Cell-surface receptors bind to an external ligand molecule and convert an extracellular signal into an intracellular signal.
How do intracellular receptors differ from membrane receptors?
How do intracellular receptors differ from membrane receptors? Intracellular receptors are located within a cell and bind to molecules that cross directly through the membrane. Membrane receptors bind to a signal molecule on the outside of a cell.
What are the differences and similarities between ion channel receptors and G protein linked receptors?
Ion channel -linked receptors bind a ligand and open a channel through the membrane that allows specific ions to pass through. G-protein-linked receptors bind a ligand and activate a membrane protein called a G-protein, which then interacts with either an ion channel or an enzyme in the membrane.
What are receptors in the plasma membrane?
Membrane receptors are specialized protein molecules attached to or integrated into the cell membrane. Through interaction with specific ligands (e.g., hormones and neurotransmitters), the receptors facilitate communication between the cell and the extracellular environment.
What are the differences and similarities between ion channel receptors and G-protein-linked receptors?
How do the properties of phospholipids contribute to membrane structure?
How do the properties of phospholipids contribute to their role in forming the structural framework of membranes? They have hydrophilic heads and hydrophobic tails. This forms the lipid bilayer and the basis of the plasma membrane.
What are the two types of receptors in the plasma membrane?
Two types of signal receptors embedded in the cell’s plasma membrane are G protein-coupled receptors and receptor tyrosine kinases. Classify each phrase by whether it applies to G protein-coupled receptors only, receptor tyrosine kinases only, both receptors, or neither receptor.
How do signaling molecules pass through the plasma membrane?
Unlike steroid hormones, signaling molecules that are large and/or hydrophilic cannot pass through the cell’s plasma membrane and therefore must bind extracellularly to receptor molecules in the plasma membrane. Two types of signal receptors embedded in the cell’s plasma membrane are G protein-coupled receptors…
How do gated ion channels work in the plasma membrane?
Figure 4 Gated ion channels form a pore through the plasma membrane that opens when the signaling molecule binds. The open pore then allows ions to flow into or out of the cell. G-protein-coupled receptors bind a ligand and activate a membrane protein called a G-protein.
What is the function of a cell surface receptor?
This type of receptor spans the plasma membrane and performs signal transduction, in which an extracellular signal is converted into an intercellular signal. Ligands that interact with cell-surface receptors do not have to enter the cell that they affect.