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True or False 'A change in the primary sequence of a protein can affect allosteric regulation'?
True. A change in the primary sequence of a protein can alter its three-dimensional structure, which in turn can affect the binding of allosteric regulators and thus impact allosteric regulation.
What blocks enzyme activity by binding to allosteric site of an enzyme causing the enzyme's active site to change shape?
Allosteric inhibitors bind to a specific site on an enzyme (allosteric site) other than the active site, inducing a conformational change that decreases enzyme activity. This alteration prevents the substrate from binding to the active site, thus blocking the enzyme's ability to catalyze reactions.
How does a receptor in the membrane transmit a message to the cell?
Receptors detect a signal molecule and perform an action in response.
When a signal molecule such as a growth hormone binds to a receptor protein in the plasma membrane it stays on the outside of the cell. How might the inside of the cell know that the signal has bound?
When a signal molecule binds to a receptor protein on the cell membrane, it triggers a cascade of signaling events inside the cell through intracellular signaling molecules like second messengers. These second messengers relay the signal from the receptor at the cell membrane to the cell's interior, which initiates a response by activating various cellular processes. This signal transduction pathway enables the inside of the cell to detect and respond to the binding of the signal molecule at the membrane.
How does noncompetitive inhibition differ from allosteric inhibition in terms of their mechanisms of action on enzyme activity?
Noncompetitive inhibition and allosteric inhibition both affect enzyme activity, but through different mechanisms. Noncompetitive inhibition binds to a site on the enzyme that is not the active site, causing a change in the enzyme's shape and reducing its activity. Allosteric inhibition, on the other hand, binds to a different site on the enzyme called the allosteric site, which also causes a change in the enzyme's shape and reduces its activity.
How does a receptor in the cell membrane transmit a message to the cell?
The receptor induces changes in the metabolism and activity of a cell. In the process of signal transduction, ligand binding affects a cascading chemical change through the cell membrane.
What change does ACh cause in an ACh receptor?
Acetylcholine (ACh) binding to an acetylcholine receptor triggers a conformational change in the receptor protein, leading to the opening of an ion channel within the receptor. This allows specific ions, such as sodium or potassium, to flow across the cell membrane, resulting in changes in membrane potential and ultimately leading to cellular responses.
True or False 'A change in the primary sequence of a protein can affect allosteric regulation'?
True. A change in the primary sequence of a protein can alter its three-dimensional structure, which in turn can affect the binding of allosteric regulators and thus impact allosteric regulation.
What blocks enzyme activity by binding to allosteric site of an enzyme causing the enzyme's active site to change shape?
Allosteric inhibitors bind to a specific site on an enzyme (allosteric site) other than the active site, inducing a conformational change that decreases enzyme activity. This alteration prevents the substrate from binding to the active site, thus blocking the enzyme's ability to catalyze reactions.
What is a molecule that is generated when a specific substance attaches to a receptor on the outside of a cell membrane which produces a change in cellular function?
Second messengerSecond Messenger
A specific protein that recognizes certain molecules bringing them across the membrane?
The protein you are referring to is likely a transporter protein, which is responsible for facilitating the transport of specific molecules across the cell membrane. These transporter proteins bind to their target molecules on one side of the membrane and undergo a conformational change to transport the molecules to the other side. Examples include glucose transporters and ion channels.
How does a receptor in the membrane transmit a message to the cell?
Receptors detect a signal molecule and perform an action in response.
How allosteric enzymes differ non allosteric?
Allosteric enzymes have an additional regulatory site (allosteric site) distinct from the active site that can bind to specific molecules, affecting enzyme activity. Non-allosteric enzymes lack this additional regulatory site and their activity is primarily controlled by substrate binding to the active site. Allosteric enzymes show sigmoidal kinetics in response to substrate concentration due to cooperativity, while non-allosteric enzymes exhibit hyperbolic kinetics.
When a signal molecule such as a growth hormone binds to a receptor protein in the plasma membrane it stays on the outside of the cell. How might the inside of the cell know that the signal has bound?
When a signal molecule binds to a receptor protein on the cell membrane, it triggers a cascade of signaling events inside the cell through intracellular signaling molecules like second messengers. These second messengers relay the signal from the receptor at the cell membrane to the cell's interior, which initiates a response by activating various cellular processes. This signal transduction pathway enables the inside of the cell to detect and respond to the binding of the signal molecule at the membrane.
When a product binds to an allosteric enzyme to slow its reaction what does it do?
When a product binds to an allosteric enzyme to slow its reaction, it is acting as a negative allosteric regulator. This binding causes a conformational change in the enzyme, reducing its affinity for the substrate and slowing down the overall reaction rate.
What is the voltage change at the receptor site of a neuron?
When a neuron is activated, there is a change in the voltage across the cell membrane at the receptor site. This change is known as a postsynaptic potential and can be either depolarizing (making the neuron more likely to fire an action potential) or hyperpolarizing (making the neuron less likely to fire an action potential).
Receptor proteins can change the what of the cell membrane?
Receptor proteins can change the permeability and signaling characteristics of the cell membrane. When ligands bind to these receptors, they often trigger conformational changes that initiate intracellular signaling pathways, affecting various cellular responses. This interaction can lead to alterations in ion channel activity, activation of second messengers, or changes in gene expression, ultimately influencing the cell's behavior and communication with its environment.
