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What is the difference between integral and transmembrane proteins in terms of their structure and function?
Integral proteins are embedded within the lipid bilayer of the cell membrane, while transmembrane proteins span across the entire membrane. Integral proteins are involved in cell signaling and transport of molecules, while transmembrane proteins play a role in cell communication and maintaining cell structure.
What causes transmembrane channels in target cells?
Transmembrane channels in target cells are typically formed by specialized proteins that span the cell membrane. These proteins create a passageway for specific ions or molecules to move across the membrane, allowing for communication and transport between the cell's interior and exterior environments. The opening and closing of these channels can be regulated by various factors, including voltage changes, ligand binding, or mechanical force.
What is the electrical potential across the cell membrane of a nerve cell or muscle cell when the cell is not active?
The resting membrane potential of a nerve cell or muscle cell is typically around -70 millivolts. This electrical potential is maintained by the unequal distribution of ions across the cell membrane, with more negative ions inside the cell than outside. This resting potential is essential for the cell to respond to changes in its environment and generate electrical signals when needed.
Where do most local potentials happen?
Local potentials typically occur in the dendrites and cell body of a neuron. They involve small changes in membrane potential that do not reach the threshold for generating an action potential. These local changes in potential allow for signal integration and processing in the neuron.
What are proteins that stick into the cell membrane and pass all the way through called?
carbohydrate molecules ( they are attached to most of these proteins.)
Why is the transmembrane potential is important?
The transmembrane potential is important because it helps to maintain the resting state of a cell, allows for the propagation of action potentials, and contributes to various cellular processes such as ion transport, signaling, and cell communication. Changes in transmembrane potential can have significant effects on cellular function and overall physiology.
The transmembrane potential of a normal cell under homeostatic conditions?
The transmembrane potential of a normal cell under homeostatic conditions is typically around -70 millivolts, with the inside of the cell being negatively charged compared to the outside. This potential is maintained through the action of ion channels and pumps in the cell membrane that regulate the flow of ions across the membrane.
What is the difference between integral and transmembrane proteins in terms of their structure and function?
Integral proteins are embedded within the lipid bilayer of the cell membrane, while transmembrane proteins span across the entire membrane. Integral proteins are involved in cell signaling and transport of molecules, while transmembrane proteins play a role in cell communication and maintaining cell structure.
Are proteins involved in the sodium potassium pump?
Yes, proteins play a crucial role in the function of the sodium-potassium pump. The pump itself is a type of transmembrane protein that actively transports sodium and potassium ions across cell membranes, helping to maintain the cell's resting potential.
How is the K transmembrane flux when neurone hyperpolarizes?
The potassium ion channels in the cell open with hyperpolarization (injecting a negative current to take the cell potential more negative than Ek) The potassium ion channels in the cell open with hyperpolarization (injecting a negative current to take the cell potential more negative than Ek)
This type of macromolecules is a component of the cell membrane that helps move molecules in and out of the cell?
Transmembrane Proteins
What type of proteins don't go through the bilayer?
It important that some proteins extend all the way through the bilayer of a plasma membrane. This is to offer protection to the cell and also facilitate the transport of various substances in and out of the cell.
A gene having the potential to trigger cancerous changes in a cell?
oncogene
What device changes chemical energy into electric potential energyenergydiagram?
cell
What is the difference between an antibody and a B cell receptor?
Antibodies lack a transmembrane domain.
Cellular adhesion molecules are?
Cell adhesion molecules are groups of transmembrane proteins that mediate.
What is the stimulus that changes the resting membrane?
The stimuli that can change the resting membrane potential of a cell include changes in ion concentrations inside or outside the cell, neurotransmitter binding to receptors, and mechanical deformation of the cell membrane. These changes can lead to the opening or closing of ion channels, altering the flow of ions across the membrane and affecting the cell's resting membrane potential.
