bio12_sm_02_2
... chemicals used in cellular communication. Attachment and recognition proteins act as attachment points for structural elements such as the cytoskeleton or as recognition sites for foreign substances such as microbes. 10. They both detect molecules and perform an action in response. They both recogni ...
... chemicals used in cellular communication. Attachment and recognition proteins act as attachment points for structural elements such as the cytoskeleton or as recognition sites for foreign substances such as microbes. 10. They both detect molecules and perform an action in response. They both recogni ...
A13-Cell Membrane and Transport
... • Channel proteins are embedded in the cell membrane & have a pore for materials to cross • Carrier proteins can change shape to move material from one side of the membrane to the other ...
... • Channel proteins are embedded in the cell membrane & have a pore for materials to cross • Carrier proteins can change shape to move material from one side of the membrane to the other ...
HOMEOSTASIS AND CELL TRANSPORT Read the passage below
... SHORT ANSWER Answer the questions in the space provided. 29. Why is the sodium-potassium transport mechanism called a “pump”? __________ ...
... SHORT ANSWER Answer the questions in the space provided. 29. Why is the sodium-potassium transport mechanism called a “pump”? __________ ...
Membranous Structures of the Cell The Cell Membrane
... dissolved solutes, and particulate material from the extracellular medium are trapped inside the vesicle and internalized by the cell , three main types of endocytosis can be distinguished :1- Phagocytosis – is the ingestion of large particles or microorganisms, usually occurring only in specialized ...
... dissolved solutes, and particulate material from the extracellular medium are trapped inside the vesicle and internalized by the cell , three main types of endocytosis can be distinguished :1- Phagocytosis – is the ingestion of large particles or microorganisms, usually occurring only in specialized ...
Cell membrane wksht
... 2. Name the five types of proteins found in the plasma membrane and provide their function. (5 marks) ...
... 2. Name the five types of proteins found in the plasma membrane and provide their function. (5 marks) ...
cms/lib/NY01001456/Centricity/Domain/535/Cell transp Silent tea
... the movement of a substance down its concentration, from a region where it is more concentrated to a region where it is less concentrated. 33. What is a concentration gradient? a region along which the concentration of a substance increases or decreases. 34. What is passive transport? the diffusion ...
... the movement of a substance down its concentration, from a region where it is more concentrated to a region where it is less concentrated. 33. What is a concentration gradient? a region along which the concentration of a substance increases or decreases. 34. What is passive transport? the diffusion ...
Mark scheme - Biology for Life
... tight junctions act as barriers / keep digestive fluids in intestine separate from tissue fluid / maintain concentration gradients / ensure one way flow of absorbed materials; large numbers of mitochondria provide ATP / energy for active uptake / transport / processes; large amount of rER / sER / Go ...
... tight junctions act as barriers / keep digestive fluids in intestine separate from tissue fluid / maintain concentration gradients / ensure one way flow of absorbed materials; large numbers of mitochondria provide ATP / energy for active uptake / transport / processes; large amount of rER / sER / Go ...
4-6_SynTransRecycofNeurotrans_KotekZs
... neurotransmitters, synthesised locally within the axon terminal and large peptide molecules, synthesised in the cell body and transported through the axon to the synaptic terminal. Once they are synthesized,in both cases with the help of synthesising enzymes,the neurotransmitters are stored in vesic ...
... neurotransmitters, synthesised locally within the axon terminal and large peptide molecules, synthesised in the cell body and transported through the axon to the synaptic terminal. Once they are synthesized,in both cases with the help of synthesising enzymes,the neurotransmitters are stored in vesic ...
The Membrane: Overview
... The membrane is FLUID Lateral movement of phospholipids is rapid Fluidity of the membrane is important to its function Fluidity changes with temperature Fluidity depends on the composition of the membrane Ex: some fish live in extremely cold environments. How do they keep their membranes f ...
... The membrane is FLUID Lateral movement of phospholipids is rapid Fluidity of the membrane is important to its function Fluidity changes with temperature Fluidity depends on the composition of the membrane Ex: some fish live in extremely cold environments. How do they keep their membranes f ...
voltage-gated channels - The Parker Lab at UCI
... adaptation Frequency adaptation sets the interval between action potentials, and allows a neuron to fire at different rates depending on stimulus strength (frequency encoding – a squid axon can’t do this) ...
... adaptation Frequency adaptation sets the interval between action potentials, and allows a neuron to fire at different rates depending on stimulus strength (frequency encoding – a squid axon can’t do this) ...
The Plasma Membrane - Sinoe Medical Association
... Isotonic: Concentration of both sides are same Hypotonic: Low concentration of solute Hypertonic: High concentration of solute 5. What are the 2 types of active processes? Active Transport, Vesicular Transport ...
... Isotonic: Concentration of both sides are same Hypotonic: Low concentration of solute Hypertonic: High concentration of solute 5. What are the 2 types of active processes? Active Transport, Vesicular Transport ...
Notes
... transported with carrier proteins – transported using vesicle formation – requires energy. • Exocytosis - vesicles fuse with the plasma membrane for secretion. • Causes cell membrane to enlarge – ...
... transported with carrier proteins – transported using vesicle formation – requires energy. • Exocytosis - vesicles fuse with the plasma membrane for secretion. • Causes cell membrane to enlarge – ...
Membrane Protein Function & Cellular Transport
... • Diffuses across a membrane from the region of lower solute (such as an ion) concentration to the region of higher solute concentration ...
... • Diffuses across a membrane from the region of lower solute (such as an ion) concentration to the region of higher solute concentration ...
Transport across cellular membranes
... • Diffuses across a membrane from the region of lower solute (such as an ion) concentration to the region of higher solute concentration ...
... • Diffuses across a membrane from the region of lower solute (such as an ion) concentration to the region of higher solute concentration ...
Membranes
... Cholesterol can be found in the hydrophobic region (fatty acid tails) in animal cells. They determine membrane fluidity, which changes with temperature, allowing effective membrane function at a wider range of temperatures Plant cells, don’t have cholesterol, so they rely on saturated or unsaturate ...
... Cholesterol can be found in the hydrophobic region (fatty acid tails) in animal cells. They determine membrane fluidity, which changes with temperature, allowing effective membrane function at a wider range of temperatures Plant cells, don’t have cholesterol, so they rely on saturated or unsaturate ...
READ THIS!
... 19. Which substances in Model 2 appear to pass through the membrane with some difficulty? What could help them move across? Explain why. READ THIS! Diffusion is the process of molecules traveling through a membrane barrier from a location of high concentration to a location of low concentration. The ...
... 19. Which substances in Model 2 appear to pass through the membrane with some difficulty? What could help them move across? Explain why. READ THIS! Diffusion is the process of molecules traveling through a membrane barrier from a location of high concentration to a location of low concentration. The ...
Membrane potential
Membrane potential (also transmembrane potential or membrane voltage) is the difference in electric potential between the interior and the exterior of a biological cell. With respect to the exterior of the cell, typical values of membrane potential range from –40 mV to –80 mV.All animal cells are surrounded by a membrane composed of a lipid bilayer with proteins embedded in it. The membrane serves as both an insulator and a diffusion barrier to the movement of ions. Ion transporter/pump proteins actively push ions across the membrane and establish concentration gradients across the membrane, and ion channels allow ions to move across the membrane down those concentration gradients. Ion pumps and ion channels are electrically equivalent to a set of batteries and resistors inserted in the membrane, and therefore create a voltage difference between the two sides of the membrane.Virtually all eukaryotic cells (including cells from animals, plants, and fungi) maintain a non-zero transmembrane potential, usually with a negative voltage in the cell interior as compared to the cell exterior ranging from –40 mV to –80 mV. The membrane potential has two basic functions. First, it allows a cell to function as a battery, providing power to operate a variety of ""molecular devices"" embedded in the membrane. Second, in electrically excitable cells such as neurons and muscle cells, it is used for transmitting signals between different parts of a cell. Signals are generated by opening or closing of ion channels at one point in the membrane, producing a local change in the membrane potential. This change in the electric field can be quickly affected by either adjacent or more distant ion channels in the membrane. Those ion channels can then open or close as a result of the potential change, reproducing the signal.In non-excitable cells, and in excitable cells in their baseline states, the membrane potential is held at a relatively stable value, called the resting potential. For neurons, typical values of the resting potential range from –70 to –80 millivolts; that is, the interior of a cell has a negative baseline voltage of a bit less than one-tenth of a volt. The opening and closing of ion channels can induce a departure from the resting potential. This is called a depolarization if the interior voltage becomes less negative (say from –70 mV to –60 mV), or a hyperpolarization if the interior voltage becomes more negative (say from –70 mV to –80 mV). In excitable cells, a sufficiently large depolarization can evoke an action potential, in which the membrane potential changes rapidly and significantly for a short time (on the order of 1 to 100 milliseconds), often reversing its polarity. Action potentials are generated by the activation of certain voltage-gated ion channels.In neurons, the factors that influence the membrane potential are diverse. They include numerous types of ion channels, some of which are chemically gated and some of which are voltage-gated. Because voltage-gated ion channels are controlled by the membrane potential, while the membrane potential itself is influenced by these same ion channels, feedback loops that allow for complex temporal dynamics arise, including oscillations and regenerative events such as action potentials.