solution is osmotic movement of water into the cells‚ due to the cell being a hypotonic solution. Meanwhile‚ the soap solution undergoes another mechanism of lysis. The detergent from this solution causes a disruption of the lipid matrix of the cell membrane‚ resulting in the lysis. 4. Due to the solutions being hypertonic compared to the cell‚ the solutions of 2% NaCl and 5% NaCl would result in crenated
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Chapter 4: Membrane Structure and Function Fluid Mosaic Model 1. Consistency of membrane is solid enough to form a boundary‚ but flexible and permeable like a fluid. 2. Proteins scattered throughout - Embedded or on the surface - Can move around laterally 3. Phospholipid from bilayer‚ make up most of membrane 4. Glycolipids have carbohydrate chains attached. 5. Hydrophilic heads point out/into the cell 6. Hydrophobic tails point out towards each other Proteins 1. Glycoproteins: have
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Biology I Cell Biology Review 1. What are the four basic parts that all cells must have? 2. Draw a simple rod-shaped prokaryote with these features: Cell membrane‚ cell wall‚ cytoplasm‚ DNA‚ one plasmid and ribosomes. Which feature is unique to bacteria? 3. How might you tell the difference a prokaryotic cell from a eukaryotic one? Which is the most primitive? Which is the most complex? 4. What organisms are classified as prokaryotes? 5. Know all the organelles we covered and their
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RESTING POTENTIAL Resting potential is the membrane potential when a neuron is not conducting any electrical impulse or signal. The resting potential is around -75 mV. During resting potential‚ the inside of the axon is negative GRADED POTENTIAL ACTION POTENTIAL Action potential is a fleeting reversal of the membrane potential‚ caused by changes in permeability of the plasma membrane of neuron to potassium and sodium ions causing an electrical impulse to be transmitted along the axon.
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will convey across the membrane of an egg”. Furthermore‚ the egg was placed into three differing solutions‚ maple syrup‚ tap dihydrogen monoxide‚ and brine‚ to illustrate that “depending upon the concentration of dihydrogen monoxide in an egg and that in its circumventing environment‚ dihydrogen monoxide may diffuse into or out of the egg”. In summation‚ to genuinely understand the lab and make a plausible prognostication one must first grasp the concepts of the cell membrane as a semi-permeable barrier
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Animal Physiology Friday January 13‚ 2012 What are Animals? Invertebrates No spinal column Vertebrates Spinal column Major Animal Phyla Porifera Cnidaria Platyhel-minths Mollusca Annileda Nematoda Arthro-poda Echino-dermata Chordata What is Animal Physiology? What is Physiology? “The study of how animals work” (function) Knut Schmidt-Nielsen (1915–2007) – came up with the whole scheme of animal physiology from cell to whole organism temperature
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amielinicos nerves and myelinic nerves this last one favors the transit of the impulse in a saltatory way by the Nodules that it presents. The mode and site of action of these drugs are performed and interfere (altering the resting state of the nerve membrane‚
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Overview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier‚ 8 nm thick‚ controls traffic into and out of the cell. Like all biological membranes‚ the plasma membrane is selectively permeable‚ allowing some substances to cross more easily than others. Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins The main macromolecules in membranes are lipids and proteins‚ but carbohydrates are also important. The
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Digestion a. The mouth: salivary alpha enzyme chew food‚ perceive taste‚ moisten food with saliva‚ lubricate food with mucus‚ release starch –digesting (amylase) enzymes‚ initiate swallowing reflex - Enzyme: alpha amylase with cooked starch as substrate – starch digestion enzyme an enzyme that catalyses the breakdown of starch into sugar - The Functions of Saliva - 1. Moistens and lubricates food‚ permitting swallowing 2. Holds taste producing substances in solution and bring them in
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diffusion; it describes the passage of a solvent from a weaker solution‚ where there is higher water potential‚ to that of a more concentrated solution that has a lower water potential through a partially permeable membrane in order to achieve the state of equilibrium. A partially permeable membrane acts as a barrier to some substances but allows others to penetrate through freely. Within any plant cell the cytoplasm and cell sap within the vacuoles
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