Simple Diffusion As the name implies, a solute simply diffuses when the electrochemical potentials on the opposing sides of a permeable barrier are dissimilar. This is a type of passive transport. Diffusion in biology refers to the selective permeation of a biological membrane, as opposed to the “spreading out” of molecules from a greater concentration …
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Definition of Bilirubin Bilirubin is a chemical that is generated when red blood cells and other porphyrin-containing cells are broken down. Red blood cells include special molecules known as hemes (a form of porphyrin) that contain an iron atom. This configuration permits the red blood cell to transport oxygen. When blood cells degrade, heme is …
Pinocytosis Definition Pino, which means “to drink” and cytosis which means “related to the cell” are the two terms that make up the phrase ‘Pinocytosis’. This is an endocytosis which involves the passage of minute particles floating in extracellular fluid via cell membrane pores. It is a general method of internalizing fluid and dissolved nutrients …
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Peroxisomes Definition A range of metabolic processes including various elements of energy metabolism use oxidative enzymes found in peroxisomes, which are tiny, membrane-enclosed cellular organelles. These are regarded as a significant subset of microbodies that are present in both plant and animal cells. After having already been characterized, they were recognized as organelles by Belgian …
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Hydrogen Sulfide Test Definition The capacity of some microbes to break down molecules containing Sulphur (Sulphur) into hydrogen sulphide (H2S) during metabolism is frequently used as a laboratory test for microbiological confirmation. Methods for detecting H2S generation by bacteria are affected by the supply of Sulphur and the metal salts employed to indicate H2S creation. …
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Incubator Definition In microbiology, an incubator is an enclosed, insulated device that offers the ideal levels of humidity, temperature, and other environmental variables needed for the development of organisms. An incubator is a crucial piece of scientific equipment used for growing microorganisms in controlled environments. It is possible to grow both single-celled and multicellular creatures …
Arteries Vs Veins Overview The two primary types of blood vessels in the body through which blood flows are arteries and veins. The veins return deoxygenated blood from the tissue capillaries to the heart while the arteries transport oxygenated blood away from the heart. Arteries Vs Veins S.N. Character Arteries Veins 1. Definition Blood vessels …
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Endoplasmic Reticulum (ER) Definition The endoplasmic reticulum (ER) is a vast network of membrane-limited channels that is found in the cytoplasm of the majority of animal cells. The endoplasmic reticulum is so-called because, under a light microscope, it seems to be a “net in the cytoplasm.” Only eukaryotic cells include the endoplasmic reticulum. However, the …
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Plasmodesmata Definition Each tiny cytoplasmic channel, known as a plasmodesma, that connects a live cell to its next living cell in a higher plant is able to pass through the walls of the intervening cells. They function as cell wall tunnels that allow the cells in a tissue communicate with one another. Each plasmodesma connects …
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Flagella Definition The hair-like structure protruding from some plant and animal cells are known as a flagellum or flagella. These are crucial for a variety of physiological processes carried out by the cell. “Flagellum” refers to the long, slender form of the structure, which resembles a whip and is derived from the Latin word for …
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