radula definition biology
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Radula The radula (plural radulae or radulas) is an anatomical structure that is used by molluscs for feeding, sometimes compared rather inaccurately to a tongue.It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus.The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves.Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs.n most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs.
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Stele (biology) Stele (biology) In a vascular plant, the stele is the central part of the root or stem containing the tissues derived from the procambium. These include vascular tissue, in some cases ground tissue (pith) and a pericycle, which, if present, defines the outermost boundary of the stele.
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- Definition. noun, plural: chlorophylls. The green pigment found in the chloroplasts of higher plants and in cells of photosynthetic microorganisms (e.g. photosynthetic bacteria), which is primarily involved in absorbing light energy for photosynthesis.Supplement.efinition. noun, plural: chlorophylls. The green pigment found in the chloroplasts of higher plants and in cells of photosynthetic microorganisms (e.g. photosynthetic bacteria), which is primarily involved in absorbing light energy for photosynthesis. Supplement.
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Dictionary Definition These two terms refer to front/belly (ventral) and back (dorsal) of an organism. The dorsal (Latin: dorsum, back) surface of an organism refers to the back. For example, the dorsal fin. The ventral (Latin: venter,  belly ) surface refers to the front, or lower side, of an organism. By connecting the outermost points the dorsoventral axis is formed. This is commonly abbreviated to DV axis.
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Nucleolus Nucleolus. Definition. noun, plural: nucleoli. The round granular structure within the nucleus of a cell, and composed of protein and RNA. Supplement. Nucleolus is involved with ribosomal RNA synthesis and formation of ribosomes in eukaryotes. Word origin: New Latin, from Latin, diminutive of nucleus, kernel.he round granular structure within the nucleus of a cell, and composed of protein and RNA. Supplement. Nucleolus is involved with ribosomal RNA synthesis and formation of ribosomes in eukaryotes. Word origin: New Latin, from Latin, diminutive of nucleus, kernel.
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Radula By Jennifer Kennedy. Definition: The radula is a special structure used by many molluscs to scrape food off rocks or create depressions in rocks that the mollusc uses for habitat.The radula has many rows of tiny teeth that are replaced as they wear down.One animal that has a radula is the common periwinkle, which uses its radula to scrape algae off rocks for food. Examples: The limpet is a marine invertebrate that uses its radula to create a home by boring a shallow hole into a rock.ne animal that has a radula is the common periwinkle, which uses its radula to scrape algae off rocks for food. Examples: The limpet is a marine invertebrate that uses its radula to create a home by boring a shallow hole into a rock.
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nucleolus n. pl. nu·cle·o·li (-lī′). A small body in the nucleus of a cell that contains protein and RNA and is the site for the synthesis of ribosomal RNA and for the formation of ribosomal subunits.
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- A Snail's Rainbow Radula. This abstract image is a close-up of the tiny teeth that cover the radula of a common whelk (Buccinum undatum). A radula is a tongue-like ribbon that helps the snail scrape or cut its food before it swallows it.
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plasmid plas·mid. n. A circular, double-stranded unit of DNA that replicates within a cell independently of the chromosomal DNA. Plasmids are most often found in bacteria and are used in recombinant DNA research to transfer genes between cells.las·mid. n. A circular, double-stranded unit of DNA that replicates within a cell independently of the chromosomal DNA. Plasmids are most often found in bacteria and are used in recombinant DNA research to transfer genes between cells.
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Nucleus Nucleus. Definition. noun, plural: nuclei. (general) The core or the central part around which other parts are grouped or gathered. (biology) The large, membrane-bounded organelle that contains the genetic material, in the form of multiple linear DNA molecules organized into structures called chromosomes.n biology, the major functions of nucleus are to maintain the integrity of DNA and to control cellular activities such as metabolism, growth, and reproduction by regulating gene expression. It has three main components: the nucleolus, the chromatin and the nuclear envelope.
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- thallus. noun thal·lus \ˈthal-əs\. plural thal·li \ˈthal-ˌī, -ˌē\ or thal·lus·es. : a plant or plantlike body (as of an alga, fungus, or moss) that lacks differentiation into distinct members (as stem, leaves, and roots) and does not grow from an apical point. a plant body that lacks differentiation into distinct parts (as stem, leaves, and roots), does not grow from an apical point, and is characteristic of organisms formerly classified as thallophytes. ADVERTISEMENT.
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What is a radula and what is it used for? A radula is a tongue-like organ located in the mouth of a mollusk. It has rows of backward curving teeth that grasp prey.
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- A pilus (Latin; plural: pili) is a hairlike structure on the surface of a cell, especially Gram-negative bacteria, a protein appendage required for bacterial conjugation. Pili connect the bacterium to another of its species and build a bridge between the cytoplasm of either cell.
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chromosome in Biology topic HB a part of every living cell that is shaped like a thread and contains the genes that control the size, shape etc that a plant or animal has. Definition of chromosome from the Longman Dictionary of Contemporary English within. the topic BIOLOGY.
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Blastula The blastula is an early stage of embryo nic development in animals. It is produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity.
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cell (Biology) biology the basic structural and functional unit of living organisms. It consists of a nucleus, containing the genetic material, surrounded by the cytoplasm in which are mitochondria, lysosomes, ribosomes, and other organelles. All cells are bounded by a cell membrane; plant cells have an outer cell wall in addition 4. (Biology) biology any small cavity or area, such as the cavity containing pollen in an anther
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Pili (1) (microbiology) Short, filamentous projections on a bacterial cell, used not for motility but for adhering to other bacterial cell (especially for mating) or to animal cells. (singular: pilus). (2) (botany) Philippine tree Canarium ovatum whose seeds are edible; source of Pili nut.
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Definitions &Translations Lac. Lac is the scarlet resinous secretion of a number of species of insects, namely some of the species of the genera Metatachardia, Laccifer, Tachordiella, Austrotacharidia, Afrotachardina, and Tachardina of the superfamily Coccoidea, of which the most commonly cultivated species is Kerria lacca.ac is the scarlet resinous secretion of a number of species of insects, namely some of the species of the genera Metatachardia, Laccifer, Tachordiella, Austrotacharidia, Afrotachardina, and Tachardina of the superfamily Coccoidea, of which the most commonly cultivated species is Kerria lacca.
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Epistatic gene Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane.
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BIOLOGICAL DIVERSITY: ANIMALS III 3. a head/foot region containing sensory organs and a muscular structure (foot) used for locomotion. The foot is a muscular structure used for locomotion, attachment to a substrate, food capture, or a combination of functions. A radula is an organ that bears many rows of teeth and is used for grazing on food.oelomates are animals that have internal body cavities, or coeloms. Humans are coelomates, we have an abdominal cavity (digestive organs, some of the excretory and reproductive organs) and a thoracic cavity (heart and lungs). Coelomates also form a variety of internal and external skeletons.
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nucleus Looking for Nucleus basalis? Find out information about Nucleus basalis. see cell cell, in biology, the unit of structure and function of which all plants and animals are composed. The cell is the smallest unit in the living... Explanation of Nucleus basalis
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- Phylum Mollusca shows variations on a common body plan, with a muscular foot, a mantle that secretes the shell, a visceral mass, and a radula, a feeding organ unique to the phylum. 1  They are bilateral protostome coelomates, and comprise the second-most diverse animal phylum (150,000 sp.).2  Three major classes are:hylum Mollusca shows variations on a common body plan, with a muscular foot, a mantle that secretes the shell, a visceral mass, and a radula, a feeding organ unique to the phylum. 1  They are bilateral protostome coelomates, and comprise the second-most diverse animal phylum (150,000 sp.). 2  Three major classes are:
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auricle 2. (Anatomy) Also called: pinna anatomy the external part of the ear. 3. (Biology) Also called: auricula biology an ear-shaped part or appendage, such as that occurring at the join of the leaf blade and the leaf sheath in some grasses. [C17: from Latin auricula the external ear, from auris ear]. (ˈɔr ɪ kəl).
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Nucleus Animal cell nucleus is a membrane bound organelle. It is surrounded by double membrane. The nucleus communicates with the surrounding cell cytoplasm through the nuclear pores. The DNA in the nucleus is responsible for the hereditary characteristics and protein synthesis.
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Definitions &Translations A vacuole (/ˈvækjuːoʊl/) is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal[1] and bacterial cells.[2] Vacuoles are essentially enclosed compartments which are filled with water containing inorganic and organic molecules including enzymes in solution, though in certain cases they may contain solids ...
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Glossary of Heartburn Terms Cannula: A hollow tube with a sharp, retractable inner core that can be inserted into a vein, an artery, or another body cavity.