Biology

Cell Wall

Cell Wall Definition The cell wall is a protective layer outside the cell membrane that also provides support for the cell’s structure. It is the outermost layer of cells in plants, bacteria, fungi, and many algae that gives shape to the cell and protects it from infection. In plants, the c.....

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About Chloroplast

About Chloroplast Definition Chloroplast is an organelle unique to plant cells that contains chlorophyll, which is what makes plants green and is responsible for enabling photosynthesis to occur, so that plants can convert sunlight into chemical energy. It is a type of organelle known as a plasti.....

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About Microtubule

About Microtubule Definition Microtubules are cytoplasmic tubules that serve as the structural component of cytoskeleton, cilia, and eukaryotic flagella. They are found throughout the cytoplasm and it forms a component of the cytoskeleton. They undergo frequent assembly and disassembly within a c.....

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About Organelle

About Organelle Definition Living things are made of cells, or biological units also referred to as the building blocks of life. Some organisms consist of just one cell, while others are made of trillions of cells. Each one of these cells functions as a tiny factory, with individual parts that wo.....

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About Apicomplexa

About Apicomplexa Defintion Apicomplexa is a phylum comprised of organisms (also called apicomplexans) such as coccidian, gregarines, piroplasm, haemogregarines, and plasmodia. All apicomplexans are parasitic and lack contractile vacuoles and locomotor processes. Apicomplexans live within the bod.....

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Classification of Amoeba

Classification of Amoeba Introduction An amoeba (pronounced a-meeba) is a classification of protist that are amorphous in shape, meaning their body has no fixed structures. Amoebas do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms. Amoebo.....

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About Amoeba

About Amoeba Definition Amoeba is a large genus of naked rhizopod protozoans that have lobed and never anastomosing pseudopodia and are widely distributed in fresh and salt water and moist terrestrial environments. It refers to simple eukaryotic organisms that move in a characteristic crawling fa.....

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Flagellate (Protozoan)

Flagellate (Protozoan) Definition Flagellate is a protozoan that moves by means of a flagellum or flagella. Some flagellates, such as the euglena, can make food by photosynthesis like plants, while others, such as the trypanosomes, are parasitic and cause disease. The word flagellate also describ.....

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About Protozoa

About Protozoa Definition Protozoa are non-phototrophic, unicellular, eukaryotic microorganisms with no cell walls. All protozoa are eukaryotes and therefore possess a “true,” or membrane-bound, nucleus. They also are nonfilamentous, in contrast to organisms such as molds, a group of fungi, w.....

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Mitochondrion

Mitochondrion Definition Mitochondrion is regarded as the powerhouse of eukaryotic cells. That is because it is the organelle that supplies energy by generating adenosine triphosphate (ATP) through cellular respiration. Mitochondria are typically round to oval in shape and range in size from 0.5 .....

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Eukaryote

Eukaryote Definition Eukaryote is any member of the Eukarya, a domain of organisms having cells each with a distinct nucleus within which the genetic material is contained. Eukaryotes include protoctists, fungi, plants, and animals Compare prokaryote. The eukaryotic cell has a nuclear membrane th.....

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Endoplasmic Reticulum

Endoplasmic Reticulum Definition Endoplasmic Reticulum (or ER) is an interconnected network of membranes, which is used to make proteins, steroids, and lipids located near the nucleus. In biology endoplasmic reticulum is a continuous membrane system that forms a series of flattened sacs within th.....

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