Search Results for: active transport
Active transport
Active transport is a type of cellular transport in which substances (e.g. ions, glucose, and amino acids) are transported... Read More
Carrier protein
Carrier protein is a type of cell membrane protein involved in facilitated diffusion and active transport of substances out... Read More
Facilitated diffusion
Facilitated diffusion is the transport of substances across a biological membrane from an area of higher concentration to an... Read More
Passive transport
Passive transport is a type of cellular transport in which substances such as ions and molecules move down their respective... Read More
Concentration gradient
Concentration gradient definition Concentration gradient refers to the gradual change in the concentration of solutes in a... Read More
Movement of Molecules Across Cell Membranes
Diffusion Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower... Read More
Simple diffusion
Simple Diffusion Definition What is simple diffusion? In biology, simple diffusion is a form of diffusion that does not... Read More
Plasma membrane
Do all cells have a plasma (or cell) membrane? Yes, all cells have a biological membrane that separates the protoplasm from... Read More
Cell membrane
Definition noun plural: cell membranes ˈmembɹeɪn The cell’s outer membrane made up of a two layers of phospholipids... Read More
Group translocation
Group Translocation Definition Just like your “home” is a private place where you and your comfort are maintained due... Read More
Chemiosmosis
Chemiosmosis Definition What is chemiosmosis? In biology, chemiosmosis refers to the process of moving ions (e.g. protons)... Read More
Water in Plants
The movement of molecules, specifically water and any solutes, is vital to understand in light of plant processes. This will... Read More
Biological Cell Introduction
It only takes one biological cell to create an organism. In fact, there are countless species of single-celled organisms,... Read More
Cell Biology
It only takes one biological cell to create an organism. In fact, there are countless species of single celled organisms,... Read More
Protein Activity and Cellular Metabolism
Protein Binding Sites The ability of various molecules and ions to bind to specific sites on the protein surface forms the... Read More
Polysaccharide
Reviewed by: Todd Smith, PhD Polysaccharide Definition noun plural: polysaccharides pol·y·sac·cha·ride,... Read More
Digestion and Absorption of Food
The gastrointestinal (GI) system includes the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine,... Read More
Cotransport
Cotransport (Science: cell biology, physiology) The linked, simultaneous transport one substance across a membrane, coupled... Read More
Pinocytosis
Pinocytosis Definition What is pinocytosis? Pinocytosis is the ingestion of extracellular fluids, i.e. the fluid... Read More
Nuclear envelope
Definition noun plural: nuclear envelopes nu·cle·ar en·ve·lope, ˈn(j)ukliɚ ˈɛn.və.ləʊp The two layered membrane... Read More
Transportase
transportase --> transport protein (Science: protein) A class of transmembrane protein that allows substances to cross... Read More
Anaerobic respiration
Anaerobic Respiration Definition What is anaerobic respiration? Anaerobic (cellular) respiration is a respiratory process... Read More
Sodium-potassium pump
Definition noun A transmembrane ATPase enzyme located in the plasma membrane of animal cells, and functions by pumping... Read More
Kidneys and Regulation of Water and Inorganic Ions
Renal Functions Kidneys remove/add substances from/to the plasma. Regulate water concentration, inorganic ion... Read More
Plasmodesmata
Plasmodesmata (singular, plasmodesma) microscopic channels of plants facilitating transport and communication between... Read More
Permeability
Permeability Definition What is permeability? In earth science, its definition is this: "the ability of any material such... Read More
Respiration
Organization of the Respiratory System Each lung is composed of air sacs called alveoli - the sites of gas exchange with... Read More
Phosphorylation
Phosphorylation Definition We can define phosphorylation as a biochemical process in which a phosphate molecule is added to... Read More
Sarcoplasmic reticulum
Definition noun plural: sarcoplasmic reticula (cell biology) The special type of smooth endoplasmic reticulum found in... Read More