274 results found

Search Results for: substances

Hydrophilic

Hydrophilic Definition What does a hydrophile (or hydrophilic molecule) mean? If a molecule is “water-loving”, it is... Read More

Homogenous

What is homogenous? What does homogenous mean? The word homogenous has been derived from two Greek words that are... Read More

Hydrophobic

Hydrophobic Definition The fear of mixing or reacting with water under a given set of reaction parameters is often referred... 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

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

Active transport

Active transport is a type of cellular transport in which substances (e.g. ions, glucose, and amino acids) are transported... 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

Mineral

Definition noun plural: minerals min·er·al, ˈmɪn.əɹ.əl Any of the various naturally-occurring abiogenic substances,... Read More

Element

Element Definition noun plural: elements el‧e‧ment, ˈel.ɪ.mənt (biochemistry) A substance that cannot be... Read More

Water

Water Definition (1) (biochemistry) A chemical substance, with chemical formula H2O, that is a clear, colorless, odorless,... Read More

Transport

In biology, transport refers to the act or the means by which a molecule or ion is moved across the cell membrane or via the... Read More

Diffusion

Diffusion Definition Diffusion is the net passive movement of molecules or particles from regions of higher to regions of... 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

Plant Tissues

Plants are composed of three major organ groups: roots, stems, and leaves. As we know from other areas of biology, these... 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

Secretion

Definition noun, plural: secretions (1) The physiological process of synthesizing and eventually releasing substances from... Read More

Substrate

Substrate Definition What is a "substrate"? The underlying substances or layers are termed as substrate. The definitions of... 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

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

Carrier protein

Carrier protein is a type of cell membrane protein involved in facilitated diffusion and active transport of substances out... Read More

Synergistic effect

Synergistic Effects Definition Synergistic effects (biology definition): the effects when chemical substances or biological... Read More

Hydrogen

Hydrogen is one of the chemical elements found in nature. A chemical element refers to the pure substance of one type of... Read More

Substance

Definition noun, plural:substances (1) The physical matter, material or that of which an organ or body consists. (2)... Read More

Cell wall

The cell is the structural, functional, and biological unit of all organisms. It is a membrane-bound structure containing... Read More

Oxidation

Oxidation Definition How do we define oxidation? There are several definitions of the oxidation process. Oxidation can be... Read More

Carbon

Carbon is one of the chemical elements found in nature. A chemical element refers to the pure substance of one type of atom.... Read More

Eubacteria

Eubacteria are prokaryotic microorganisms consisting of a single cell lacking a nucleus and containing DNA is a single... 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

Absorption

Definition noun, plural: absorptions The process of absorbing or assimilating substances into cells or across the tissues... Read More

Pinocytosis

Pinocytosis Definition What is pinocytosis?  Pinocytosis is the ingestion of extracellular fluids, i.e. the fluid... Read More

Oxygen

Oxygen Definition In biochemistry, oxygen is the colorless, odorless, gaseous element represented by the symbol "O", with... Read More

Human Biology – Food and Digestion

Food is what is required by humans to grow and survive, and provide a 'fuel' for the energy needed in our biological... Read More

BIOACCUMULATION

Bioaccumulation - a general term for the accumulation of substances, such as pesticides (ddt is an example), methylmercury,... Read More

-ine

-ine 1. (Science: chemistry, suffix) a suffix, indicating that those substances of whose names it is a part are basic, and... Read More

Decomposer

Decomposer Definition The organisms that carry out the process of decay or break down of the dead organism are known as... Read More

Circulation

Blood Blood is composed of a liquid, plasma, and blood cells such as erythrocytes (red blood cells,) leukocytes (white... Read More

Inorganic compound

Definition noun plural: inorganic compounds A chemical compound lacking both carbon-carbon (C-C) and carbon-hydrogen... Read More

Antigen

Antigen Definition What is an antigen? A simple definition is that an antigen refers to any substance that triggers an... Read More

Compound

Definition noun plural: compounds com·pound, ˈkɒmpaʊnd (general) A material made up of two or more parts or... Read More