48 results found

Search Results for: polarity

Polarity

Definition noun (1) The presence of or having distinct and opposite poles (2) The condition of having contrasting properties... Read More

Egg polarity gene

Definition noun A maternal gene that encodes for products (mRNA or protein) whose spatial distribution in the egg determines... Read More

Centrosome

Centrosome Definition What is a centrosome? The centrosome is considered to be the main microtubule-organizing... Read More

Tight junction

What are tight junctions? Tight junctions are the intercellular barrier between two neighboring endothelial and epithelial... Read More

Permeability

Permeability Definition What is permeability? In earth science, its definition is this: "the ability of any material such... Read More

Depolarization

Depolarization is the removal of polarity by a process or action. It might also be used to describe how such activity leads... Read More

Maternal-effect gene

Definition noun, plural: maternal-effect genes (1) A gene from the mother's genome in which its phenotype in the zygote is... Read More

Maternal gene

Definition noun, plural: maternal genes (1) A gene from the mother's genome in which its expression on the phenotype of the... Read More

Polarization

Definition noun (general) The condition of polarity (biology) The process or act of producing positive and negative... Read More

Cytoskeleton

Definition noun plural: cytoskeletons cy·to·skel·e·ton (cell biology) The lattice or internal framework of a cell... Read More

Polar compound

Definition noun, plural: polar compounds A compound made up of molecules joined by assymetrical polar... Read More

Pair-rule gene

Definition noun A segmentation gene whose expression subdivides the embryo into a series of stripes, and sets the boundaries... Read More

Nonpolar compound

Definition noun, plural: nonpolar compounds A compound comprised of molecules linked through chemical bonds arranged in such... Read More

Phospholipid

What is a phospholipid? Phospholipids are a subgroup of lipids. Other major types of lipids are fatty acids, sphingolipids,... Read More

Microtubule

Microtubule Definition noun plural: microtubules mi·cro·tu·bule, mī'krō-tū'byūl A cytoplasmic tubule made up of... Read More

Water

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

Cohesion

Cohesion Definition What is cohesion? Cohesion, in science definition, refers to the state of cohering or sticking together... Read More

Polar

Definition adjective (general) Of, or having one or more poles (in a spherical body); being in opposite... Read More

Cell membrane

Cell Membrane Definition Just like any non-living body possesses a plastic or paper packaging material that keeps the... Read More

Hydrophilic

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

Spermatid

Spermatid Definition What are spermatids? Let us define spermatid and understand its role in reproduction. A spermatid... Read More

Intermediate filament

Definition noun plural: intermediate filaments A type of cytoskeleton characterized by having a diameter ranging from 8... Read More

Ionic bond

Definition noun plural: ionic bonds A type of chemical bond in which atoms, ions, or molecules are held together by... Read More

Simple squamous epithelium

Simple Squamous Epithelium Definition Simple squamous epithelium, also known as simple squamous epithelial tissue or... Read More

Oxygen

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

Hyperpolarization

Definition noun The process or act of making the membrane potential of a cell more negative Supplement Hyperpolarization is... Read More

Differentiation

Definition noun (developmental biology) The normal process by which a less specialized cell develops or matures to become... Read More

Micromolecule

Micromolecules Definition How to define micromolecule? Micromolecules are relatively small molecules that are combined... Read More

Gamete

Definition of Gamete What is a gamete? A gamete is the mature reproductive or sex cell that contains a haploid number of... Read More

Energy coupling

What is Energy Coupling? Work, whether it be physical or biological, requires energy to be expended. In biological... Read More

Zygotic-effect gene

Definition noun, plural: zygotic-effect genes (1) Any of the genes expressed in the early embryo. (2) Any of the genes... Read More

RNA virus

Definition noun A virus containing RNA as its genetic material. The RNA may be single stranded or double stranded. Examples... Read More

Polar molecule

Definition noun, plural: polar molecules A molecule with a net dipole as a result of the opposing charges (i.e. having... Read More

Afferent Nerve

Afferent Nerve Definition The word ‘aferent’ means "steering or conducting something towards a destination". The... 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

Cell matrix

Definition noun plural: cell matrices cell ma·trix, ˈmeɪtɹɪks An insoluble, dynamic gel in the cytoplasm, believed... Read More

Fushi tarazu

Definition noun (1) A pair-rule gene which, together with even-skipped, plays a crucial role in the activation of the... Read More

Neuron

Definition noun, plural: neurons An excitable cell that has specialized cell parts (such as soma, dendrites and axons),... Read More

Axon hillock

Axon Hillock Definition What is axon hillock? If you are familiar with the different parts of the neuron, the axon hillock... Read More

Cell differentiation

Cells are often described as the building blocks of life as they are the smallest unit used to build up organisms. Cells can... Read More