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What is the definition of base in biology?
Definition. noun, plural: bases. (1) (molecular biology) The nucleobase of a nucleotide involved in base pairing, as of a DNA or RNA polymer. (2) (anatomy) The lowest or bottom part of a plant or animal organ closest to the point of attachment.
What is the exact definition of base?
Base, in chemistry, any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of indicators (e.g., turns red litmus paper blue), reacts with acids to form salts, and promotes certain chemical reactions (base catalysis).
What does base mean in Old English?
base (n.) “bottom of anything considered as its support, foundation, pedestal,” early 14c., from Old French bas “depth” (12c.), from Latin basis “foundation,” from Greek basis “a stepping, a step, that on which one steps or stands, pedestal,” from bainein “to go, walk, step,” from PIE root *gwa- “to go, come.”
What is the meaning of base of an object?
Definition: The bottom of a shape, solid or three dimensional object. The base is what the object ‘rests’ on. The base is the surface of the object that is stands on or it is the bottom line. Examples: The bottom of the triangular based prism is considered the base.
Is a base in biology?
In nucleic acid chemistry, one of the nitrogenous compounds, i.e. purines and pyrimidines, that are incorporated into nucleosides, nucleotides and nucleic acids. The most common bases are adenine, cytosine, guanine, thymine and uracil, abbreviated as A, C, G, T and U respectively.
What is a DNA base?
Molecules called nucleotides, on opposite strands of the DNA double helix, that form chemical bonds with one another. These chemical bonds act like rungs in a ladder and help hold the two strands of DNA together. There are four nucleotides, or bases, in DNA: adenine (A), cytosine (C), guanine (G), and thymine (T).
What is base and example?
Examples of bases are sodium hydroxide, calcium carbonate and potassium oxide. A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts. The soluble bases are called alkalis. Sodium hydroxide is an alkali.
Who is a base person?
base, low, vile mean deserving of contempt because of the absence of higher values. base stresses the ignoble and may suggest cruelty, treachery, greed, or grossness. base motives low may connote crafty cunning, vulgarity, or immorality and regularly implies an outraging of one’s sense of decency or propriety.
Why is it called a base?
The word “base” came into use in 1717 by French chemist Louis Lémery. Lémery used the word as a synonym for Paracelsus’ alchemical concept of a “matrix” in alchemy. Paracelsus proposed natural salts grew as a result of a universal acid mixing with a matrix.
What is an example of a base in biology?
Examples of bases are sodium hydroxide, calcium carbonate and potassium oxide. A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts.
What is pH stand for?
The abbreviation pH stands for potential hydrogen, and it tells us how much hydrogen is in liquids—and how active the hydrogen ion is.
What are 4 base pairs of DNA?
There are four nucleotides, or bases, in DNA: adenine (A), cytosine (C), guanine (G), and thymine (T). These bases form specific pairs (A with T, and G with C).
What does base word mean?
Base word is a form of a word to which affixes can be added to create new words. Base words and root words are two terms that are sometimes used as synonyms. However, root words are also defined as parts of the base word that come from another language.
What can be the bases for?
Basis is generally the amount of your capital investment in property for tax purposes. Use your basis to figure depreciation, amortization, depletion, casualty losses, and any gain or loss on the sale, exchange, or other disposition of the property. In most situations, the basis of an asset is its cost to you.
What does the term first base mean?
Definition of first base. 1 : the base that must be touched first by a base runner in baseball. 2 : the player position for defending the area around first base.
What does on base mean?
Definition of on base. : occupying one of the bases (first, second, or third) during a game There’s a runner on base.