Search results
Sep 11, 2024 · classification, in biology, the establishment of a hierarchical system of categories on the basis of presumed natural relationships among organisms. The science of biological classification is commonly called taxonomy ( q.v. ).
- The Editors of Encyclopaedia Britannica
2 days ago · A domain contains one or more kingdoms. Intermediate minor rankings are not shown. In biology, a kingdom is the second highest taxonomic rank, just below domain. Kingdoms are divided into smaller groups called phyla (singular phylum).
2 days ago · In molecular biology, a transcription factor (TF) (or sequence-specific DNA-binding factor) is a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to a specific DNA sequence. [1][2] The function of TFs is to regulate—turn on and off—genes in order to make sure that they are expressed in ...
Sep 9, 2024 · Definition: Multiple alleles refer to the presence of more than two alternative forms of a gene at a specific locus on the same DNA strand. Each individual inherits two alleles for a gene, but the gene itself may have several variants within a population.
Sep 10, 2024 · biomolecule, any of numerous substances that are produced by cells and living organisms. Biomolecules have a wide range of sizes and structures and perform a vast array of functions.
6 days ago · gene, unit of hereditary information that occupies a fixed position (locus) on a chromosome. Genes achieve their effects by directing the synthesis of proteins. In eukaryotes (such as animals, plants, and fungi), genes are contained within the cell nucleus.
Sep 16, 2024 · Definition: Domain and Range of a Function. For a function 𝑓 ∶ 𝑋 → 𝑌, the domain 𝑋 is the set of all possible values such that 𝑓 (𝑥) is valid. We can define it mathematically as 𝑋 ∶ = {𝑥 ∈ ℝ ∶ 𝑓 (𝑥) ∈ ℝ}. The range 𝑓 (𝑋) is the set of all values we can get from applying 𝑓 to elements of 𝑋. Mathematically it is defined by 𝑓 (𝑋) ∶ = {𝑓 (𝑥) ∶ 𝑥 ∈ 𝑋}.
