query: taxon_rank nanobacterium
supports: Ribose is a carbohydrate with the formula CHO; specifically, it is a pentose monosaccharide (simple sugar) with linear form H(C=O)(CHOH)H, which has all the hydroxyl groups on the same side in the Fischer projection. Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, identification and taxonomy. Modern biology is a vast and eclectic field, composed of many branches and subdisciplines. However, despite the broad scope of biology, there are certain general and unifying concepts within it that govern all study and research, consolidating it into single, coherent field. In general, biology recognizes the cell as the basic unit of life, genes as the basic unit of heredity, and evolution as the engine that propels the synthesis and creation of new species. It is also understood today that all the organisms survive by consuming and transforming energy and by regulating their internal environment to maintain a stable and vital condition known as homeostasis. Animals are multicellular, eukaryotic organisms of the kingdom Animalia (also called Metazoa). The animal kingdom emerged as a basal clade within Apoikozoa as a sister of the choanoflagellates. Sponges are the most basal clade of animals. Animals are motile, meaning they can move spontaneously and independently at some point in their lives. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs: they must ingest other organisms or their products for sustenance. In biology, an organism is any contiguous living system, such as an animal, plant, fungus, archaeon, or bacterium. All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells; when it has one cell it is known as a unicellular organism; and when it has more than one it is known as a multicellular organism. Most unicellular organisms are of microscopic scale and are thus loosely described as microorganisms. Humans are multicellular organisms composed of many trillions of cells grouped into specialized tissues and organs. Nanobacterium ( NAH - no - bak - TEER - ee - m , pl . nanobacteria NAH - no - bak - TEER - ee - uh ) is the unit or member name of a proposed class of living organisms , specifically cell - walled microorganisms with a size much smaller than the generally accepted lower limit for life ( about 200 nanometres for bacteria ) . Originally based on observed nano - scale structures in geological formations ( including one meteorite ) , the status of nanobacteria has been controversial , with some researchers suggesting they are a new class of living organism capable of incorporating radiolabeled uridine , and others attributing to them a simpler , abiotic nature . One skeptic dubbed them `` the cold fusion of microbiology '' , in reference to a notorious episode of supposed erroneous science . The term `` calcifying nanoparticles '' ( CNPs ) has also been used as a conservative name regarding their possible status as a life form . Research tends to agree that these structures exist , and appear to replicate in some way . However , the idea that they are living entities has now largely been discarded , and the particles are instead thought to be nonliving crystallizations of minerals and organic molecules . Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell. Historically, simple unicellular organisms have been referred to as monads, though this term is also used more specifically to describe organisms of the genus "Monas" and similar flagellate ameboids. The main groups of unicellular organisms are bacteria, archaea, protozoa, unicellular algae, and unicellular fungi. Unicellular organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms. Unicellular organisms are thought to be the oldest form of life, with early protocells possibly emerging 3.84 billion years ago. Uridine is a glycosylated pyrimidine-analog containing uracil attached to a ribose ring (or more specifically, a ribofuranose) via a -N-glycosidic bond. Uracil (U) is one of the four nucleobases in the nucleic acid of RNA that are represented by the letters A, G, C and U. The others are adenine (A), cytosine (C), and guanine (G). In RNA, uracil binds to adenine via two hydrogen bonds. In DNA, the uracil nucleobase is replaced by thymine. Uracil is a demethylated form of thymine. A fungus (plural: fungi or funguses) is any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms such as mushrooms and bracket fungi. These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants and animals. In chemistry, a glycosidic bond or glycosidic linkage is a type of covalent bond that joins a carbohydrate (sugar) molecule to another group, which may or may not be another carbohydrate.
candidates: form genus group kingdom species
answer: genus