The floral diagram is a diagrammatical description of the properties like arrangement, position, structure, aestivation, connotation and adnation of the floral components. It was first introduced in the 19th century by the scientist named August Wilhelm Eichler. A floral diagram illustrates the different floral components by the characteristic symbols. It has a circular outline. There …
The nuclear pore complex encases the nuclear pore, which facilitates the translocation of macromolecules within the cell. A nuclear envelope possesses two concentric outer and inner layers fused with the NPCs. Both the phospholipid nuclear membranes are isolated by the perinuclear space in between. The nuclear membrane works as a selective barrier protecting inner nuclear …
The solenoid model illustrates the packaging or folding of DNA within the eukaryotic cell nucleus. It was first introduced by the scientist’s John Finch and Aaron Klug in the year 1976. In eukaryotes, the DNA is organized compactly due to the association of bead-like histone octamer and linker histones. Oppositely, the DNA content in prokaryotes …
A plant cell nucleus is a specialized structure, which stores genetic information and monitors cellular activities. Plants are monokaryotic cells, which possess an individual nucleus. A well-developed nucleus is only found in the advanced or multicellular organisms, those having division of labour. Nucleus presence is a prominent feature in plant cells, as it plays a …
The difference between induction and repression of operon is mainly characterized by the factors like regulation and the fundamental role of both systems. The operon system in prokaryotes regulates the expression of enzymes necessary to turn on or off the metabolic pathway. The regulatory gene of the inducible operon forms an active repressor protein whose …
The life cycle of Achyla species involves asexual or sexual modes of reproduction. The genus Achyla includes approximately 47 species and belongs to the group of oomycetes or water mould. Few species of Achyla are phytopathogens like Achlya conspicua and Achlya klebsiana. Most of the Achyla species are aquatic, while a few grow on damp …
Tryptophan operon is found within the genome of E.coli, which carries a set of genes constructing an essential amino acid, tryptophan. Sometimes, it is also termed as trp operon. Unlike lactose or lac operon, trp operon is a repressible system discussed in this article. A scientist named Charles Yanofsky and his co-workers explicitly studied the …
Nutrient agar is a standard media used for growing and isolating a broad class of microorganisms. It is the most popular media generally available in all laboratories to enumerate different bacteria. The enumeration of different bacteria from different samples like soil, water, sewage, food etc., can be carried out by using such media by employing …
Late blight in the potato is a plant disease caused by the pathogenic fungus Phytophthora infestans. It is a potentially devastating disease that primarily affects potato crops but can also be seen in the members of the Solanaceae family, including tomatoes, petunias and hairy nightshades. Phytophthora infestans is a plant pathogen, which can severely affect the …
The difference between cofactor and coenzyme is mainly characterized based on chemical nature and function. Cofactors constitute a large group of helper molecules (inorganic or organic). Conversely, cofactors are small organic molecules. Coenzymes significantly act as carrier materials to convert the inactive protein (the apoenzyme) into the active form (holoenzyme). In contrast, cofactors serve as …