Prokaryotic ribosomes are dense structures, which solely contain RNA and proteins. The ribosomes in the prokaryotic cell are thoroughly distributed in the cell cytosol. There are two subunits of prokaryotic ribosomes (50-S and 30-S type). 50-S and 30-S are the large and small subunits of bacteria that colloquially constitute the 70-S type of ribosome. Here, …
Inclusions in prokaryotes include certain types of food reserve granules and some monolayered non-unit membrane-enclosed cytoplasmic inclusions. Cell inclusion bodies can define as the pigmented molecules, which resides within the cell. It does not function like membrane-bound organelles but performs a pivotal role to store reserve materials. Inclusion bodies occupy within the cytosol enveloped by …
ATP synthase is a transmembrane enzyme complex, which catalyses the generation of ATP through the condensation of ADP plus Pi. Its primary role is to produce high energy ATP molecule. ATP synthase brings out the formation of ATP at the time of light-reaction photosynthesis. Its working depends upon the proton gradient created in the thylakoid …
A floral formula is one of the ways to summarise all the flower characteristics, which makes the use of discrete letters, numbers and symbols. The letters used in the floral formula indicate the members of the perianth and other floral parts. Specific signs or symbols are also used to denote the properties like parentheses, aestivation, …
The difference between nucleus and nucleolus is mainly due to the following factors: Location: Nucleus is the core central organelle of the eukaryotic cell, while nucleolus resides interior to the nucleus. Size: The size of the nucleolus is very small compared with the size of the nucleus. Under the microscope, the nucleus appears as a …
Aestivation in plants can be defined as the arrangement of the petals and sepals, collectively called as perianth inside a floral bud before blooming. It is an important tool in the study of plant taxonomy, in which flowers of the different family show distinct aestivation. For instance, the sepals and petals of the Hibiscus flower …
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 …