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The nuclear envelope, also known as the nuclear membrane, [ 1][ a] is made up of two lipid bilayer membranes that in eukaryotic cells surround the nucleus, which encloses the genetic material . The nuclear envelope consists of two lipid bilayer membranes: an inner nuclear membrane and an outer nuclear membrane. [ 4]
Jeroboam was the son of Nebat, an Ephraimite of Zereda. His mother, [ a] named Zeruah (צרוע "leprous") was a widow. [ 3] He had at least two sons, Abijah [ 4] and Nadab; Nadab succeeded Jeroboam on the throne. King Solomon made the young Jeroboam a superintendent over his tribesmen in the building of the fortress Millo in Jerusalem and of ...
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
An insect 's respiratory system is the system with which it introduces respiratory gases to its interior and performs gas exchange . Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system ...
Active transport. In cellular biology, active is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration —against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active ...
Transduction is the process by which foreign DNA is introduced into a cell by a virus or viral vector. [ 1] An example is the viral transfer of DNA from one bacterium to another and hence an example of horizontal gene transfer. [ 2] Transduction does not require physical contact between the cell donating the DNA and the cell receiving the DNA ...
Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. [1] [2] All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. [3] Cell biology is the study of the structural and functional ...
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