All viruses contain a nucleic acid genome and a protein capsid that covers the genome.
The capsid protein is the structure that allows a virus to recognize and attach to receptors on the host cell. Correct B This protein shell of a virus provides proteins that enable the virion to penetrate the host cell membrane and, in some cases to inject the infectious nucleic acid into the cell's cytoplasm.
A virus is an infectious agent of typically small size and simple composition. The virus is capable of infecting the living beings such as plants, animals and bacteria. They posses an outer envelop called as capsid protein. This protein encloses within it genetic material of the virus that is RNA. The primary function of the capsid protein is to detect the host cell and attach to the receptors.
The answer is envelope.
A virus is an infectious agent that can replicate only inside a host cell. When it is outside the cell, it consists of genetic material coated with protein capsid. Some viruses, such as Influenza virus and HIV virus, also have an envelope which covers capsid. The envelope is an outer lipid bilayer that is studded with proteins. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
differs based on type of virus
a. most via endocytosis, w/ an endosome enclosing the virus
b. some via viropexis: VAP-receptor binding causes conformational change of capsid leads to hydrophobic portions of capsid creating a core through host cell membrane
a. fusion w/ cytoplasmic membrane: viral envelope membrane fuses w/ cell membrane, leading to nucleocapsid release into cytoplasm
b. fusion w/ endosomal membrane: endocytosis of virus leads to fusing w/ endosome membrane and release of nucleocapsid into the cell
The capsid protein is the protein shell of the virus and the capsid encloses the genetic material of the virus.The capsid protein has three basic functions:
1. It protects the nucleic acid from digestion by host enzymes.
2. It has special sites on its surface which allow the virus to attach to its host cell.
3. It supplies the protein which the virus needs to penetrate the cell membrane of the host cell.
a. to encourage apoptosis
the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.