Answer:
B The host cell receptor is CD4 which the viral spike protein GP120 will bind to.
Explanation:
In HIV binding and entry, the HIV protein envelope, glycoprotein GP120 binds to the host primary cellular receptor CD4 to fuse to the host cell membrane and then initiate infection.
The virus presents itself as viral membrane spikes (molecular mimics of host molecules), these spikes consist of three molecules of gp120 which are linked together and anchored by gp41 protein to the membrane. The gp120 then binds to CD4 receptor of the host cell to facilitate viral entry int the host cell and further illicit other responses that lead to infection and dominance.
Answer:
Ground substance:
Ground substance may be defined as the component of extracellular matrix that made up of proteoglycans. The main function of ground substance is to resist the compressive forces.
Collagen fiber:
Collagen fiber may be defined as a type of protein fiber that provides strength to the organism. Collagen fibers are present within the matrix of the cell.
Elastic fiber:
Elastic fiber are presnt in bundles in the extracellular matrix. The amorphous elastin is present in the elastic fiber. This fiber provide elasticity to the cells.
Reticular fiber:
Reticular fiber composed of the type III collagen. The reticular fiber acts as the supportive mesh of the liver and bone marrow. Reticular fiber was discovered by M. Siegfried.
Real contractions start at the top of the uterus and, in a coordinated fashion, move through the middle of the uterus to the lower segment. Braxton Hicks contractions feel like a tightening of the abdomen and tend to be focused in one area.
I think the question is not full , it must be more than you put in the image because it’s not showing any type of medicines.
“Isostasy itself is based on the opposing influences of two main forces: buoyancy and gravity. For the earth, it is the reason that the relatively rigid lithospheric plates float at certain levels in the underlying ductile asthenosphere.”
