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What creatures fossilized leg bone did john horner discover red blood cells in in 1993?
John Horner discovered red blood cells in a Tyrannosaurus rex fossilized leg bone in 1993. This discovery provided evidence that some soft tissues can be preserved in fossils and opened up new possibilities for studying ancient life.
What signals does a t cell require in order to divide?
T cells require signaling through the T cell receptor (TCR) upon recognition of a specific antigen presented by antigen-presenting cells, as well as co-stimulatory signals from molecules like CD28 on the T cell and CD80/86 on the antigen-presenting cell. These signals are necessary for T cell activation and proliferation.
What do T-cells check each cell for?
Most excellent question! The T cell checks cells to see if the antigens that are presented on MHC class I molecules are self or foreign. If it is self, then it is left alone. Otherwise it will decide that it needs to destroy.
Do helper t cells have a cell membrane?
Yes, helper T cells, like all other cells, have a cell membrane. The cell membrane is a semipermeable barrier that surrounds the cell and helps regulate the passage of molecules in and out of the cell.
What is a t-cell?
T cells or T lymphocytes belong to a group of White blood cells known as Lymphocytes, and play a central role in cell-meaditated immunity . They can be distinguished from other lymphocyte types, suach as B cells and natural killer cells (NK cells) by the presence of a special receptor on their cell surface called T cell receptors (TCR). The abbreviation T, in T cell, stands for thymus, since this is the principal organ responsible for the T cell's maturation. Several different subsets of T cells have been discovered, each with a distinct function.
What is the longer name for T Rex?
T. rex is short for Tyrannosaurus rex.
Who is cooler Mosasaur or T-rex?
T-Rex
Who is stonger T-Rex or Spinosaurus?
T-Rex
Who will be the king a T-Rex or a Spinosaurus?
T-Rex
What is the scienctific name for the T-Rex?
Oddly enough, the name T-rex is its own scientific name. It's the abbreviation of the binomial name Tyrannosaurus rex and translates to "Tyrant lizard king" from latin.Interesting fact: as it is the abbreviation of a scientific name, it should be written as "T. rex", not "T-Rex" or "T Rex."
What abbreviation do scientists use when referring to Tyrannosaurus rex?
T. rex
How do you spell t-rex?
The slang term is T-Rex but the species name is Tyrannosaurus rex.
What abbreviation do scientist sometimes use when referring to tyrannosaurus rex?
T-Rex or T-rex
Who is stronger T Rex or Carcharadontosaurus?
A T-Rex of coures, because a T-Rex is bigger than a Allosaurus alot, and have a more powerful bite
What is t-rex stort for?
T-Rex is short for Tyrannosaurus rex ("Tyrant king of the lizards").
Was tyrannosaurus rex a scavenger?
No, the T-Rex was not a scavenger. the T-Rex killed its prey to get food.
How can t-rex see?
A T-Rex can see because it has eyes
