The outer boundary of the cell is the
What will be an ideal response?
plasma membrane
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A scientist reports the isolation of a new blood-borne virus that completely shuts down presentation of viral epitopes on MHC molecules in the cells it infects
He produces an internet video describing it and how it will be indestructible by CD8+ cytotoxic T cells and will kill millions (if not billions) of people.The medical community quickly denounces the dire warning as irrevlevant, and the whole thing is quickly forgotten-why? A. CD8+ T cells are not the cells that are responsible for killing virally infected cells. The terrorist mad scientist is a misinformed idiot. B. While CD8+ T cells ARE important for eliminating a viral infection, they are not the ONLY things that are capable of doing so. Natural killer cells can kill virally infected cells that have shut down MHC antigen presentation, and interferons can assist in cleaning virally infected cells. C. A blood-borne virus would not be capable of rapidly infecting millions of people, due to its difficult mode of transmission. D. B cells would be primed right away to produce complement proteins to destroy the virus. This would prevent cells from being infected with it in the first place. His plot would be foiled. E. While CD8+ T cells ARE important for eliminating a viral infection, they are not the ONLY things that are capable of doing so. Natural killer cells can kill virally infected cells that have shut down MHC antigen presentation, and interferons can assist in cleaning virally infected cells AND a blood-borne virus would not be capable of rapidly infecting millions of people, due to its difficult mode of transmission.
cDNA is copied from
A) DNA. B) protein. C) mRNA. D) a pictogram.
A ________, a ________, and a ________ are the major parts of a nucleotide, whereas a ________ and a ________ are the major parts of a nucleoside
Fill in the blank with correct word.
Which hypothesis, based on the two laws of thermodynamics as applied to cells, would determine if something is a living cell or not?
A) If something uses energy to make itself more organized, then it is alive. B) If something is organized, then it is alive. C) If something moves, then it is alive. D) If something loses heat, then it is alive. E) If something uses energy to move, then it is alive.