Humans belong to domain ________, which is distinguished by cells that have ________.
A) Prokarya; organelles
B) Archaea; ancient organelles
C) Eukarya; organelles
D) Prokarya; proteins
C) Eukarya; organelles
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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.
The phrase "Study nature, not books" is attributed to:
a. Louis Agassiz. b. Alexander Agassiz. c. Charles Darwin. d. Charles Wyville Thomson. e. Aristotle.
Archibald Garrod was the first to advance the idea that there is a direct link between ____________________ and
__________________ Fill in the blank(s) with the appropriate word(s).
The part of a mitochondrion that is analogous to the stroma of a chloroplast is the
A) outer membrane. B) grana. C) thylakoids. D) inner membrane. E) matrix.