Which of the following is the best definition of epitope?
A) specific regions on antigens that interact with T-cell receptors
B) specific regions on antigens that interact with MHC class molecules
C) specific regions on antigens that interact with haptens
D) specific regions on antigens that interact with antibodies
E) specific regions on antigens that interact with perforins
D
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Woese
A. was involved in determining rRNA sequences. B. proposed breaking prokaryotes into two groups. C. proposed breaking eukaryotes into Domains Archaea and Bacteria. D. was involved in refining the Gram stain for classification purposes. E. was involved in determining rRNA sequences AND proposed breaking prokaryotes into two groups.
Imagine that you have been miniaturized and are riding through the circulatory system using a red blood cell as a life raft. You are nearly deafened by the first heart sound, which is caused by __________.
Fill in the blank(s) with the appropriate word(s).
Feedback inhibition is a type of allosteric regulation in which a molecule binds to _______ and inhibits its _______.
a. a site on an enzyme distinct from the catalytic site; activity b. a site on an enzyme distinct from the catalytic site; synthesis c. the catalytic site on an enzyme; activity d. the mRNA for an enzyme; synthesis
Fossil evidence of Neanderthals have been found in the following areas except ______.
A. the Middle East? B. Europe C. Asia D. Siberia E. Australia