The presence of branched membrane lipids with ether linkages is a characteristic of ____
a. Archaea only
b. Bacteria only
c. both Archaea and Bacteria
d. of neither Archaea nor Bacteria
e. Archaea, Bacteria and Eukarya
ANSWER: a
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A. polymerases B. ribosomes C. enhancers D. chaperones E. transferases
Which of the following is released when an aminoacyl-tRNA synthetase charges a tRNA?
A. mRNA B. ATP C. AMP D. pyrophosphate E. AMP and pryophosphate
To infect a cell, HIV must
A. bind both CD4 and a cytokine co-receptor. B. bind both CD8 and a cytokine co-receptor. C. bind both CD8 and a class I MHC proteins. D. kill cytotoxic T cells and bind CD4.
Which of the following pathogens has an infectious dose so low that a single infectious particle (cell, cyst, endospore, virus) can cause disease?
A. Shigella B. Clostridium difficile C. Hepatitis A virus D. Giardia E. Norovirus