The sum total of all the microbes in a certain environment is termed the ________.
A. phylogeny
B. microbial niche
C. domain
D. microbiome
E. biofilm
Answer: D
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Porins are channels in the outer membranes of gram-positive Bacteria
Indicate whether the statement is true or false.
A taproot system lacks
(a) lateral roots. (b) a taproot. (c) both of the above. (d) none of the above.
The Nef protein helps HIV evade the adaptive immune system by____
a. destroying cytotoxic T cells b. destroying class I MHC proteins present on the surface of infected cells c. destroying class I MHC proteins in the cytoplasm d. binding to class I MHC proteins at the cell surface, thereby blocking their availability to cytotoxic T cells e. binding to class I MHC proteins and preventing their transport to the cell surface
Which of the following is NOT a reason why many species of turtles are now highly endangered?
a. Collection of young turtles for the pet trade. b. Hunting of turtles for their meat. c. Consumption of their eggs by humans. d. Consumption of their eggs by predators. e. Disease.