Which of the following is (are) true concerning
antigen-presenting cells?
a. They may be macrophages.
b. They may be B cells.
c. They may be dendritic cells.
d. They have antigen bound to their MHC markers.
e. All of these are true.
Answer: e
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Some crenarchaeotes have growth optima above the boiling point of water (at atmospheric pressure)
Indicate whether the statement is true or false.
Which statement about agricultural diversity is true?
a. The loss of wild crop species hinders the development of new crop varieties. b. Wild crop seeds cannot be bred with existing varieties of crop seeds. c. Modern pesticides effectively kill pest species while protecting non-pest species. d. A single pest enemy species is more effective at pest control than multiple species.
Complement proteins are part of ________ immunity.
A. adaptive B. innate
The membranes of psychrophilic bacteria have relatively high levels of ________ fatty acids, which allow them to remain semifluid at cold temperatures.
A. unsaturated B. sterol C. saturated D. aromatic