Which term applies to the type of graft rejection that begins within a few weeks or months after transplantation of an organ and is due to CD8 reactive T cells?
A) acute rejection
B) hyperacute rejection
C) chronic rejection
D) accelerated rejection
Ans: C) chronic rejection
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A major organism used in the biocontrol of a variety of types of insects is ________.
A. Clostridium botulinum B. Bacillus subtilis C. Bacillus thuringiensis D. Bacillus cereus
A cell cluster with both algal and hyphal cells that is used for asexual reproduction in lichens is called a(n) ____
a. soredium b. arbuscule c. thallus d. sporangium e. haustorium
Why do species with large body sizes typically have lower population densities?
a. each large organism consumes more available resources b. there are not enough individuals to grow the population c. genetic diversity is low d. small organisms have more potential mates e. large organisms do not like living near one another
What is the main form of nitrogenous waste released by mammals to their environment?
a. amino acids b. urea c. ammonia d. nitrate