Complement can be activated by all of the following except __________.
A) contact with a pathogen
B) mannose-binding lectins
C) opsonization
D) antigen-antibody binding
E) presence of host tissue
Answer: E) presence of host tissue
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Steroid hormones are large communication molecules that are modified cholesterol molecules. How do you think they enter a cell?
A) Their size probably allows them to diffuse through the plasma membrane. B) Their lipid nature probably allows them to diffuse through the plasma membrane. C) Their protein structure probably allows them to diffuse through the plasma membrane. D) They must require a protein transporter, because the plasma membrane is completely impermeable to molecules.
The type of cooperation between two species of a community that is based on satisfying the needs of both species is called
A. commensalism. B. mutualism. C. parasitism. D. predation.
A collection of related hypotheses that have been shown to be true after extensive testing can be collectively called a ________.
Fill in the blank(s) with the appropriate word(s).
Actinoplanetes that dwell in the soil play an important role in plant and animal decomposition.
Answer the following statement true (T) or false (F)