How do fibrinolysins enhance a pathogen's virulence?
A) They destroy the molecules that hold cells together.
B) They break down fibrin proteins that are involved in clot formation, allowing the cells to penetrate deep into damaged skin.
C) They destroy the fibers that are found at the base of superficial tissues, allowing for deeper penetration by the pathogen.
Ans: B) They break down fibrin proteins that are involved in clot formation, allowing the cells to penetrate deep into damaged skin.
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The immunoglobulin class that is the only one capable of crossing the placenta is ________.
A. IgA B. IgG C. IgM D. IgE E. IgD
Which effect of vaccination is essential for future response to viral infections?
What will be an ideal response?
About how many base pairs are there in the DNA of human cells?
A. 1 million B. 20 million C. 3 billion D. 10 billion E. 100 billion
Rodents and lagomorphs have evolved an efficient method of digesting cellulose that involves
A. production of vitamin K. B. a special structure called a rumen. C. coprophagy. D. an abundance of stomach microorganisms.