Encapsulated strains of Streptococcus pneumoniae are particularly pathogenic, because they
A) produce exotoxin A.
B) produce exotoxin B.
C) are potentially very invasive.
D) produce M protein surface antigens.
Answer: C
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A very narrow pedigree, such as that for Egypt's Ptolemy dynasty, reflects
A) families with many adopted children. B) a very mild phenotype. C) many uncles marrying their nephews. D) families with many relatives having children with blood relatives
One secondary spermatocyte ultimately produces ____ mature sperm
a. 1 b. 2 c. 3 d. 4 e. 8
Which statement is false?
a. Reflexes are the simplest of all nervous reactions. b. Reflexes are automatic responses. c. Motor neurons lead toward the brain or central nervous system. d. Reflex actions are stereotyped and repeatable. e. Sensory neurons conduct impulses from the receptor to the central nervous system
Tissue factor is a component of
a) intrinsic pathway of blood clotting b) extrinsic pathway c) common pathway d) complement pathway e) all of the above