Lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacterial cells is an example of
A) An endotoxin
B) An exotoxin
C) A cytokine
D) An endonuclease
Ans: A) An endotoxin
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A pine seed consists of
a. the embryo. b. a female gametophyte. c. a seed coat. d. nutritive tissue. e. all of these.
What is the embryo implant success rate for in vitro fertilization?
a. 10% b. 20% c. 30% d. 50% e. 100%
Most cases of pharyngitis are caused by Group A ß-hemolytic streptococci
Indicate whether the statement is true or false
What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?
A) The muscles would be unable to contract. B) The person's muscles would contract uncontrollably. C) The sarcoplasmic reticulum would release sodium ions instead of calcium ions. D) The muscles would swell.