Which of the following pairs is mismatched?
A) Neisseria meningitidis — produces deadly endotoxins
B) Haemophilus influenzae — virulence due to capsule
C) Mycobacterium leprae — cultured in armadillos
D) Cryptococcus neoformans — acid-fast rod
E) Naegleria fowleri — causes amoebic encephalitis
D
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Which of the following is a characteristic of mollusks in the class Polyplacophora?
a. a broad, ventral foot b. two pairs of nephridia c. vivid coloration d. hinged valves
Altering the three-dimensional structure of an enzyme might change the amount of energy needed for a reaction. prevent the substrate from binding the enzyme's active site. change the type of substrate that binds the enzyme's active site. change the type of product produced in the reaction. allow the reaction to occur at a faster rate.
What will be an ideal response?
Ergot poisoning is caused by
a) Giardia intestinalis. b) Claviceps purpurea. c) Aspergillus flavus. d) Entamoeba histolytica.
A nucleotide is made of _______
a. sugar + phosphate b. sugar + phosphate + nitrogen base c. sugar + nitrogen base d. phosphate + nitrogen base