Upon activation by stomach acidity, the secretions of the parietal cells _____
A) initiate the chemical digestion of protein in the stomach
B) initiate the mechanical digestion of lipids in the stomach
C) initiate the chemical digestion of lipids in the stomach
D) include pepsinogen
E) delay digestion until the food arrives in the small intestine
Answer: A
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Two populations that inhabit the same area but remain genetically distinct can best be called
A. sympatric species. B. allopatric species. C. subspecies (races). D. polymorphic. E. species.
Sortase is a protein enzyme of bacteria that ________.
A. functions by transporting flagellum proteins to their extracellular site of assembly B. plays a key role in directing proteins to the periplasm C. catalyzes covalent attachment of some surface proteins to peptidoglycan D. directs secretion of proteins across the outer membrane
Negative staining facilitates the visualization of bacterial capsules that are intensely stained by the procedure.
Answer the following statement true (T) or false (F)
How long does it take for a plastic grocery bag to degrade?
A. 1 year B. 1-2 weeks C. more than 50 years D. 10-20 years E. 1-2 months