Under what abiotic conditions can monomers spontaneously form polymers?
A) in the presence of oxygen gas
B) when ribozymes are present to catalyze the reaction
C) when a collection of organic molecules with a cell membrane are isolated
D) when water evaporates from a hot surface
D
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Gram-negative broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
Creutzfeldt-Jalob disease is one of the diseases caused by infectious proteins called
____________________. Fill in the blank(s) with the appropriate word(s).
Steroid hormones usually act via receptors that
a. are coupled to G proteins that activate adenylyl cyclase. b. activate tyrosine kinases. c. bind to DNA. d. activate phospholipase C.
A release of hydrogen ions to a solution would MOST likely ____________.
A) buffer pH B) change salinity C) raise pH D) lower pH E) keep pH steady