Biochemical tests are useful to microbiology because
A) they can be used to identify microbes.
B) they can be used to detect metabolic end-products, intermediates, or particular enzymes.
C) they can be used to identify potential pathogens in clinical samples.
D) they can be used to identify microbes and to identify potential pathogens in clinical samples and they can be used to detect metabolic end-products, intermediates, or particular enzymes.
E) they can be used to identify microbes and to identify potential pathogens in clinical samples.
Answer: D
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Two F+ E. coli strains are co-cultured in the same flask. One is Strr Thr+ and the other is Genr Thr?. The culture is then plated on minimal media that is supplemented with gentamycin only (not threonine) and a few colonies grow. What sort of genetic exchange is most likely occurring?
A) transformation B) conjugation C) transduction D) electroporation
Under favorable conditions, plasmodial slime molds exist primarily as ____
a. a coordinated, multicellular mass b. individual amoeba-like cells c. individual flagellated cells
d. a single, multinucleated cellular mass e. spore-forming fruiting bodies
Bird respiration is extremely efficient because birds possess
a. a very long trachea. b. lungs. c. nares. d. air sacs. e. air bladders.
Penetrance specifically refers to the expression of lethal genes in heterozygotes
Indicate whether the statement is true or false