In Jacob and Monad’s analysis of mutant E. coli strains in their study of the lac operon, the absence of the ?-
galactosidase enzyme, but presence of the lactose permease and galactosidase transacetylase enzymes, indicated that the
mutation occurred in the _____ of the lac operon.
a. regulatory region
b. lacZ gene
c. lacA gene
d. lacY gene
e. heterochromatin
b
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Restriction endonucleases were discovered by
A. Jackson, Symons, and Berg. B. Boyer and Cohen. C. Temin and Baltimore. D. Arber and Smith.
Which of the following samples would NOT be suitable for a metagenomics-based approach?
A. Water samples from different bodies of water with different temperatures, salinities, and acidities B. A soil sample from a farm where a new planting schedule has been implemented C. A water sample from an industrial site that has been contaminated with pollutants D. A fecal sample from a patient with irritable bowel syndrome E. A homogenous population of skin cancer cells collected from a patient biopsy
Which of the following is/are the most common cause of pharyngitis?
A) Escherichia coli B) Staphylococcus aureus C) Streptococcus pyogenes D) viruses
Which of the following organisms is the most common cause of urethritis?
A) Candida albicans B) Chlamydia trachomatis C) Neisseria gonorrhoeae D) Trichomonas vaginalis