What is the difference between a selection and a screen with regard to cloning genes into plasmids and

transforming them into host cells?



What will be an ideal response?


A selection is when an environment is artificially created to only allow host cells containing clones of
a certain type to survive. A screen is when all host cells survive, and then the researcher sorts through
the cells that these host cells contain to find the one(s) of interest.

Biology & Microbiology

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True or false: mutations always result in the death of the organism which acquires them

A. true B. false

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In a healthy human cochlea, fluid is found in the ____

a. vestibular canal only b. vestibular and tympanic canals only c. tympanic canal only d. vestibular canal, tympanic canal, and cochlear duct e. cochlear duct only

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Osteocytes are found in the central canal of an osteon.

a. true b. false

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Which of the following is a purine base found in nucleotides?

a. uricil b. steroid c. guanine d. cytosine e. thymine

Biology & Microbiology