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.
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True or false: mutations always result in the death of the organism which acquires them
A. true B. false
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
Osteocytes are found in the central canal of an osteon.
a. true b. false
Which of the following is a purine base found in nucleotides?
a. uricil b. steroid c. guanine d. cytosine e. thymine