What is the purpose of a selectable marker such as the antibiotic-resistance gene ampR?
A. Selectable markers allow a researcher to identify cells that have incorporated the recombinant plasmid.
B. Selectable markers produce antibiotics, which kill cells that have not incorporated recombinant plasmid.
C. Selectable markers prevent cells that have incorporated one plasmid from incorporating another.
D. Selectable markers allow a researcher to identify the recombinant plasmid.
E. Selectable markers are only effective in viral vectors.
A. Selectable markers allow a researcher to identify cells that have incorporated the recombinant plasmid.
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The pH of the medium has no effect on the activity of the disinfectant being applied
Indicate whether the statement is true or false
Which of the following was the most likely
food source for first terrestrial tetrapods?
a. leaves b. insects c. small mammals d. worms e. eggs
Which of the following is characteristic of gymnosperms?
a. The gametophyte generation is dominant. b. They are wind pollinated. c. They are more diverse than the angiosperms. d. They are water pollinated. e. All of the above are correct.
What type of bonding is likely to occur between two water molecules or strands of DNA?
A. covalent B. hydrogen C. both hydrogen and covalent D. ionic E. both hydrogen and ionic