The Cl- ion has a single negative charge and the atomic number of 17. How many electrons are on its innermost shell?
A) 18
B) 17
C) 9
D) 2
D
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Plasmid cloning vectors generally contain genes for which two traits?
a. lacZ production and ampicillin resistance b. ?-galactosidase enzyme production and ampicillin resistance c. DNA ligase production and sticky ends d. DNA ligase and reverse transcriptase production e. DNA polymerase production and antibiotic resistance
Skill memories
a. are created when one consciously repeats an activity many times. b. involve the amygdala. c. involve the hippocampus. d. involve the corpus striatum. e. are created when one consciously repeats an activity many times and involve the cerebellum.
The portion of an enzyme where the substrate binds is known as the ____
a. receptor site b. active site c. target receptor d. target site e. contact site
What is the correct sequence of the reagents in the Gram stain technique?
a. safranin, crystal violet, alcohol, iodine b. alcohol, iodine, crystal violet, safranin c. crystal violet, iodine, alcohol, safranin d. iodine, alcohol, safranin, crystal violet