The specimen preparation technique that is best for viewing cell motility is the ________.
A. hanging drop
B. negative stain
C. Gram stain
D. fixed, stained smear
E. flagellar stain
Answer: A
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After a fragment of DNA containing the gene of interest has been inserted into a vector, how are the gaps between the two pieces of DNA sealed together?
A. DNA polymerase catalyzes the formation of hydrogen bonds in the DNA backbone. B. DNA gyrase creates tension in the DNA backbone to hold the molecule together. C. DNA helicase causes the double helix to wind into its stable form. D. DNA ligase catalyzes the formation of covalent bonds in the DNA backbone. E. Restriction enzymes have the ability to join the two DNA fragments.
Atmospheric CO2 was stable until
a. 10,000 years ago. b. World War I. c. World War II. d. the Industrial Revolution. e. 15 million years ago.
Retroviruses and bacteria such as Agrobacterium tumefaciens are commonly used to produce
A) genetically identical clones of an organism. B) yeast hybrid systems. C) polyclonal and monoclonal antibodies. D) transgenic organisms. E) monoclonal antibodies.
Bacterial endospores and fungal endospores are the same thing.
a. true b. false