The presence-absence test is a modification of which test?
A. Membrane filter
B. Virus plaque assay
C. MPN
D. None of these choices are correct.
Answer: C
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DNA molecules, regardless of size, have a net positive charge
Indicate whether the statement is true or false
Imagine you are talking to your friend who is very excited because he has just transduced his first batch of bacteria in the laboratory. What does this mean?
A. He introduced a gene of interest into his bacteria using viruses. B. He introduced a gene of interest into his bacteria using other bacterial species that can form pili. C. He introduced a gene of interest into his bacteria by lysing other bacterial cells and exposing his bacteria to this mixture. D. He produced a strain of antibiotic-resistant bacteria by exposing his bacterial cultures to antibiotics. E. Through periodic selection, he was able to isolate a gene of interest in his bacteria.
What type of vaccine is the hepatitis B vaccine?
A. inactivated whole pathogen B. attenuated vaccine C. toxoid vaccine D. a recombinant vaccine composed of a single antigen of the hepatitis virus E. a vaccine produced by treating the virus with formaldehyde
The hallmark of multicellular organisms is their ability to
A. grow and divide rapidly. B. adjust quickly to outside environment. C. maintain homeostasis. D. quickly synthesize amount and type of enzymes according to available nutrients. E. respond by gene action to oxygen availability.