Phorid flies are being used to combat the invasive red imported fire ants. How do phorid flies kill the ants?
a. They are predators of the ants.
b. They produce a poison in their lining which kills the ants when eaten.
c. They are parasitoids who lay their eggs in the ants body.
d. They compete with the ants for food sources.
e. They kill ant eggs.
c
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
Archaeal cell walls
A. are disrupted by treatment with lysozyme or penicillin. B. include orthomureine. C. are similar to those of Gram-negative bacteria. D. lack murein and D-amino acids.
Four of the five answers listed below are
intimately related to enzyme properties. Which of the following is least related?
a. cofactors b. active sites c. activation energy d. substrate e. catalyst
)
A. These infections commonly occur in healthy individuals. B. E coli that causes UTIs is an example of a common opportunistic pathogen. C. Very young and very old patients are most susceptible to opportunistic infections. D. The presence of other pathogens in a patient has no effect on the development of opportunistic infections. E. Cancer patients are at a higher risk for opportunistic infections.