Most microbes that inhabit estuaries are ________.
A. halovariable
B. halophilic
C. halophobic
D. halotolerant
Answer: D
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Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant?
A. The ability to grow at thermophilic body temperature,(37ºC) B. Surface structures for attaching to tissue C. No susceptibility to reactive oxygen species like peroxides D. The ability to use the titanium from the implant as an energy source
The organism that causes malaria is
(a) a pathogen. (b) Plasmodium vivax. (c) carried by a mosquito. (d) all of the above.
Why is the use of morphological traits to distinguish species considered to be a disadvantage?
What will be an ideal response?
To identify genes coding for essential proteins, researchers can create temperature-sensitive mutations. These mutations allow proper protein folding and cell proliferation at the permissive temperature of 22ºC, but they cause protein misfolding and reduced cell proliferation at a higher restrictive temperature, such as 37ºC. Which of the following mutations might increase protein flexibility and lead to a temperature-sensitive phenotype?
A.) mutation of a lysine (that was involved in an ionic bond with a glutamic acid) to a glycine B.) mutation of a bulky isoleucine that was buried in the protein interior to a glycine (side chain=H) C.) mutation of a alanine to a cysteine, leading to the formation of a new disulfide bond