Gingivitis
A. is primarily caused by normal anaerobic biota.
B. may involve archaeal species.
C. involves the formation of calculus and plaque.
D. involves a crevice in the gum along the tooth.
E. All of the choices are correct.
Answer: E
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Use the following study to answer the following question(s): A current trend among professional baseball players is to wear braided titanium necklaces. The titanium reportedly regulates the flow of energy through the body. The player wearing the necklace then shows improved strength, tires less, and recovers more quickly.Which of the following would be the strongest evidence for or against the necklace's effectiveness?
A. A bar graph illustrating the satisfaction levels of the players who wear the necklace B. A bar graph comparing batting averages of the players who wear the official titanium necklace and those who were unknowingly wearing a fake titanium necklace C. A bar graph comparing the percentage of players who wear the necklace with the percentage of players who do not wear the necklace D. A scatter plot showing days on the disabled list and percentage of players who do or do not wear the necklace
Isothermal amplification techniques, such as NASBA, utilize a single temperature for nucleic acid amplification thereby eliminating the need for thermal cycling instruments to precisely and quickly alter the reaction temperature. This often reduces the cost associated with molecular testing and infrastructure requirements. In what settings could this be advantageous?
a. Developing countries with limited health care facilities b. Field clinics during military operations c. Small clinics or hospitals without centra-lized laboratory facilities d. Urgent care clinics or pharmacies for point-of-care diagnosis e. All of the above
Which class of antibodies has four constant domains per heavy chain?
a. IgA b. IgG c. IgE d. IgD
Which of the following is NOT true of asexual
reproduction? a. It is more suitable for reproduction in animals in stable environments. b. It results in offspring that are identical to each other. c. It promotes genetic variation in successive generations. d. Fission is a type of asexual reproduction. e. The offspring are essentially genetically identical to the parents.