With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms
Indicate whether the statement is true or false
TRUE
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Most of the bacteria involved in periodontal disease are obligate (strict) anaerobes. Explain why this is the case.
A. Mouthwashes and toothpaste destroy most of the strict aerobes that are found on teeth. B. Sugar and other carbohydrates used by the oral bacteria can be more easily consumed anaerobically. C. The oral cavity is a low oxygen environment. D. The crevice between the gingiva and the tooth is low in oxygen.
The current rapid loss of species is considered by many scientists to be another mass extinction. What may be causing this increase in extinction rate, beyond background extinction?
A) a recent increase in earthquakes worldwide B) human population growth and the resulting habitat changes worldwide C) global climate change D) changes in the number of solar flares observed recently
Roots that arise from branches or vertical stems, and that are used to support a plant in an upright position, are referred
to as: a. prop roots. b. contractile roots. c. pneumatophores. d. lateral roots. e. tap roots.
Cri-du-chat syndrome is caused by a deletion on chromosome 5; deletions occur when _____.
A) a portion of a chromosome is relocated onto a second chromosome B) homologous chromosomes fail to separate during meiosis C) a portion from the end or within the middle is lost D) a son inherits a defective X chromosome from his mother E) a section of chromosome breaks free but is reconnected to its chromosome in reverse order