Humic acids are difficult to degrade, and therefore they usually remain in a system for several decades
Indicate whether the statement is true or false.
Answer: FALSE
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Why is it that the tongue and cheek epithelium doesn't provide a sufficient anaerobic environment for plaque anaerobes to grow, but the surface of teeth might?
A. The epithelium is supplied with oxygen by capillary beds. This makes it a relatively aerobic environment and hostile to anaerobes. B. The tooth enamel is supplied with oxygen by capillary beds. This makes it a relatively anaerobic environment and hostile to aerobes. C. The surface of the tongue and cheek are constantly scraped by the action of consuming food. Layers of bacterial growth that might help to supply an anaerobic environment are scraped away, exposing lower levels to oxygen-rich air. D. The surface of teeth (especially the molars) have many pits and crevices that can serve as 'pockets' for layers of bacteria to grow in. Once the layers get deep enough, the bottom portions are anaerobic. This isn't possible on the very smooth surface of the tongue and cheek epithelium.
Which hypothesis states that new species are prevented from entering a community by the existing
species?
a. equilibrium theory of island biogeography b. facilitation hypothesis c. inhibition hypothesis d. intermediate hypothesis e. tolerance hypothesis
A particular chemical reaction is exergonic. What can you say about the relationship between the reactants and the products in this exergonic reaction?
A. The reactants cannot spontaneously react to generate the products B. The reactants likely have lower enthalpy than the products C. The reactants have more free energy than the products D. The reactants are likely more disordered and the products are likely more ordered
Which level of protein structure can involve hydrogen bonds?
A) primary B) secondary C) tertiary D) primary and secondary E) secondary and tertiary