Enzyme regulation may occur by several methods. Which of the following is not a means of enzyme regulation?
A) substrate-level phosphorylation
B) feedback inhibition
C) allosteric regulation
D) covalent modification
E) saturation
E) saturation
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Conservationists have identified 25 areas worldwide as hotspots. This means these areas
A. are currently being preserved. B. have serious pollution problems and are being targeted for cleanup. C. have high numbers of endemic species, and those numbers are increasing. D. have high numbers of endemic species, and those numbers are decreasing. E. have the highest numbers of invasive species worldwide.
Which of the following is included as part of the Eubacteria?
A) methanogens B) thermacidophiles C) cyanobacteria D) halobacteria E) sulfobacteria
Answer the following statements true (T) or false (F)
1. Research suggests a link between a mutation in the skin protein filaggrin and allergic reaction. 2. Vaccinating a substantial portion of the population against an infectious disease establishes "herd immunity." 3. Mitosis in a cancer cell can be compared to a runaway train that is racing along without signals and control points. 4. Invasive malignant tumors typically contain mutations that affect the cytoskeleton and allow the cell to move from where it is anchored. 5. Research has shown that a "cocktail" of several drugs, each acting on a different cellular pathway, is the best approach to treat many cancers.
Bacteria metabolize sugars and they create ________ that can eat away at the ________ to cause dental caries
A) toxins; dentin B) chemicals; pulp C) proteins; pulp D) spores; gums E) acids; enamel