Cyanobacteria are thought to be the first organisms to evolve ____.
A. oxygenic photosynthesis
B. chemolithotrophy
C. aerobic respiration
D. fermentation
Ans: A. oxygenic photosynthesis
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An endergonic reaction can proceed only if it absorbs:a
randomly available free energy. b. less free energy than is released by a coupled exergonic reaction. c. more free energy than is released by a coupled exergonic reaction. d. less free energy than is released by a coupled endergonic reaction. e. the same amount of free energy that is absorbed by the enzymatic breakdown of proteins.
Which of the following statements is TRUE?
A. Once a person reaches maturity, cell division stops except to repair wounds. B. Cell division in an adult signifies cancer. C. Select cells throughout the body retain the ability to divide and replace themselves. D. Cells making up a multicellular individual are not considered to be individually “alive.” E. All cells retain the ability to divide even after the organism reaches maturity.
Which of the following are virulence factors contributing the pathogenicity of Neisseria species?
A) hemolysin B) fimbriae C) a capsule D) exotoxins E) both a capsule and fimbriae
Which of the following causes mutations by creating thymine dimers?
A. nucleotide analogs B. nitrous acid C. ultraviolet light D. benzopyrene E. gamma rays