Which of the following was not an energy source on early Earth?
A. meteorites
B. ultraviolet radiation
C. lightning
D. ozone layer
E. volcanoes
Answer: D
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A particular reaction has a negative delta G. However, this reaction takes many years to proceed in the absence of enzyme. Why is this the case?
A. This reaction does not obey the second law of thermodynamics B. This reaction does not proceed spontaneously C. The initial free energy of the reactants is much less than the final free energy of the products D. A certain amount of activation energy is required for the reaction to proceed
Chromosomal aberrations:
A. are caused by errors during meiosis. B. are typically only seen in the elderly. C. are usually fixed by DNA polymerase. D. can be caused by methylation. E. are not described by any of the answer
In estuaries,
a. temperature and salinity remain relatively constant throughout the day. b. temperature and salinity vary sharply during the day. c. temperature varies greatly but salinity remains constant. d. salinity varies greatly but temperature remains constant. e. organisms are not well adapted to wide swings in salinity.
Which of the following is responsible for causing gas gangrene?
A. Clostridium botulinum B. Clostridium tetani C. Clostridium perfringens D. Clostridium acetobutylicum