Most sulfur-oxidizing bacteria are obligate
a. aerobes.
b. anaerobes.
c. phototrophs.
d. nitrate reducers.
Answer: A
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The energy to form the new bond when a nucleotide is added to a growing DNA strand is provided
primarily by ____.
a. unwinding of the DNA double helix b. hydrolysis of pyrophosphate c. breaking hydrogen bonds between base pairs d. DNA polymerase e. forming hydrogen bonds between base pairs
Studies show that the worldwide age for onset of puberty, particularly early breast development, has begun earlier each decade. In fact, between 1991 and 2006, the age for onset of breast development in girls adjusted by a full year (from a mean age of 10.9 to 9.9). While several theories have emerged about what is causing the earlier presence of female sex characteristics, one prominent theory is that it is due to ubiquitous early exposure to hormones in food products from the agricultural industry. If you were a researcher in this field, which of the following hormones would you look for in food?
a. testosterone b. LH c. estrogen d. FSH
What was the greatest contributing factor to the dodo bird extinction on the island of Mauritius?
a. sailors overharvested them for food b. rats, cats, and pigs introduced by sailors c. climate change caused by humans d. their predators went extinct e. rising sea levels made the island smaller
The anaerobic environment of swamps and marshes is an excellent habitat for methanogens.
a. true b. false