You culture the dried soup from a 4,000-year-old cooking pot found in an Egyptian tomb and obtain a distinctive species of prokaryote. You immerse a test tube of these bacteria in boiling water for several hours, but the colony grows back. This species is probably
A) endospore-forming.
B) a spirochete.
C) halophilic.
D) a cyanobacteria.
Answer: A) endospore-forming.
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Rough endoplasmic reticulum is studded with ribosomes.
Answer the following statement true (T) or false (F)
Which of these is a heterotroph?
A. a phytoplanktonic diatom B. a moss plant C. an oak tree D. a corn plant E. a fish
Natural selection acting on a population may NOT favor
a. individuals at the left end of the range of variation. b. individuals at the right end of the range. c. extreme individuals at both ends of the range. d. the intermediate individuals within the range. e. obligate asexually reproducing organisms.
The 2007 review on climate change concluded that the warming in recent decades is attributed to ________
a. human induced increases in greenhouse gases b. increased geothermal activity c. increased water vapor in the atmosphere d. volcanic eruptions e. solar output