Organisms that live in an aquatic environment get their carbon from calcium carbonate shells on the bottom, instead of from carbon dioxide in the environment.
Answer the following statement true (T) or false (F)
False
Both terrestrial and aquatic organisms get their carbon from carbon dioxide in the environment.
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What is the first step during transcription initiation in prokaryotes?
A. the transcription bubble is formed B. RNA polymerase binds to the promoter C. the DNA double helix is unwound D. RNA polymerase synthesizes a short primer E. transcription factors bind to the TATA box sequence
Freezing oocytes has not been as successful as freezing sperm because
A) they undergo an extra meiosis. B) the woman can become dangerously cold. C) ice crystals can form in the abundant, watery cytoplasm. D) the nuclei shatter.
Plate tectonic theory is based on
a. a thermal convection model in which cool material in the earth’s mantle rises and spreads laterally beneath the crustal plates. b. the idea that the earth’s crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates. c. the idea that coacervate formation causes continents to drift apart slowly on their crustal plates. d. observations that the sea floor is slowly spreading away from oceanic ridges due to thermal convection in the mantle. e. all of these.
The bacterium Staphylococcus aureus is commonly found in the nasal cavity of healthy people. If inhaled into the lungs, however, it may cause pneumonia. Staphylococcus aureus is best described as
A) a parasite. B) resident microbiota. C) a mutualist symbiotic partner. D) transient microbiota. E) both resident microbiota and opportunistic pathogen.