Which product of anoxic sewage treatment can be used to heat and power an entire water treatment facility?
A) CO2
B) H2
C) CH4
D) O2
Answer: C
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________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.
A. Induction B. Attenuation C. Catabolite repression D. All of the choices are correct.
Where would you expect to find the plus-end of a microfilament in a crawling cell?
A. near the plasma membrane of the leading edge of the cell B. near the plasma membrane of the trailing end of the cell C. near the cell center D. Answers a and b are both correct.
A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere. What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?
A. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes. B. The younger rocks will have higher levels of carbon dioxide, because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste. C. The ratio of carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. D. The amount of carbon will vary unpredictably in the younger rocks, because rock weathering added carbon dioxide to the atmosphere, and volcanic activity sequestered it.
Cartilaginous fishes retain __________ in their body,
so they do not lose or gain water by osmosis. Fill in the blank(s) with the appropriate word(s).