Why are some xenobiotics biodegraded slower than crude oil and petroleum products?
A) Xenobiotics were designed to inhibit microbial growth.
B) Some xenobiotics are novel compounds that differ from naturally occurring chemicals, thus microorganisms have not yet evolved to effectively degrade them.
C) Only cometabolic microbial processes degrade xenobiotics.
D) Chlorinated compounds are so toxic that biodegradation is not possible.
Answer: B
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Which of the following describes a disadvantage of nuclear energy, especially compared to other alternative energy sources?
A. Nuclear energy does not actually produce much energy. B. Nuclear energy is not always safe because of the radioactivity involved. C. Nuclear energy is not feasible on a large scale and tends to be more efficient for powering individual homes. D. Nuclear energy releases large amounts of carbon dioxide into the atmosphere.
A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?
A. Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells. B. Enzymes in the cell catalyze the breakdown of glucose. C. Living cells make the water warmer, speeding up the reaction. D. Cells use energy to break down glucose. E. The water is activated by the presence of living cells. F. Glucose becomes more chemically reactive inside a cell.
Very high hematocrit is risky because of increased blood ___
Fill in the blank(s) with the appropriate word(s).
Why is the symbiotic relationship of truffle mushrooms and tree roots considered to be crucial to the colonization of land?
A) This relationship is found in some of the oldest plant fossils. B) Truffles have the terrestrial adaptation of seeds. C) Tree roots can be found only in terrestrial environments. D) Truffles provide trees with sugars.