Guanine tetraphosphate (ppGpp) is particularly associated with which process?
A. Quorum sensing in Vibrio
B. Chemiosmosis in Paracoccus
C. Spore formation in Bacillus
D. Stringent response in Escherichia
Answer: D
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According to the acid-growth hypothesis, auxin works by _____
A) dissolving sieve plates, permitting more rapid transport of nutrients B) dissolving the cell membranes temporarily, permitting cells that were on the verge of dividing to divide more rapidly C) changing the pH within the cell, permitting the electron transport chain to operate more efficiently D) increasing wall plasticity and allowing the affected cell walls to elongate E) greatly increasing the rate of deposition of cell wall material
An acoelomate is an animal that
A. has a coelom. B. has a pseudocoelom. C. has both a coelom and a pseudocoelom. D. has neither a coelom nor a pseudocoelom. E. has a coelom during early development but later loses it.
Phrenology and craniometry are no longer considered valid methods of studying intelligence. Indicate whether the statement is true or false
Industrial fermentation and fermentation in food production
A. are both processes in which sugars are oxidized to alcohols or acids. B. are processes in which sugar or protein is oxidized to produce alcohols or acids. C. use entirely different microorganisms. D. use entirely different starting material. E. make use of the same microorganisms.