You want to experiment with microbial growth in various nutrients, so you inoculate a loopful of E. coli into a tube of honey. Which statement best describes what you expect to happen and why?
A. E. coli grows well in the honey because fructose is a good carbon source.
B. E. coli do not grow because there is only sugar in the honey and no other nutrients.
C. E. coli will not grow because the excessive sugar is toxic.
D. E. coli does not grow because it has been dehydrated by the honey.
Answer: D
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a. plasma membrane of the cell b. inner mitochondrial membrane
c. outer mitochondrial membrane d. nuclear membrane e. lysosomal membrane
In muscle contraction, which of the following
triggers the power stroke?
a. release of Pi from the myosin head b. binding of ATP to the myosin head c. hydrolysis of ATP into ADP and Pi d. cross-bridge formation between actin and myosin e. relaxation of the sarcomere
By which one of the following methods is a stronger stimulus coded by neurons differently from a weaker stimulus?
A) A stronger stimulus results in greater depolarization. B) A stronger stimulus results in more action potentials/unit time. C) A stronger stimulus results in faster traveling action potentials. D) A stronger stimulus results in hyperpolarization of the neuron. E) A stronger stimulus results in prolonged influx of Na+ ions and a delay before repolarization.
lacI codes for a(n) ________, and when lacI is mutated, the lac operon is ________
A) structural gene; never expressed B) repressor; constitutively expressed C) repressor; never expressed D) activator; never expressed E) activator; constitutively expressed