Which of the following features is not shared by microtubule and microfilament molecular motors?
A) coupling ATP hydrolysis to change shape and attachment of the motor to its associated cytoskeletal filament
B) retention of bound ADP and Pi products immediately after ATP hydrolysis
C) cycles of ATP hydrolysis, release of ADP and Pi, and binding of new ATP as they undergo a crossbridge cycle of force production on a filament
D) similar structural features that transduce changes in the motor protein shape into movement
E) The motors share all these features.
Answer: E
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The gene encoding apolipoprotein B exists in two isoforms, APOB100 and APOB48. These two forms are produced as a result of
A. tissue-specific expression. B. a gene mutation that results in a stop codon. C. RNA editing. D. alternative splicing.
Which statement is true?
a. Only diploid plant stages are free-living. b. All spores are clones of their parent cells. c. Most plant and fungi spores are haploid. d. Gametophytes are larger than sporophytes.
Nonspecific chemical defenses include
A. stomach hydrochloric acid. B. lactic acid and electrolytes of sweat. C. the skin's acidic pH and fatty acids. D. lysozyme. E. All of the choices are correct.
Clayton and colleagues (2003 ) examined the frequency of host shifts observed among both wing feather and body lice that infect doves
They observed that body lice rarely shift host species, whereas wing feather lice often shift from one species to another. The higher frequency of host shifts observed in wing feather lice is due to the observation that ________. A) wing feathers containing lice molt frequently, and are frequently used by other hosts to build nests B) body feathers do not come into contact with other hosts as frequently as wing feathers C) the lice that infect wing feathers often move from host to host on a parasitic fly D) doves preen each other's wing feathers at a higher frequency than body feathers