The hydrolysis of GTP to GDP carried out by tubulin molecules ________________
(a) provides the energy needed for tubulin to polymerize.
(b) occurs because the pool of free GDP has run out.
(c) tips the balance in favor of microtubule assembly.
(d) allows the behavior of microtubules called dynamic instability.
(d) The hydrolysis of GTP to GDP occurs after a GTP-bound tubulin molecule is incorporated into a microtubule, and it makes the microtubule more susceptible to disassembly. It is the resulting switch in microtubule stability that gives rise to the phenomenon known as dynamic instability.
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Ectothermic animals regulate their body temperature by ____
a. adjusting their metabolism b. relying on insulation such as feathers c. growing hair d. foraging for food e. altering their position
Do humans exhibit r-selected or K-selected species patterns? Explain your answer. What will be an ideal response?
The virulence factor associated with enterohemorrhagic Escherichia coli diarrhea resembles a virulence factor from which of the following bacteria?
A. Enterobacter aerogenes B. Klebsiella pneumoniae C. Salmonella typhi D. Shigella sonnei E. Vibrio cholera
Acyclovir is an antiviral chemical that resembles a nucleotide but lacks a 3' OH group and cannot form phosphodiester bonds. Why is acyclovir useful in treating some viral infections?
A. Acyclovir blocks the assembly of viral cell capsules. B. Acyclovir halts viral DNA replication. C. Acyclovir hydrolyzes viral polysaccharides. D. Acyclovir stops viral protein synthesis.