Which of the following steps in cell crawling is accompanied by Arp2/3-dependent actin polymerization at the leading edge?
A) initiation
B) protrusion
C) attachment
D) contractile activities
E) both choices A and D
B) protrusion
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Briefly describe the ecological importance of coastal seas
What will be an ideal response?
Most flowering plants maximize their ability to take up nutrients by taking part in mutualisms with fungi. These
mutualisms are called ____.
a. root nodules b. Rhizobium c. mycorrhizae d. legumes e. endodermal associations
The reason that approximately one-third of adults in the United States will suffer significant hearing
loss by age 65 is most likely a. frequent infections. b. inborn structural problems. c. head trauma. d. excessive noise. e. unknown causes.
A black Angus bull named Charlie is heterozygous (Bb) for coat color (B = black and b = brown). Charlie's black coat color is his
A) genotype. B) heterozygous state. C) gene conversion state. D) phenotype. E) homozygous state.