Arp2/3-dependent actin polymerization directly drives which of the following activities at the leading edge of crawling cells?
A) filament rearward translocation
B) lamellipodia protrusion
C) new adhesion formation
D) generation of tension
E) focal adhesion detachment
Answer: B
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The absence of sweat glands in cetaceans aids in
a. maintaining body heat. b. conserving water. c. increasing internal salinity. d. reducing drag. e. swimming efficiency.
What description applies to the term consilience, which is demonstrated by the evidence for the theory of common descent?
A) The supporting evidence for the theory is derived from different sources. B) The evidence is able to convince even nonscientists who have doubts about the theory. C) Not enough evidence has been gathered to support the theory. D) The theory can never be challenged by new evidence.
All of the following pea plant feature were favorable to the success of Mendel's experiments, except
A. true-breeding varieties were available. B. the plant can self-fertilize. C. the plant can be cross-fertilized. D. plant fertilization could be controlled artificially. E. the short life cycle of the pea plant.
Why did the researchers perform sequencing at multiple time points on some patients?
A. Sequences taken at multiple time points enabled scientists to assess whether the patient's immune system was successfully combatting the virus B. Sequences taken at multiple time points were mistaken made by the researchers where samples were taken independently by two different researchers C. Sequences taken at multiple time points enabled scientists to assess how the virus was evolving within a patient over time. D. Sequences taken at multiple time points were experimental controls (technical replicates designed to verify the accuracy of the sequencing procedure