If you place the corner of a paper towel into a droplet of water the water moves across the paper towel. Which of the following would explain the movement of the water?
A. surface tension
B. cohesion
C. adhesion
D. both cohesion and adhesion
both cohesion and adhesion
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Which of the following is NOT true of the nuclear envelope?
a. single lipid bilayer b. continuous with endoplasmic reticulum c. possesses pores d. controls passage into and out of nucleus e. separates DNA from cytoplasm
AZT is an effective drug for treating HIV-infected individuals because it prevents the replication of new viral particles. The HIV virus has a genome made of RNA. Of the following, which represents the most likely target for the action of AZT?
A) DNA in the host cell B) cell wall of the virus C) reverse transcriptase in the virus D) DNA ligase in the host cell
Fitness is a measure of reproductive success. If an individual with genotype BB produces 6 offspring, and a heterozygous individual (Bb) produces 10 offspring, and a third individual with genotype bb produces 5 offspring, what is the fitness value for the individual with BB genotype?
A. 1.0. B. 0.5. C. 0.6. D. 0.4. E. 1.1
Tubulin may assemble onto one end while disassembling from the other end of the same microtubule simultaneously in a process known as
A) dynamic instability. B) treadmilling. C) nucleation. D) oligomerization. E) catastrophe-rescue.