Meristic traits are characterized by having phenotypes that are described by ________
A) whole numbers
B) irrational numbers
C) imaginary numbers
D) complex numbers
E) prime numbers
Answer: A
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According to Figure 13.8, which one of the following accurately lists the taxonomic groups in order of increasing genome size (i.e., from smallest to largest)?
A. salamanders, mammals, teleosts, bacteria B. teleosts, bacteria, salamanders, mammals C. bacteria, teleosts, salamanders, mammals D. bacteria, teleosts, mammals, salamanders E. None of the answer options is correct.
What environmental change likely influenced the evolution of bipedalism in humans?
A. Trees grew taller, making it necessary to reach higher to pick fruit. B. Warming of the Earth made it an advantage to get the heat-sensitive brain higher above a hot substrate. C. Evolution of fleeter predators, making it necessary to use the hands to fight them off, rather than try to outrun them. D. The Earth cooled and there was a resultant change from a forested to a grassy landscape. E. Evolution of longer hind limbs made quadrupedal locomotion less effective.
The activation of the secondary immune response begins with which of the following?
a. Antibodies b. Killer T-cells c. Memory cells d. Mast cells e. Suppressor T-cells
Cytochalasin is a drug that caps actin filament plus ends, thus preventing actin polymerization. Phalloidin is a drug that binds to and stabilizes actin filaments, preventing actin depolymerization
Even though these drugs have opposite effects on actin polymerization, the addition of either of these drugs instantaneously freezes the cell movements that depends on actin filaments. Explain why drugs that have opposite effects on actin filaments can have a similar effect on cell movements.