Which of the following drugs blocks the assembly of actin filaments?
a. Colchicine
b. Cytochalasin
c. Phalloidin
d. Taxol
e. Both b and c
Answer: b. Cytochalasin
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The first generation of replication in the Meselson and Stahl experiment disproved which theory of replication?
A. Semiconservative B. Conservative C. Dispersive D. None—it took more than one generation to disprove the theory
Which of the following is not a characteristic of amphibians?
A. They are ectothermic. B. They do not have an amnion. C. They have a three-chambered heart. D. They have vertebrae. E. They have a cartilaginous skeleton.
In a certain population, the allele causing sickle cell anemia has an allele frequency of 0.2. If the population is in
genetic equilibrium for this allele, what fraction of the population would be carriers for the allele (heterozygous individuals)? a. 0.24 b. 0.32 c. 0.42 d. 0.48 e. 0.80
Structural features that serve the same function in completely unrelated organisms are said to be ________ structures
Fill in the blank(s) with correct word