Which one of the following terms applies to the phylum Bryozoa?
A. radial symmetry
B. lophophore
C. Parazoa
D. deuterostome
E. radial cleavage
B. lophophore
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Which of the following events involves the release of enzymes?
A. cell cleavage B. cortical reaction C. egg membrane depolarization D. increase in cytosolic calcium within the egg E. the fusion of egg and sperm nuclei
Approximately what percentage of new drugs produced via pharmaceutical research is derived from natural compounds?
a. 75% b. 50% c. 35% d. 10%
During mitosis and meiosis, DNA is duplicated, chromosomes separate, and cytoplasm divides. How are mitosis and meiosis different?
A) Meiosis occurs only in plant cells as mitosis occurs only in animal cells. B) Meiosis creates diploid daughter cells and mitosis creates haploid cells. C) Meiosis only occurs in zygotes after fertilization and mitosis occurs only in the embryo. D) Meiosis creates haploid daughter cells and mitosis creates diploid cells.
The prevalence of a particular disease refers to:
A) the frequency with which the disease occurs. B) how acutely the disease negatively affects a person. C) the number of cases in a particular population over time. D) the number of deaths from the disease in a given population.