The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B?
A) spindle formation
B) spindle attachment to kinetochores
C) cell elongation during anaphase
D) cleavage furrow formation and cytokinesis
D
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A botanist is comparing the metabolic pathways for photosynthesis in cyanobacteria and in redwood trees. What do you expect she will find?
A. These two pathways will demonstrate dramatic differences. B. These pathways will utilize two very chemically different types of chlorophyll. C. These two pathways will actually be quite similar, though subtle differences may exist. D. It is impossible to compare metabolic pathways used in bacteria and eukaryotes.
Speciation:a
maintains an intermediate phenotype in a stable environment. b. is the formation of a new species from an ancestral population. c. only occurs when a population is geographically isolated. d. is a change in allele frequencies in a population. e. is the end result of macroevolution but not microevolution.
Which one of the following is found directly beneath the cells of an epithelial tissue?
A) fibrous connective tissue B) basement membrane C) collagen and elastic fibers D) bi or multipolar extensions E) muscle tissue
Which of the following processes is one of sexual reproduction?
a. fission b. fertilization c. budding d. fragmentation