Most of the problems with gene therapy have been traced to ____________________. Fill in the blank(s) with the appropriate word(s)
ANS: the vectors
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Biologists around the world spend a great deal of time studying the cytoskeleton of cells
Some of the tools they use in their research include chemicals that interfere with the structure of the cytoskeletal elements or with the activities of the motor proteins that associate with the cytoskeleton to facilitate movement. For example, a family of compounds called cytochalasins disrupts the normal assembly and disassembly of microfilaments. Another compound called colchicine binds to tubulin and prevents the assembly of microtubules. The function of dynein is prevented by a compound known as EHNA (erythro-9-[3-2- (hydroxynonyl)] adenine), and blebbistatin inhibits the activity of myosin. Use this information to answer the following questions. Based on this information, where would you predict blebbistatin to have the greatest effect? A. sperm cell motility B. leading edge formation of a migrating fibroblast C. the contraction at the trailing edge of a fibroblast D. Blebbistatin would likely have no effect on any of these examples of cell movement.
Species richness and the relative abundance of each species determine ____
a. the species composition of an ecosystem b. the species diversity of a community
c. the species composition of a population d. the species diversity of the biosphere e. the species diversity in a niche
Pressure
What will be an ideal response?
Cell size is limited because _________ is critical to a cell's function
A) the size of the nucleus B) the ability to photosynthesize C) the number of microvilli D) surface-area-to-volume ratio E) cilia movement