Define stem cells and briefly discuss stem cell research and its potential for use in treating disease. What will be an ideal response?
ANSWER: In the embryo, stem cells divide to form about 200 different cell types that become parts of
the tissues and organs of the body. In adults, stem cells are a reservoir that provides
replacements for cells lost through injury, disease, or wear and tear. The ability to isolate
stem cells from embryos and to produce stem cells from normal body cells in the laboratory
offers the possibility of using stem cells to treat disorders such as heart disease, diabetes, and other degenerative conditions
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Describe three adaptations that enhance the function of a respiratory surface
What will be an ideal response?
Which of the stages or structures in Figure 51-1 was formed by the process of gastrulation?
a. 1 b. f c. g d. 3 e. 5
Unlike animal cells, plant cells have ________ and ________. Unlike plant cells, animal cells have ________
A) chloroplasts; cell walls; centrioles B) centrioles; chloroplasts; cell walls C) chloroplasts; cell walls; a nucleus D) centrioles; cell walls; large central vacuoles
Which of the following provides the best evidence that modern humans are evolving?
A. In humans of northern European descent, blue-eyed individuals are at greater risk of vitamin D deficiency than brown-eyed individuals. B. Adult humans of American descent eat fruits and vegetables grown all over the world. C. Adult humans of northern European descent can readily digest lactose. D. Modern humans have opposable thumbs.