Sexual reproduction in humans is an example of DNA recombination
Indicate whether the statement is true or false
TRUE
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Four of the five answers listed below describe human characteristics. Select the exception
a. development b. direction by DNA c. response to change d. ability to produce nutrition e. maintenance of internal environment
Alon claimed that a tincutre of a local herb was effective in lowering anxiety and was planning to invest in the product. As evidence of his claim, Alon, who had anxiety over his financial situation, said that he felt much better after the treatemt, was much more relaxed, and no longer worried about his finances. Which of the following combinations of methodological flaws BEST characterizes Alon's investigation?
a) lack of an appropriate outcome measure b) lack of appropriate controls and lack of an appropriate outcome measure c) lack of randomization, lack of replication, and lack of an appropriate outcome measure d) lack of replication and lack of appropriate controls e) lack of an appropriate outcome measure, replication, randomization, and controls
Davis, Weintraub, and Lasser found three genes that are involved in muscle differentiation by
A. mutating genes expressed only in muscle cells to see if differentiation could be prevented. B. cloning all the genes that were expressed only in muscle cell lines to determine if any of these genes could cause non-muscle cells to differentiate into muscle cells. C. eliminating all the gene candidates that were expressed in both muscle and nonmuscle cells. D. finding all the genes that were expressed in common between two different muscle cell lines.
Human skin cells and human white blood cells of the immune system both perform protective functions. Skin cells function primarily in external physical protection, whereas white blood cells function primarily in internal protection. Nonetheless, both
types of cells contain a complete copy of the human genome. Explain how cells can have the same genetic information and yet perform different functions. What prevents skin cells from making all the same proteins of a white blood cell? What will be an ideal response?