In the 1920s, Muller discovered that X-rays caused mutation in Drosophila. In a related series of experiments in the 1940s, Charlotte Auerbach discovered that chemicals-she used nitrogen mustards-have a similar effect. A new chemical food additive is developed by a cereal manufacturer. Why do we test for its ability to induce mutation?
A. We want to make sure that it does not emit radiation.
B. We worry about its ability to cause infection.
C. We want to prevent any increase in mutation frequency.
D. We want to be sure that it increases the rate of mutation sufficiently.
E. We worry that it might cause mutation in cereal grain plants.
Ans: C. We want to prevent any increase in mutation frequency.
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V-________ and t-________ mediate final docking between target and vesicle.
Fill in the blank(s) with the appropriate word(s).
Four of the following are true about the amoebozoans. Which one is the exception?
a. They are shape shifters. b. They include the amoebas. c. They are the closest known relatives of animals. d. They include species that are able to form pseudopods. e. They include the slime molds.
Refer to the study by Poulsen et al. and the figure above. Cultures of a species of diatom were treated with BDM, a reversible inhibitor of myosin function
Which of the following predictions is consistent with the hypothesis that an actin-myosin interaction is necessary for motility? A) BDM will significantly decrease motility of the cells in culture. B) BDM will not significantly alter motility of the cells in culture. C) BDM will significantly increase motility of the cells in culture.
Answer the following statements true (T) or false (F)
1. You would expect to find more mitochondria in glycolytic muscle fibers than in oxidative muscle fibers. 2. When a person "works out" with weights, their muscles typically grow. This growth is due to increases in the number of myofibrils within their muscle fibers. 3. When Ron Evans generated transgenic mice in which the gene PPAR-delta was constituitively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. Based on this, you would also predict faster sprint speeds in the transgenic mice. 4. Muscles that extend a limb at a joint are termed "extensors."