Davis, Weintraub, and Lasser found three genes that are involved in muscle differentiation by
A. eliminating all the gene candidates that were expressed in both muscle and nonmuscle cells.
B. finding all the genes that were expressed in common between two different muscle cell lines.
C. 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.
D. mutating genes expressed only in muscle cells to see if differentiation could be prevented.
C. 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.
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What information is used to calculate the age-specific fertility rate, mx?
A. net reproductive rate B. total number of offspring born to females of reproductive age C. per capita growth rate D. proportion of female offspring born to females of reproductive age E. age at first reproduction
Which of the following is NOT a function of
some leukocytes? a. engulf and destroy damaged or dead cells b. engulf anything recognized as foreign c. call up specific immune responses d. carry out specific immune responses e. secrete substances that initiate blood clotting
A small founder population of turtles has established a population on an island with a varied and good habitat that contains ample food. There is very little competition between members
What effect would this low level of competition have on evolution? A) The population will remain very stable in size, and it won't evolve much. B) The population will grow in size but won't change much. C) The population will grow in size, and many variants will coexist. D) Genetic drift will eliminate most of the population.
A significant event influencing the rapid evolution of plants on land after their initial appearance was the ____.
A. increase of atmospheric oxygen B. reduction of ultraviolet radiation penetration through the atmosphere C. stabilization of global climates D. increase in soil nutrients E. merging of land masses