In the 1950s, christian anfinsen demonstrated the renaturation of the protein ribonuclease (rnase) in vitro. after reduction and the addition of urea, the protein was in an unfolded state. after removing the urea and then the reducing agent, the protein oxidized and refolded, with greater than 90% activity. if reducing agent removal occurs before removing the urea, the protein showed less than 5% activity. why does synthetically produced rnase refold incorrectly if the reducing agent is removed before urea removal?

What is the broadest level of classification of life

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

What type of competition exsist between two species. turtles and fish